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-rw-r--r--tests/arc/t16458.nim6
-rw-r--r--tests/arc/t16558.nim9
-rw-r--r--tests/arc/t17812.nim41
-rw-r--r--tests/arc/t18645.nim18
-rw-r--r--tests/arc/t18971.nim10
-rw-r--r--tests/arc/t18977.nim26
-rw-r--r--tests/arc/t19231.nim18
-rw-r--r--tests/arc/t19364.nim30
-rw-r--r--tests/arc/t19401.nim32
-rw-r--r--tests/arc/t19402.nim32
-rw-r--r--tests/arc/t19435.nim29
-rw-r--r--tests/arc/t19457.nim16
-rw-r--r--tests/arc/t19862.nim15
-rw-r--r--tests/arc/t20456.nim7
-rw-r--r--tests/arc/t20588.nim25
-rw-r--r--tests/arc/t21184.nim77
-rw-r--r--tests/arc/t22218.nim25
-rw-r--r--tests/arc/t22237.nim55
-rw-r--r--tests/arc/t22478.nim46
-rw-r--r--tests/arc/t22787.nim37
-rw-r--r--tests/arc/t23247.nim52
-rw-r--r--tests/arc/t9650.nim87
-rw-r--r--tests/arc/taliased_reassign.nim41
-rw-r--r--tests/arc/tarc_macro.nim57
-rw-r--r--tests/arc/tarc_orc.nim186
-rw-r--r--tests/arc/tarcmisc.nim454
-rw-r--r--tests/arc/tasyncawait.nim2
-rw-r--r--tests/arc/tasyncleak.nim2
-rw-r--r--tests/arc/tcaseobj.nim140
-rw-r--r--tests/arc/tcaseobjcopy.nim23
-rw-r--r--tests/arc/tcomputedgoto.nim15
-rw-r--r--tests/arc/tcomputedgotocopy.nim11
-rw-r--r--tests/arc/tconst_to_sink.nim3
-rw-r--r--tests/arc/tcontrolflow.nim2
-rw-r--r--tests/arc/tcursor_field_obj_constr.nim44
-rw-r--r--tests/arc/tcursorloop.nim45
-rw-r--r--tests/arc/tcustomtrace.nim240
-rw-r--r--tests/arc/tdup.nim71
-rw-r--r--tests/arc/texplicit_sink.nim29
-rw-r--r--tests/arc/tfuncobj.nim38
-rw-r--r--tests/arc/thamming_orc.nim155
-rw-r--r--tests/arc/thard_alignment.nim6
-rw-r--r--tests/arc/titeration_doesnt_copy.nim67
-rw-r--r--tests/arc/tkeys_lent.nim17
-rw-r--r--tests/arc/tmalloc.nim16
-rw-r--r--tests/arc/tmove_regression.nim22
-rw-r--r--tests/arc/tmovebug.nim77
-rw-r--r--tests/arc/tmovebugcopy.nim4
-rw-r--r--tests/arc/tnewseq_legacy.nim13
-rw-r--r--tests/arc/topenarray.nim86
-rw-r--r--tests/arc/topt_cursor.nim2
-rw-r--r--tests/arc/topt_no_cursor.nim173
-rw-r--r--tests/arc/topt_refcursors.nim43
-rw-r--r--tests/arc/topt_wasmoved_destroy_pairs.nim14
-rw-r--r--tests/arc/torcmisc.nim32
-rw-r--r--tests/arc/tref_cast_error.nim2
-rw-r--r--tests/arc/trepr.nim8
-rw-r--r--tests/arc/tshared_ptr_crash.nim67
-rw-r--r--tests/arc/tstringliteral.nim17
-rw-r--r--tests/arc/tunref_cycle.nim26
-rw-r--r--tests/arc/tweave.nim3
-rw-r--r--tests/arc/twrong_sinkinference.nim2
62 files changed, 2839 insertions, 109 deletions
diff --git a/tests/arc/t16458.nim b/tests/arc/t16458.nim
new file mode 100644
index 000000000..6ae114287
--- /dev/null
+++ b/tests/arc/t16458.nim
@@ -0,0 +1,6 @@
+discard """
+  matrix: "--gc:orc --d:useNimRtl"
+  action: "compile"
+"""
+
+echo 134
\ No newline at end of file
diff --git a/tests/arc/t16558.nim b/tests/arc/t16558.nim
new file mode 100644
index 000000000..0dbe02b33
--- /dev/null
+++ b/tests/arc/t16558.nim
@@ -0,0 +1,9 @@
+discard """
+  matrix: "--gc:arc"
+  errormsg: "expression cannot be cast to 'int'"
+"""
+
+block: # bug #16558
+  var value = "hi there"
+  var keepInt: int
+  keepInt = cast[int](value)
diff --git a/tests/arc/t17812.nim b/tests/arc/t17812.nim
new file mode 100644
index 000000000..dd8ac89b0
--- /dev/null
+++ b/tests/arc/t17812.nim
@@ -0,0 +1,41 @@
+discard """
+  targets: "c js"
+  matrix: "--gc:refc; --gc:arc"
+"""
+
+import std/times
+
+block: # bug #17812
+  block:
+    type
+      Task = object
+        cb: proc ()
+
+    proc hello() = discard
+
+
+    let t = Task(cb: hello)
+
+    doAssert t.repr.len > 0
+
+
+  block:
+    type MyObj = object
+      field: DateTime
+
+
+    proc `$`(o: MyObj): string = o.repr
+
+    doAssert ($MyObj()).len > 0
+
+# bug #22175
+
+type Xxx = object
+  value: string
+
+proc complete(xxx: ref Xxx, v: sink string) =
+  xxx.value = move(v)
+
+let yyy = (ref Xxx)()
+
+yyy.complete("test")
diff --git a/tests/arc/t18645.nim b/tests/arc/t18645.nim
new file mode 100644
index 000000000..c5fddd4bb
--- /dev/null
+++ b/tests/arc/t18645.nim
@@ -0,0 +1,18 @@
+discard """
+  matrix: "--gc:arc; --gc:refc"
+  output: '''
+1
+2
+3
+'''
+"""
+
+proc bitTypeIdUnion() =
+  var bitId {.global.} = block:
+    0
+  inc bitId
+  echo bitId
+
+bitTypeIdUnion()
+bitTypeIdUnion()
+bitTypeIdUnion()
diff --git a/tests/arc/t18971.nim b/tests/arc/t18971.nim
new file mode 100644
index 000000000..9b587d956
--- /dev/null
+++ b/tests/arc/t18971.nim
@@ -0,0 +1,10 @@
+discard """
+  cmd: "nim c --gc:arc $file"
+"""
+
+type MyObj = ref object
+
+var o = MyObj()
+proc x: var MyObj = o
+
+var o2 = x()
diff --git a/tests/arc/t18977.nim b/tests/arc/t18977.nim
new file mode 100644
index 000000000..c775551a4
--- /dev/null
+++ b/tests/arc/t18977.nim
@@ -0,0 +1,26 @@
+discard """
+  matrix: "--mm:arc"
+"""
+
+type
+  E = enum
+    a, b, c, d
+  X = object
+    v: int
+  O = object
+    case kind: E
+    of a:
+      a: int
+    of {b, c}:
+      b: float
+    else:
+      d: X
+
+proc `=destroy`(x: var X) =
+  echo "x destroyed"
+
+var o = O(kind: d, d: X(v: 12345))
+doAssert o.d.v == 12345
+
+doAssertRaises(FieldDefect):
+  o.kind = a
diff --git a/tests/arc/t19231.nim b/tests/arc/t19231.nim
new file mode 100644
index 000000000..40fcf277c
--- /dev/null
+++ b/tests/arc/t19231.nim
@@ -0,0 +1,18 @@
+discard """
+  matrix: "--mm:orc"
+  targets: "c cpp"
+"""
+
+type
+  Game* = ref object
+
+proc free*(game: Game) =
+  var mixNumOpened:cint = 0
+  for i in 0..<mixNumOpened:
+    mixNumOpened -= 1
+
+proc newGame*(): Game =
+  new result, free
+
+var
+  game*: Game
diff --git a/tests/arc/t19364.nim b/tests/arc/t19364.nim
new file mode 100644
index 000000000..f520f3291
--- /dev/null
+++ b/tests/arc/t19364.nim
@@ -0,0 +1,30 @@
+discard """
+  cmd: '''nim c --gc:arc --expandArc:fooLeaks $file'''
+  nimout: '''
+--expandArc: fooLeaks
+
+var
+  tmpTuple_cursor
+  a_cursor
+  b_cursor
+  c_cursor
+tmpTuple_cursor = refTuple
+a_cursor = tmpTuple_cursor[0]
+b_cursor = tmpTuple_cursor[1]
+c_cursor = tmpTuple_cursor[2]
+-- end of expandArc ------------------------
+'''
+"""
+
+func fooLeaks(refTuple: tuple[a,
+                              b,
+                              c: seq[float]]): float =
+  let (a, b, c) = refTuple
+
+let refset = (a: newSeq[float](25_000_000),
+              b: newSeq[float](25_000_000),
+              c: newSeq[float](25_000_000))
+
+var res = newSeq[float](1_000_000)
+for i in 0 .. res.high:
+  res[i] = fooLeaks(refset)
diff --git a/tests/arc/t19401.nim b/tests/arc/t19401.nim
new file mode 100644
index 000000000..56702a4a2
--- /dev/null
+++ b/tests/arc/t19401.nim
@@ -0,0 +1,32 @@
+discard """
+  output: '''
+delete foo
+delete foo
+delete foo
+'''
+  matrix: "--mm:arc"
+"""
+
+type Foo = ref object
+  data: int
+proc delete(self: Foo) 
+proc newFoo: Foo =
+  let x = 12
+  discard x
+  new(result, delete)
+  result.data = x
+proc delete(self: Foo) =
+  doAssert self.data == 12
+  echo("delete foo")
+
+if isMainModule:
+  proc test() =
+    let x1 = newFoo()
+    let x2 = newFoo()
+    discard x1
+    discard x2
+    var x3: Foo
+    new(x3, delete)
+    x3.data = 12
+    discard x3
+  test()
diff --git a/tests/arc/t19402.nim b/tests/arc/t19402.nim
new file mode 100644
index 000000000..5ee6fc798
--- /dev/null
+++ b/tests/arc/t19402.nim
@@ -0,0 +1,32 @@
+discard """
+  output: '''
+delete foo
+delete foo
+delete foo
+'''
+  matrix: "--mm:arc"
+"""
+
+type Foo = ref object of RootObj
+  data: int
+proc delete(self: Foo)
+proc newFoo: Foo =
+  let x = 12
+  discard x
+  new(result, delete)
+  result.data = x
+proc delete(self: Foo) =
+  doAssert self.data == 12
+  echo("delete foo")
+
+if isMainModule:
+  proc test() =
+    let x1 = newFoo()
+    let x2 = newFoo()
+    discard x1
+    discard x2
+    var x3: Foo
+    new(x3, delete)
+    x3.data = 12
+    discard x3
+  test()
\ No newline at end of file
diff --git a/tests/arc/t19435.nim b/tests/arc/t19435.nim
new file mode 100644
index 000000000..519216bad
--- /dev/null
+++ b/tests/arc/t19435.nim
@@ -0,0 +1,29 @@
+discard """
+  matrix: "--gc:arc"
+"""
+
+# bug #19435
+{.experimental: "views".}
+
+type
+  Bar = object
+    placeholder: int
+  Foo = object
+    placeholder: int
+    c: seq[Bar] # remove this line to make things right
+
+func children*(s: var seq[Foo]): openArray[Foo] =
+  s.toOpenArray(0, s.len-1)
+
+proc test =
+  var foos = @[Foo(), Foo()]
+
+  assert foos.children.len == 2
+  var flag = true
+  for a in foos.children:
+    flag = false
+
+  if flag:
+    doAssert false
+
+test()
\ No newline at end of file
diff --git a/tests/arc/t19457.nim b/tests/arc/t19457.nim
new file mode 100644
index 000000000..78447ce82
--- /dev/null
+++ b/tests/arc/t19457.nim
@@ -0,0 +1,16 @@
+discard """
+  matrix: "--gc:refc; --gc:arc"
+"""
+
+# bug #19457
+proc gcd(x, y: seq[int]): seq[int] =
+    var
+      a = x
+      b = y
+    while b[0] > 0:
+      let c = @[a[0] mod b[0]]
+      a = b
+      b = c
+    return a
+
+doAssert gcd(@[1], @[2]) == @[1]
\ No newline at end of file
diff --git a/tests/arc/t19862.nim b/tests/arc/t19862.nim
new file mode 100644
index 000000000..6d3f57692
--- /dev/null
+++ b/tests/arc/t19862.nim
@@ -0,0 +1,15 @@
+discard """
+  matrix: "--gc:refc; --gc:arc"
+"""
+
+import std/widestrs
+
+# bug #19862
+type NewString = object
+
+proc len(s: NewString): int = 10
+
+converter toNewString(x: WideCStringObj): NewString = discard
+
+let w = newWideCString("test")
+doAssert len(w) == 4
diff --git a/tests/arc/t20456.nim b/tests/arc/t20456.nim
new file mode 100644
index 000000000..ace79255a
--- /dev/null
+++ b/tests/arc/t20456.nim
@@ -0,0 +1,7 @@
+discard """
+  cmd: "nim check $file"
+  action: "compile"
+"""
+
+when not defined(gcOrc):
+  {.error: "orc".}
diff --git a/tests/arc/t20588.nim b/tests/arc/t20588.nim
new file mode 100644
index 000000000..008bd1dcd
--- /dev/null
+++ b/tests/arc/t20588.nim
@@ -0,0 +1,25 @@
+discard """
+  cmd: "nim check --warnings:off --hints:off $file"
+  errormsg: ""
+  nimout: '''
+t20588.nim(20, 12) Error: illegal type conversion to 'auto'
+t20588.nim(21, 14) Error: illegal type conversion to 'typed'
+t20588.nim(22, 16) Error: illegal type conversion to 'untyped'
+t20588.nim(24, 7) Error: illegal type conversion to 'any'
+'''
+"""
+
+
+
+
+
+
+
+
+
+discard 0.0.auto
+discard typed("abc")
+discard untyped(4)
+var a = newSeq[bool](1000)
+if any(a):
+  echo "ok?"
\ No newline at end of file
diff --git a/tests/arc/t21184.nim b/tests/arc/t21184.nim
new file mode 100644
index 000000000..91d0c42c7
--- /dev/null
+++ b/tests/arc/t21184.nim
@@ -0,0 +1,77 @@
+discard """
+  matrix: "--mm:orc"
+"""
+
+import std/[with]
+
+type
+  Node* {.acyclic.} = ref object of RootObj
+    name: string
+    data: pointer
+    children: seq[Node]
+  TextNode = ref object of Node
+    text: string
+
+proc fakeEcho(s: string) =
+  if s.len < 0:
+    echo s
+
+proc newNode[T: Node](parent: Node): T =
+  new result
+  result.data = alloc0(250)
+  parent.children.add(result)
+
+proc newRootNode(): Node =
+  new result
+  result.data = alloc0(250)
+
+method printNode(node: Node) {.base.} =
+  fakeEcho node.name
+
+method printNode(node: TextNode) =
+  procCall printNode(Node(node))
+  fakeEcho node.text
+
+proc printChildren(node: Node) =
+  for child in node.children:
+    child.printNode()
+    printChildren(child)
+
+proc free(node: Node) =
+  for child in node.children:
+    free(child)
+  dealloc(node.data)
+
+template node(parent: Node, body: untyped): untyped =
+  var node = newNode[Node](parent)
+  with node:
+    body
+
+proc textNode(parent: Node, text: string) =
+  var node = newNode[TextNode](parent)
+  node.text = text
+
+template withRootNode(body: untyped): untyped =
+  var root = newRootNode()
+  root.name = "root"
+  with root:
+    body
+  root.printNode()
+  printChildren(root)
+  root.free()
+
+proc doTest() =
+  withRootNode:
+    node:
+      name = "child1"
+      node:
+        name = "child2"
+        node:
+          name = "child3"
+          textNode "Hello, world!"
+
+
+# bug #21171
+if isMainModule:
+  for i in 0..100000:
+    doTest()
diff --git a/tests/arc/t22218.nim b/tests/arc/t22218.nim
new file mode 100644
index 000000000..7837ed1d0
--- /dev/null
+++ b/tests/arc/t22218.nim
@@ -0,0 +1,25 @@
+discard """
+  cmd: "nim c --mm:arc $file"
+  errormsg: "'=copy' is not available for type <Obj>; requires a copy because it's not the last read of 'chan[]'; routine: test"
+"""
+
+# bug #22218
+type Obj[T] = object
+  v: T
+
+proc `=copy`[T](
+    dest: var Obj[T],
+    source: Obj[T]
+  ) {.error: "A channel cannot be copied".}
+
+from system/ansi_c import c_calloc
+
+proc test() =
+    var v: bool = true
+    var chan = cast[ptr Obj[int]](c_calloc(1, csize_t sizeof(Obj[int])))
+    var copy = chan[]
+
+    echo chan.v
+    echo v
+
+test()
\ No newline at end of file
diff --git a/tests/arc/t22237.nim b/tests/arc/t22237.nim
new file mode 100644
index 000000000..c6dbf768a
--- /dev/null
+++ b/tests/arc/t22237.nim
@@ -0,0 +1,55 @@
+discard """
+  matrix: "--mm:arc; --mm:orc"
+"""
+
+import std/macros
+import std/streams
+
+# bug #22237
+
+proc iterlines_closure2(f: File | Stream): iterator (): string =
+  result = iterator(): string =
+    for line in f.lines:
+      if line.len == 0:
+        break
+      yield line
+
+proc test() =
+  let f = newStringStream("""
+    1
+    2
+
+    3
+    4
+
+    5
+    6
+    7
+
+    8
+""")
+  while not f.atEnd():
+    let iterator_inst = iterlines_closure2(f)
+    for item in iterator_inst(): # Fails with "SIGSEGV: Illegal storage access. (Attempt to read from nil?)"
+      discard
+
+test()
+
+# bug #21160
+import sequtils
+
+iterator allMoves(fls: seq[int]): seq[int] =
+  yield fls
+
+proc neighbors(flrs: seq[int]): iterator: seq[int] =
+  return iterator(): seq[int] =
+    for flrs2 in allMoves(flrs):
+      yield flrs2
+      for flrs3 in allMoves(flrs2):
+        yield flrs3
+
+let f = @[1]
+for _ in neighbors(f):
+  discard
+for _ in neighbors(f):
+  discard
diff --git a/tests/arc/t22478.nim b/tests/arc/t22478.nim
new file mode 100644
index 000000000..5373fa161
--- /dev/null
+++ b/tests/arc/t22478.nim
@@ -0,0 +1,46 @@
+discard """
+  matrix: "-d:nimNoLentIterators --mm:arc"
+  output: '''PUSH DATA: {"test.message":{"test":{"nested":"v1"}}}'''
+  joinable: false
+"""
+
+# bug #22748
+import std/[json, typetraits, times]
+
+# publish
+
+proc publish*[T](payload: T) =
+  discard
+
+type MetricsPoint* = JsonNode
+
+proc push*(stat: string, data: JsonNode, usec: int64 = 0) =
+  let payload = newJObject()
+
+  # this results in a infinite recursion unless we deepCopy()
+  payload[stat] = data #.deepCopy
+
+  echo "PUSH DATA: ", payload
+
+  publish[MetricsPoint](payload)
+
+var scopes {.threadvar.}: seq[JsonNode]
+
+type WithTimeCallback*[T] = proc(data: var JsonNode): T
+
+proc pushScoped*[T](metric: string, blk: WithTimeCallback[T]): T {.gcsafe.} =
+  scopes.add newJObject()
+  defer: discard scopes.pop()
+
+  let stc = (cpuTime() * 1000_000).int64
+  result = blk(scopes[^1])
+  let dfc = (cpuTime() * 1000_000).int64 - stc
+
+  push(metric, scopes[^1], dfc)
+
+# demo code
+
+discard pushScoped[int]("test.message") do (data: var JsonNode) -> int:
+  data["test"] = %*{
+    "nested": "v1"
+  }
\ No newline at end of file
diff --git a/tests/arc/t22787.nim b/tests/arc/t22787.nim
new file mode 100644
index 000000000..5840a984b
--- /dev/null
+++ b/tests/arc/t22787.nim
@@ -0,0 +1,37 @@
+discard """
+  joinable: false
+"""
+
+import std/assertions
+
+proc foo =
+  var s:seq[string]
+  var res = ""
+
+  for i in 0..3:
+    s.add ("test" & $i)
+    s.add ("test" & $i)
+
+  var lastname:string
+
+  for i in s:
+    var name = i[0..4]
+
+    if name != lastname:
+      res.add "NEW:" & name & "\n"
+    else:
+      res.add name & ">" & lastname & "\n"
+
+    lastname = name
+
+  doAssert res == """
+NEW:test0
+test0>test0
+NEW:test1
+test1>test1
+NEW:test2
+test2>test2
+NEW:test3
+test3>test3
+"""
+foo()
\ No newline at end of file
diff --git a/tests/arc/t23247.nim b/tests/arc/t23247.nim
new file mode 100644
index 000000000..0fadc50cd
--- /dev/null
+++ b/tests/arc/t23247.nim
@@ -0,0 +1,52 @@
+discard """
+  matrix: ";-d:useMalloc"
+"""
+
+# bug #23247
+import std/hashes
+
+func baseAddr[T](x: openArray[T]): ptr T =
+  # Return the address of the zero:th element of x or `nil` if x is empty
+  if x.len == 0: nil else: cast[ptr T](x)
+
+func makeUncheckedArray[T](p: ptr T): ptr UncheckedArray[T] =
+  cast[ptr UncheckedArray[T]](p)
+
+type
+  LabelKey = object
+    data: seq[string]
+    refs: ptr UncheckedArray[string]
+    refslen: int
+
+  Gauge = ref object
+    metrics: seq[seq[seq[string]]]
+
+template values(key: LabelKey): openArray[string] =
+  if key.refslen > 0:
+    key.refs.toOpenArray(0, key.refslen - 1)
+  else:
+    key.data
+
+proc hash(key: LabelKey): Hash =
+  hash(key.values)
+
+proc view(T: type LabelKey, values: openArray[string]): T =
+  # TODO some day, we might get view types - until then..
+  LabelKey(refs: baseAddr(values).makeUncheckedArray(), refslen: values.len())
+
+template withValue2(k: untyped) =
+  discard hash(k)
+
+proc setGauge(
+    collector: Gauge,
+    labelValues: openArray[string],
+) =
+  let v = LabelKey.view(labelValues)
+  withValue2(v)
+  collector.metrics.add @[@labelValues, @labelValues]
+  discard @labelValues
+
+var nim_gc_mem_bytes = Gauge()
+let threadID = $getThreadId()
+setGauge(nim_gc_mem_bytes, @[threadID])
+setGauge(nim_gc_mem_bytes, @[threadID])
\ No newline at end of file
diff --git a/tests/arc/t9650.nim b/tests/arc/t9650.nim
new file mode 100644
index 000000000..a8182db68
--- /dev/null
+++ b/tests/arc/t9650.nim
@@ -0,0 +1,87 @@
+discard """
+  matrix: "--gc:arc"
+"""
+
+import typetraits
+
+# bug #9650
+type
+  SharedPtr*[T] = object
+    val: ptr tuple[atomicCounter: int, value: T]
+
+  Node*[T] = object
+    value: T
+    next: SharedPtr[Node[T]]
+
+  ForwardList*[T] = object
+    first: SharedPtr[Node[T]]
+
+proc `=destroy`*[T](p: var SharedPtr[T]) =
+  if p.val != nil:
+    let c = atomicDec(p.val[].atomicCounter)
+    if c == 0:
+      when not supportsCopyMem(T):
+         `=destroy`(p.val[])
+      dealloc(p.val)
+    p.val = nil
+
+proc `=`*[T](dest: var SharedPtr[T], src: SharedPtr[T]) =
+  if dest.val != src.val:
+    if dest.val != nil:
+      `=destroy`(dest)
+    if src.val != nil:
+      discard atomicInc(src.val[].atomicCounter)
+      dest.val = src.val
+
+proc `=sink`*[T](dest: var SharedPtr[T], src: SharedPtr[T]) =
+  if dest.val != nil and dest.val != src.val:
+    `=destroy`(dest)
+  dest.val = src.val
+
+ 
+proc newSharedPtr*[T](val: sink T): SharedPtr[T] =
+  result.val = cast[type(result.val)](alloc(sizeof(result.val[])))
+  reset(result.val[])
+  result.val.atomicCounter = 1
+  result.val.value = val
+
+proc isNil*[T](p: SharedPtr[T]): bool =
+  p.val == nil
+
+template `->`*[T](p: SharedPtr[T], name: untyped): untyped =
+  p.val.value.name
+
+proc createNode[T](val: T): SharedPtr[ Node[T] ]=
+  result = newSharedPtr(Node[T](value: val))
+
+proc push_front*[T](list: var ForwardList[T], val: T) =
+  var newElem = createNode(val)
+  newElem->next = list.first
+  list.first = newElem
+
+proc pop_front*[T](list: var ForwardList[T]) =
+  let head = list.first
+  list.first = head->next
+
+proc toString*[T](list: ForwardList[T]): string =
+  result = "["
+  var head = list.first
+  while not head.isNil:
+    result &= $(head->value) & ", "
+    head = head->next
+  result &= ']'
+
+block:
+  var x: ForwardList[int]
+  x.push_front(1)
+  x.push_front(2)
+  x.push_front(3)
+
+  doAssert toString(x) == "[3, 2, 1, ]"
+
+  x.pop_front()
+  x.pop_front()
+  doAssert toString(x) == "[1, ]"
+
+  x.pop_front()
+  doAssert toString(x) == "[]"
diff --git a/tests/arc/taliased_reassign.nim b/tests/arc/taliased_reassign.nim
new file mode 100644
index 000000000..5563fae8c
--- /dev/null
+++ b/tests/arc/taliased_reassign.nim
@@ -0,0 +1,41 @@
+discard """
+  matrix: "--mm:orc"
+"""
+
+# bug #20993
+
+type
+  Dual[int] = object # must be generic (even if fully specified)
+    p: int
+proc D(p: int): Dual[int] = Dual[int](p: p)
+proc `+`(x: Dual[int], y: Dual[int]): Dual[int] = D(x.p + y.p)
+
+type
+  Tensor[T] = object
+    buf: seq[T]
+proc newTensor*[T](s: int): Tensor[T] = Tensor[T](buf: newSeq[T](s))
+proc `[]`*[T](t: Tensor[T], idx: int): T = t.buf[idx]
+proc `[]=`*[T](t: var Tensor[T], idx: int, val: T) = t.buf[idx] = val
+
+proc `+.`[T](t1, t2: Tensor[T]): Tensor[T] =
+  let n = t1.buf.len
+  result = newTensor[T](n)
+  for i in 0 ..< n:
+    result[i] = t1[i] + t2[i]
+
+proc toTensor*[T](a: sink seq[T]): Tensor[T] =
+  ## This breaks it: Using `T` instead makes it work
+  type U = typeof(a[0])
+  var t: Tensor[U] # Tensor[T] works
+  t.buf = a
+  result = t
+
+proc loss() =
+  var B = toTensor(@[D(123)])
+  let a = toTensor(@[D(-10)])
+  B = B +. a
+  doAssert B[0].p == 113, "I want to be 113, but I am " & $B[0].p
+
+loss()
+
+
diff --git a/tests/arc/tarc_macro.nim b/tests/arc/tarc_macro.nim
new file mode 100644
index 000000000..33ade1da4
--- /dev/null
+++ b/tests/arc/tarc_macro.nim
@@ -0,0 +1,57 @@
+import macros
+
+var destroyCalled = false
+macro bar() =
+  let s = newTree(nnkAccQuoted, ident"=destroy")
+  # let s = ident"`=destroy`" # this would not work
+  result = quote do:
+    type Foo = object
+    # proc `=destroy`(a: var Foo) = destroyCalled = true # this would not work
+    proc `s`(a: var Foo) = destroyCalled = true
+    block:
+      let a = Foo()
+bar()
+doAssert destroyCalled
+
+# custom `op`
+var destroyCalled2 = false
+macro bar(ident) =
+  var x = 1.5
+  result = quote("@") do:
+    type Foo = object
+    let `@ident` = 0 # custom op interpolated symbols need quoted (``)
+    proc `=destroy`(a: var Foo) =
+      doAssert @x == 1.5
+      doAssert compiles(@x == 1.5)
+      let b1 = @[1,2]
+      let b2 = @@[1,2]
+      doAssert $b1 == "[1, 2]"
+      doAssert $b2 == "@[1, 2]"
+      destroyCalled2 = true
+    block:
+      let a = Foo()
+bar(someident)
+doAssert destroyCalled2
+
+proc `&%`(x: int): int = 1
+proc `&%`(x, y: int): int = 2
+
+macro bar2() =
+  var x = 3
+  result = quote("&%") do:
+    var y = &%x # quoting operator
+    doAssert &%&%y == 1 # unary operator => need to escape
+    doAssert y &% y == 2 # binary operator => no need to escape
+    doAssert y == 3
+bar2()
+
+block:
+  macro foo(a: openArray[string] = []): string =
+    echo a # Segfault doesn't happen if this is removed
+    newLit ""
+
+  proc bar(a: static[openArray[string]] = []) =
+    const tmp = foo(a)
+
+  # bug #22909
+  doAssert not compiles(bar())
diff --git a/tests/arc/tarc_orc.nim b/tests/arc/tarc_orc.nim
new file mode 100644
index 000000000..f2c7de2fc
--- /dev/null
+++ b/tests/arc/tarc_orc.nim
@@ -0,0 +1,186 @@
+discard """
+  targets: "c cpp"
+  matrix: "--mm:arc; --mm:orc"
+"""
+
+block:
+  type
+    PublicKey = array[32, uint8]
+    PrivateKey = array[64, uint8]
+
+  proc ed25519_create_keypair(publicKey: ptr PublicKey; privateKey: ptr PrivateKey) =
+    publicKey[][0] = uint8(88)
+
+  type
+    KeyPair = object
+      public: PublicKey
+      private: PrivateKey
+
+  proc initKeyPair(): KeyPair =
+    ed25519_create_keypair(result.public.addr, result.private.addr)
+
+  let keys = initKeyPair()
+  doAssert keys.public[0] == 88
+
+
+template minIndexByIt: untyped =
+  var other = 3
+  other
+
+proc bug20303() =
+  var hlibs = @["hello", "world", "how", "are", "you"]
+  let res = hlibs[minIndexByIt()]
+  doAssert res == "are"
+
+bug20303()
+
+proc main() = # todo bug with templates
+  block: # bug #11267
+    var a: seq[char] = block: @[]
+    doAssert a == @[]
+    # 2
+    proc b: seq[string] =
+      discard
+      @[]
+    doAssert b() == @[]
+static: main()
+main()
+
+
+type Obj = tuple
+  value: int
+  arr: seq[int]
+
+proc bug(): seq[Obj] =
+  result.add (value: 0, arr: @[])
+  result[^1].value = 1
+  result[^1].arr.add 1
+
+# bug #19990
+let s = bug()
+doAssert s[0] == (value: 1, arr: @[1])
+
+block: # bug #21974
+  type Test[T] = ref object
+      values : seq[T]
+      counter: int
+
+  proc newTest[T](): Test[T] =
+      result         = new(Test[T])
+      result.values  = newSeq[T](16)
+      result.counter = 0
+
+  proc push[T](self: Test[T], value: T) =
+      self.counter += 1
+      if self.counter >= self.values.len:
+          self.values.setLen(self.values.len * 2)
+      self.values[self.counter - 1] = value
+
+  proc pop[T](self: Test[T]): T =
+      result         = self.values[0]
+      self.values[0] = self.values[self.counter - 1] # <--- This line
+      self.counter  -= 1
+
+
+  type X = tuple
+      priority: int
+      value   : string
+
+  var a = newTest[X]()
+  a.push((1, "One"))
+  doAssert a.pop.value == "One"
+
+# bug #21987
+
+type
+  EmbeddedImage* = distinct Image
+  Image = object
+    len: int
+
+proc imageCopy*(image: Image): Image {.nodestroy.}
+
+proc `=destroy`*(x: var Image) =
+  discard
+proc `=sink`*(dest: var Image; source: Image) =
+  `=destroy`(dest)
+  wasMoved(dest)
+
+proc `=dup`*(source: Image): Image {.nodestroy.} =
+  result = imageCopy(source)
+
+proc `=copy`*(dest: var Image; source: Image) =
+  dest = imageCopy(source) # calls =sink implicitly
+
+proc `=destroy`*(x: var EmbeddedImage) = discard
+
+proc `=dup`*(source: EmbeddedImage): EmbeddedImage {.nodestroy.} = source
+
+proc `=copy`*(dest: var EmbeddedImage; source: EmbeddedImage) {.nodestroy.} =
+  dest = source
+
+proc imageCopy*(image: Image): Image =
+  result = image
+
+proc main2 =
+  block:
+    var a = Image(len: 2).EmbeddedImage
+    var b = Image(len: 1).EmbeddedImage
+    b = a
+    doAssert Image(a).len == 2
+    doAssert Image(b).len == 2
+
+  block:
+    var a = Image(len: 2)
+    var b = Image(len: 1)
+    b = a
+    doAssert a.len == 2
+    doAssert b.len == 0
+
+main2()
+
+block:
+  type
+    TestObj = object of RootObj
+      name: string
+    
+    TestSubObj = object of TestObj
+      objname: string
+
+  proc `=destroy`(x: TestObj) =
+    `=destroy`(x.name)
+
+  proc `=destroy`(x: TestSubObj) =
+    `=destroy`(x.objname)
+    `=destroy`(TestObj(x))
+
+  proc testCase() =
+    let t1 {.used.} = TestSubObj(objname: "tso1", name: "to1")
+
+  proc main() =
+    testCase()
+
+  main()
+
+block: # bug #23858
+  type Object = object
+    a: int
+    b: ref int
+  var x = 0
+  proc fn(): auto {.cdecl.} =
+    inc x
+    return Object()
+  discard fn()
+  doAssert x == 1
+
+block: # bug #24147
+  type
+    O = object of RootObj
+      val: string
+    OO = object of O
+
+  proc `=copy`(dest: var O, src: O) =
+      dest.val = src.val
+
+  let oo = OO(val: "hello world")
+  var ooCopy : OO
+  `=copy`(ooCopy, oo)
diff --git a/tests/arc/tarcmisc.nim b/tests/arc/tarcmisc.nim
index 55803085f..b4476ef4f 100644
--- a/tests/arc/tarcmisc.nim
+++ b/tests/arc/tarcmisc.nim
@@ -1,5 +1,7 @@
 discard """
   output: '''
+Destructor for TestTestObj
+=destroy called
 123xyzabc
 destroyed: false
 destroyed: false
@@ -26,14 +28,90 @@ new line after - @['a']
 finalizer
 aaaaa
 hello
+true
+copying
+123
+42
+@["", "d", ""]
 ok
-closed
 destroying variable: 20
 destroying variable: 10
+closed
 '''
-  cmd: "nim c --gc:arc --deepcopy:on $file"
+  cmd: "nim c --mm:arc --deepcopy:on -d:nimAllocPagesViaMalloc $file"
 """
 
+block: # bug #23627
+  type
+    TestObj = object of RootObj
+
+    Test2 = object of RootObj
+      foo: TestObj
+
+    TestTestObj = object of RootObj
+      shit: TestObj
+
+  proc `=destroy`(x: TestTestObj) =
+    echo "Destructor for TestTestObj"
+    let test = Test2(foo: TestObj())
+
+  proc testCaseT() =
+    let tt1 {.used.} = TestTestObj(shit: TestObj())
+
+
+  proc main() =
+    testCaseT()
+
+  main()
+
+
+# bug #9401
+
+type
+  MyObj = object
+    len: int
+    data: ptr UncheckedArray[float]
+
+proc `=destroy`*(m: MyObj) =
+
+  echo "=destroy called"
+
+  if m.data != nil:
+    deallocShared(m.data)
+
+type
+  MyObjDistinct = distinct MyObj
+
+proc `=copy`*(m: var MyObj, m2: MyObj) =
+  if m.data == m2.data: return
+  if m.data != nil:
+    `=destroy`(m)
+  m.len = m2.len
+  if m.len > 0:
+    m.data = cast[ptr UncheckedArray[float]](allocShared(sizeof(float) * m.len))
+    copyMem(m.data, m2.data, sizeof(float) * m.len)
+
+
+proc `=sink`*(m: var MyObj, m2: MyObj) =
+  if m.data != m2.data:
+    if m.data != nil:
+      `=destroy`(m)
+    m.len = m2.len
+    m.data = m2.data
+
+proc newMyObj(len: int): MyObj =
+  result.len = len
+  result.data = cast[ptr UncheckedArray[float]](allocShared(sizeof(float) * len))
+
+proc newMyObjDistinct(len: int): MyObjDistinct =
+  MyObjDistinct(newMyObj(len))
+
+proc fooDistinct =
+  doAssert newMyObjDistinct(2).MyObj.len == 2
+
+fooDistinct()
+
+
 proc takeSink(x: sink string): bool = true
 
 proc b(x: sink string): string =
@@ -51,7 +129,7 @@ bbb("123")
 type Variable = ref object
   value: int
 
-proc `=destroy`(self: var typeof(Variable()[])) =
+proc `=destroy`(self: typeof(Variable()[])) =
   echo "destroying variable: ",self.value
 
 proc newVariable(value: int): Variable =
@@ -71,7 +149,7 @@ proc test(count: int) =
 test(3)
 
 proc test2(count: int) =
-  #block: #XXX: Fails with block currently
+  block: #XXX: Fails with block currently
     var v {.global.} = newVariable(20)
 
     var count = count - 1
@@ -105,7 +183,7 @@ type
   B = ref object of A
     x: int
 
-proc `=destroy`(x: var AObj) =
+proc `=destroy`(x: AObj) =
   close(x.io)
   echo "closed"
 
@@ -390,3 +468,369 @@ proc newPixelBuffer(): PixelBuffer =
 
 discard newPixelBuffer()
 
+
+# bug #17199
+
+proc passSeq(data: seq[string]) =
+  # used the system.& proc initially
+  let wat = data & "hello"
+
+proc test2 =
+  let name = @["hello", "world"]
+  passSeq(name)
+  doAssert name == @["hello", "world"]
+
+static: test2() # was buggy
+test2()
+
+proc merge(x: sink seq[string], y: sink string): seq[string] =
+  newSeq(result, x.len + 1)
+  for i in 0..x.len-1:
+    result[i] = move(x[i])
+  result[x.len] = move(y)
+
+proc passSeq2(data: seq[string]) =
+  # used the system.& proc initially
+  let wat = merge(data, "hello")
+
+proc test3 =
+  let name = @["hello", "world"]
+  passSeq2(name)
+  doAssert name == @["hello", "world"]
+
+static: test3() # was buggy
+test3()
+
+# bug #17712
+proc t17712 =
+  var ppv = new int
+  discard @[ppv]
+  var el: ref int
+  el = [ppv][0]
+  echo el != nil
+
+t17712()
+
+# bug #18030
+
+type
+  Foo = object
+    n: int
+
+proc `=copy`(dst: var Foo, src: Foo) =
+  echo "copying"
+  dst.n = src.n
+
+proc `=sink`(dst: var Foo, src: Foo) =
+  echo "sinking"
+  dst.n = src.n
+
+var a: Foo
+
+proc putValue[T](n: T)
+
+proc useForward =
+  putValue(123)
+
+proc putValue[T](n: T) =
+  var b = Foo(n:n)
+  a = b
+  echo b.n
+
+useForward()
+
+
+# bug #17319
+type
+  BrokenObject = ref object
+    brokenType: seq[int]
+
+proc use(obj: BrokenObject) =
+  discard
+
+method testMethod(self: BrokenObject) {.base.} =
+  iterator testMethodIter() {.closure.} =
+    use(self)
+
+  var nameIterVar = testMethodIter
+  nameIterVar()
+
+let mikasa = BrokenObject()
+mikasa.testMethod()
+
+# bug #19205
+type
+  InputSectionBase* = object of RootObj
+    relocations*: seq[int]   # traced reference. string has a similar SIGSEGV.
+  InputSection* = object of InputSectionBase
+
+proc fooz(sec: var InputSectionBase) =
+  if sec of InputSection:  # this line SIGSEGV.
+    echo 42
+
+var sec = create(InputSection)
+sec[] = InputSection(relocations: newSeq[int]())
+fooz sec[]
+
+block:
+  type
+    Data = ref object
+      id: int
+  proc main =
+    var x = Data(id: 99)
+    var y = x
+    x[] = Data(id: 778)[]
+    doAssert y.id == 778
+    doAssert x[].id == 778
+  main()
+
+block: # bug #19857
+  type
+    ValueKind = enum VNull, VFloat, VObject # need 3 elements. Cannot remove VNull or VObject
+
+    Value = object
+      case kind: ValueKind
+      of VFloat: fnum: float
+      of VObject: tab: Table[int, int] # OrderedTable[T, U] also makes it fail.
+                                      # "simpler" types also work though
+      else: discard # VNull can be like this, but VObject must be filled
+
+    # required. Pure proc works
+    FormulaNode = proc(c: OrderedTable[string, int]): Value
+
+  proc toF(v: Value): float =
+    doAssert v.kind == VFloat
+    case v.kind
+    of VFloat: result = v.fnum
+    else: discard
+
+
+  proc foo() =
+    let fuck = initOrderedTable[string, int]()
+    proc cb(fuck: OrderedTable[string, int]): Value =
+                            # works:
+                            #result = Value(kind: VFloat, fnum: fuck["field_that_does_not_exist"].float)
+                            # broken:
+      discard "actuall runs!"
+      let t = fuck["field_that_does_not_exist"]
+      echo "never runs, but we crash after! ", t
+
+    doAssertRaises(KeyError):
+      let fn = FormulaNode(cb)
+      let v = fn(fuck)
+      #echo v
+      let res = v.toF()
+
+  foo()
+
+import std/options
+
+# bug #21592
+type Event* = object
+  code*: string
+
+type App* = ref object of RootObj
+  id*: string
+
+method process*(self: App): Option[Event] {.base.} =
+  raise Exception.new_exception("not impl")
+
+# bug #21617
+type Test2 = ref object of RootObj
+
+method bug(t: Test2): seq[float] {.base.} = discard
+
+block: # bug #22664
+  type
+    ElementKind = enum String, Number
+    Element = object
+      case kind: ElementKind
+      of String:
+        str: string
+      of Number:
+        num: float
+    Calc = ref object
+      stack: seq[Element]
+
+  var calc = new Calc
+
+  calc.stack.add Element(kind: Number, num: 200.0)
+  doAssert $calc.stack == "@[(kind: Number, num: 200.0)]"
+  let calc2 = calc
+  calc2.stack = calc.stack # This nulls out the object in the stack
+  doAssert $calc.stack == "@[(kind: Number, num: 200.0)]"
+  doAssert $calc2.stack == "@[(kind: Number, num: 200.0)]"
+
+block: # bug #19250
+  type
+    Bar[T] = object
+      err: proc(): string
+
+    Foo[T] = object
+      run: proc(): Bar[T]
+
+  proc bar[T](err: proc(): string): Bar[T] =
+    assert not err.isNil
+    Bar[T](err: err)
+
+  proc foo(): Foo[char] = 
+    result.run = proc(): Bar[char] =
+      # works
+      # result = Bar[char](err: proc(): string = "x")
+      # not work
+      result = bar[char](proc(): string = "x")
+
+  proc bug[T](fs: Foo[T]): Foo[T] =
+    result.run = proc(): Bar[T] =
+      let res = fs.run()
+      
+      # works
+      # var errors = @[res.err] 
+      
+      # not work
+      var errors: seq[proc(): string]
+      errors.add res.err
+      
+      return bar[T] do () -> string:
+        for err in errors:
+          result.add res.err()
+
+  doAssert bug(foo()).run().err() == "x"
+
+block: # bug #22259
+  type
+    ProcWrapper = tuple
+      p: proc() {.closure.}
+
+
+  proc f(wrapper: ProcWrapper) =
+    let s = @[wrapper.p]
+    let a = [wrapper.p]
+
+  proc main =
+    # let wrapper: ProcWrapper = ProcWrapper(p: proc {.closure.} = echo 10)
+    let wrapper: ProcWrapper = (p: proc {.closure.} = echo 10)
+    f(wrapper)
+
+  main()
+
+block:
+  block: # bug #22923
+    block:
+      let
+        a: int = 100
+        b: int32 = 200'i32
+
+      let
+        x = arrayWith(a, 8) # compiles
+        y = arrayWith(b, 8) # internal error
+        z = arrayWith(14, 8) # integer literal also results in a crash
+
+      doAssert x == [100, 100, 100, 100, 100, 100, 100, 100]
+      doAssert $y == "[200, 200, 200, 200, 200, 200, 200, 200]"
+      doAssert z == [14, 14, 14, 14, 14, 14, 14, 14]
+
+    block:
+      let a: string = "nim"
+      doAssert arrayWith(a, 3) == ["nim", "nim", "nim"]
+
+      let b: char = 'c'
+      doAssert arrayWith(b, 3) == ['c', 'c', 'c']
+
+      let c: uint = 300'u
+      doAssert $arrayWith(c, 3) == "[300, 300, 300]"
+
+block: # bug #23505
+  type
+    K = object
+    C = object
+      value: ptr K
+
+  proc init(T: type C): C =
+    let tmp = new K
+    C(value: addr tmp[])
+
+  discard init(C)
+
+block: # bug #23524
+  type MyType = object
+    a: int
+
+  proc `=destroy`(typ: MyType) = discard
+
+  var t1 = MyType(a: 100)
+  var t2 = t1 # Should be a copy?
+
+  proc main() =
+    t2 = t1
+    doAssert t1.a == 100
+    doAssert t2.a == 100
+
+  main()
+
+block: # bug #23907
+  type
+    Thingy = object
+      value: int
+
+    ExecProc[C] = proc(value: sink C): int {.nimcall.}
+
+  proc `=copy`(a: var Thingy, b: Thingy) {.error.}
+
+  var thingyDestroyCount = 0
+
+  proc `=destroy`(thingy: Thingy) =
+    assert(thingyDestroyCount <= 0)
+    thingyDestroyCount += 1
+
+  proc store(value: sink Thingy): int =
+    result = value.value
+
+  let callback: ExecProc[Thingy] = store
+
+  doAssert callback(Thingy(value: 123)) == 123
+
+import std/strutils
+
+block: # bug #23974
+  func g(e: seq[string]): lent seq[string] = result = e
+  proc k(f: string): seq[string] = f.split("/")
+  proc n() =
+    const r = "/d/"
+    let t =
+      if true:
+        k(r).g()
+      else:
+        k("/" & r).g()
+    echo t
+
+  n()
+
+block: # bug #23973
+  func g(e: seq[string]): lent seq[string] = result = e
+  proc k(f: string): seq[string] = f.split("/")
+  proc n() =
+    const r = "/test/empty"  # or "/test/empty/1"
+    let a = k(r).g()
+    let t =
+      if true:
+        k(r).g()
+      else:
+        k("/" & r).g()   # or raiseAssert ""
+    doAssert t == a
+
+  n()
+
+block: # bug #24141
+  func reverse(s: var openArray[char]) =
+    s[0] = 'f'
+
+  func rev(s: var string) =
+    s.reverse
+
+  proc main =
+    var abc = "abc"
+    abc.rev
+    doAssert abc == "fbc"
+
+  main()
diff --git a/tests/arc/tasyncawait.nim b/tests/arc/tasyncawait.nim
index 75d9bc9b5..91a7453cd 100644
--- a/tests/arc/tasyncawait.nim
+++ b/tests/arc/tasyncawait.nim
@@ -40,7 +40,7 @@ proc readMessages(client: AsyncFD) {.async.} =
       clientCount.inc
       break
     else:
-      if line.startswith("Message "):
+      if line.startsWith("Message "):
         msgCount.inc
       else:
         doAssert false
diff --git a/tests/arc/tasyncleak.nim b/tests/arc/tasyncleak.nim
index eb0c45213..8e3a7b3e7 100644
--- a/tests/arc/tasyncleak.nim
+++ b/tests/arc/tasyncleak.nim
@@ -1,5 +1,5 @@
 discard """
-  outputsub: "(allocCount: 4302, deallocCount: 4300)"
+  outputsub: "(allocCount: 4050, deallocCount: 4048)"
   cmd: "nim c --gc:orc -d:nimAllocStats $file"
 """
 
diff --git a/tests/arc/tcaseobj.nim b/tests/arc/tcaseobj.nim
index a967a509b..3499f5c1e 100644
--- a/tests/arc/tcaseobj.nim
+++ b/tests/arc/tcaseobj.nim
@@ -10,6 +10,7 @@ begin
 end
 prevented
 (ok: true, value: "ok")
+@[(kind: P, pChildren: @[])]
 myobj destroyed
 '''
 """
@@ -59,7 +60,7 @@ proc `=destroy`(o: var TMyObj) =
     o.p = nil
     echo "myobj destroyed"
 
-proc `=`(dst: var TMyObj, src: TMyObj) =
+proc `=copy`(dst: var TMyObj, src: TMyObj) =
   `=destroy`(dst)
   dst.p = alloc(src.len)
   dst.len = src.len
@@ -169,18 +170,24 @@ proc test_myobject =
   x.x1 = "x1"
   x.x2 = "x2"
   x.y1 = "ljhkjhkjh"
-  x.kind1 = true
+  {.cast(uncheckedAssign).}:
+    x.kind1 = true
   x.y2 = @["1", "2"]
-  x.kind2 = true
+  {.cast(uncheckedAssign).}:
+    x.kind2 = true
   x.z1 = "yes"
-  x.kind2 = false
+  {.cast(uncheckedAssign).}:
+    x.kind2 = false
   x.z2 = @["1", "2"]
-  x.kind2 = true
+  {.cast(uncheckedAssign).}:
+    x.kind2 = true
   x.z1 = "yes"
   x.kind2 = true # should be no effect
   doAssert(x.z1 == "yes")
-  x.kind2 = false
-  x.kind1 = x.kind2 # support self assignment with effect
+  {.cast(uncheckedAssign).}:
+    x.kind2 = false
+  {.cast(uncheckedAssign).}:
+    x.kind1 = x.kind2 # support self assignment with effect
 
   try:
     x.kind1 = x.flag # flag is not accesible
@@ -206,8 +213,9 @@ type
       error*: string
 
 proc init(): RocksDBResult[string] =
-  result.ok = true
-  result.value = "ok"
+  {.cast(uncheckedAssign).}:
+    result.ok = true
+    result.value = "ok"
 
 echo init()
 
@@ -221,7 +229,8 @@ type MyObj = object
     of true: x1: string
 
 var a = MyObj(kind: false, x0: 1234)
-a.kind = true
+{.cast(uncheckedAssign).}:
+  a.kind = true
 doAssert(a.x1 == "")
 
 block:
@@ -244,3 +253,114 @@ block:
 
   doAssert j1.x1 == 2
   doAssert j0.x0 == 2
+
+# ------------------------------------
+# bug #20305
+
+type
+  ContentNodeKind = enum
+    P, Br, Text
+  ContentNode = object
+    case kind: ContentNodeKind
+    of P: pChildren: seq[ContentNode]
+    of Br: discard
+    of Text: textStr: string
+
+proc bug20305 =
+  var x = ContentNode(kind: P, pChildren: @[
+    ContentNode(kind: P, pChildren: @[ContentNode(kind: Text, textStr: "brrr")])
+  ])
+  x.pChildren.add ContentNode(kind: Br)
+  x.pChildren.del(0)
+  {.cast(uncheckedAssign).}:
+    x.pChildren[0].kind = P
+  echo x.pChildren
+
+bug20305()
+
+# bug #21023
+block:
+  block:
+    type
+      MGErrorKind = enum
+        mgeUnexpected, mgeNotFound
+
+    type Foo = object
+      kind: MGErrorKind
+      ex: Exception
+
+    type Boo = object
+      a: seq[int]
+
+    type
+      Result2 = object
+        case o: bool
+        of false:
+          e: Foo
+        of true:
+          v: Boo
+
+    proc startSessionSync(): Result2 =
+      return Result2(o: true)
+
+    proc mainSync =
+      let ff = startSessionSync()
+      doAssert ff.o == true
+
+    mainSync()
+
+  block:
+    type
+      MGErrorKind = enum
+        mgeUnexpected, mgeNotFound
+
+    type Foo = object
+      kind: MGErrorKind
+      ex: Exception
+
+    type Boo = object
+      a: seq[int]
+
+    type
+      Result2 = object
+        case o: bool
+        of false:
+          e: Foo
+        of true:
+          v: Boo
+          s: int
+
+    proc startSessionSync(): Result2 =
+      return Result2(o: true, s: 12)
+
+    proc mainSync =
+      let ff = startSessionSync()
+      doAssert ff.s == 12
+
+    mainSync()
+
+import std/sequtils
+
+# bug #23690
+type
+  SomeObj* = object of RootObj
+
+  Item* = object
+    case kind*: 0..1
+    of 0:
+      a*: int
+      b*: SomeObj
+    of 1:
+      c*: string
+
+  ItemExt* = object
+    a*: Item
+    b*: string
+
+proc do1(x: int): seq[(string, Item)] =
+  result = @[("zero", Item(kind: 1, c: "first"))]
+
+proc do2(x: int, e: ItemExt): seq[(string, ItemExt)] =
+  do1(x).map(proc(v: (string, Item)): auto = (v[0], ItemExt(a: v[1], b: e.b)))
+
+doAssert $do2(0, ItemExt(a: Item(kind: 1, c: "second"), b: "third")) == """@[("zero", (a: (kind: 1, c: "first"), b: "third"))]"""
diff --git a/tests/arc/tcaseobjcopy.nim b/tests/arc/tcaseobjcopy.nim
index ed07b404e..fb26a4973 100644
--- a/tests/arc/tcaseobjcopy.nim
+++ b/tests/arc/tcaseobjcopy.nim
@@ -169,18 +169,23 @@ proc test_myobject =
   x.x1 = "x1"
   x.x2 = "x2"
   x.y1 = "ljhkjhkjh"
-  x.kind1 = true
+  {.cast(uncheckedAssign).}:
+    x.kind1 = true
   x.y2 = @["1", "2"]
-  x.kind2 = true
+  {.cast(uncheckedAssign).}:
+    x.kind2 = true
   x.z1 = "yes"
-  x.kind2 = false
+  {.cast(uncheckedAssign).}:
+    x.kind2 = false
   x.z2 = @["1", "2"]
-  x.kind2 = true
+  {.cast(uncheckedAssign).}:
+    x.kind2 = true
   x.z1 = "yes"
   x.kind2 = true # should be no effect
   doAssert(x.z1 == "yes")
-  x.kind2 = false
-  x.kind1 = x.kind2 # support self assignment with effect
+  {.cast(uncheckedAssign).}:
+    x.kind2 = false
+    x.kind1 = x.kind2 # support self assignment with effect
 
   try:
     x.kind1 = x.flag # flag is not accesible
@@ -206,7 +211,8 @@ type
       error*: string
 
 proc init(): RocksDBResult[string] =
-  result.ok = true
+  {.cast(uncheckedAssign).}:
+    result.ok = true
   result.value = "ok"
 
 echo init()
@@ -221,7 +227,8 @@ type MyObj = object
     of true: x1: string
 
 var a = MyObj(kind: false, x0: 1234)
-a.kind = true
+{.cast(uncheckedAssign).}:
+  a.kind = true
 doAssert(a.x1 == "")
 
 block:
diff --git a/tests/arc/tcomputedgoto.nim b/tests/arc/tcomputedgoto.nim
index 541a748c6..07487684a 100644
--- a/tests/arc/tcomputedgoto.nim
+++ b/tests/arc/tcomputedgoto.nim
@@ -1,16 +1,19 @@
 discard """
-  cmd: '''nim c --gc:arc $file'''
-  output: '''2
-2'''
+  cmd: '''nim c --mm:arc $file'''
+  output: '''
+2
+2
+destroyed
+'''
 """
 
 type
   ObjWithDestructor = object
     a: int
-proc `=destroy`(self: var ObjWithDestructor) =
+proc `=destroy`(self: ObjWithDestructor) =
   echo "destroyed"
 
-proc `=`(self: var ObjWithDestructor, other: ObjWithDestructor) =
+proc `=copy`(self: var ObjWithDestructor, other: ObjWithDestructor) =
   echo "copied"
 
 proc test(a: range[0..1], arg: ObjWithDestructor) =
@@ -38,4 +41,4 @@ proc test(a: range[0..1], arg: ObjWithDestructor) =
       if iteration == 2:
         break
 
-test(1, ObjWithDestructor())
\ No newline at end of file
+test(1, ObjWithDestructor())
diff --git a/tests/arc/tcomputedgotocopy.nim b/tests/arc/tcomputedgotocopy.nim
index 8337123ba..07487684a 100644
--- a/tests/arc/tcomputedgotocopy.nim
+++ b/tests/arc/tcomputedgotocopy.nim
@@ -1,13 +1,16 @@
 discard """
-  cmd: '''nim c --gc:arc $file'''
-  output: '''2
-2'''
+  cmd: '''nim c --mm:arc $file'''
+  output: '''
+2
+2
+destroyed
+'''
 """
 
 type
   ObjWithDestructor = object
     a: int
-proc `=destroy`(self: var ObjWithDestructor) =
+proc `=destroy`(self: ObjWithDestructor) =
   echo "destroyed"
 
 proc `=copy`(self: var ObjWithDestructor, other: ObjWithDestructor) =
diff --git a/tests/arc/tconst_to_sink.nim b/tests/arc/tconst_to_sink.nim
index ddcc46e67..25f659341 100644
--- a/tests/arc/tconst_to_sink.nim
+++ b/tests/arc/tconst_to_sink.nim
@@ -1,6 +1,7 @@
 discard """
   output: '''@[(s1: "333", s2: ""), (s1: "abc", s2: "def"), (s1: "3x", s2: ""), (s1: "3x", s2: ""), (s1: "3x", s2: ""), (s1: "3x", s2: ""), (s1: "lastone", s2: "")]'''
-  cmd: "nim c --gc:arc $file"
+  matrix: "--gc:arc"
+  targets: "c cpp"
 """
 
 # bug #13240
diff --git a/tests/arc/tcontrolflow.nim b/tests/arc/tcontrolflow.nim
index 80cc2b187..dbc115903 100644
--- a/tests/arc/tcontrolflow.nim
+++ b/tests/arc/tcontrolflow.nim
@@ -76,7 +76,7 @@ var c = Control(x: 7)
 
 run(c)
 
-proc sysFatal(exceptn: typedesc, message: string) {.inline, noreturn.} =
+proc sysFatal(exceptn: typedesc, message: string) {.inline.} =
   var buf = newStringOfCap(200)
   add(buf, "##")
   add(buf, message)
diff --git a/tests/arc/tcursor_field_obj_constr.nim b/tests/arc/tcursor_field_obj_constr.nim
new file mode 100644
index 000000000..b87f734bd
--- /dev/null
+++ b/tests/arc/tcursor_field_obj_constr.nim
@@ -0,0 +1,44 @@
+discard """
+  output: '''a
+b
+c'''
+  cmd: "nim c --gc:arc $file"
+"""
+
+# bug #18469
+
+type
+  Edge = object
+    neighbor {.cursor.}: Node
+
+  NodeObj = object
+    neighbors: seq[Edge]
+    label: string
+    visited: bool
+  Node = ref NodeObj
+
+  Graph = object
+    nodes: seq[Node]
+
+proc `=destroy`(x: var NodeObj) =
+  echo x.label
+  `=destroy`(x.neighbors)
+  `=destroy`(x.label)
+
+proc addNode(self: var Graph; label: string): Node =
+  self.nodes.add(Node(label: label))
+  result = self.nodes[^1]
+
+proc addEdge(self: Graph; source, neighbor: Node) =
+  source.neighbors.add(Edge(neighbor: neighbor))
+
+proc main =
+  var graph: Graph
+  let nodeA = graph.addNode("a")
+  let nodeB = graph.addNode("b")
+  let nodeC = graph.addNode("c")
+
+  graph.addEdge(nodeA, neighbor = nodeB)
+  graph.addEdge(nodeA, neighbor = nodeC)
+
+main()
diff --git a/tests/arc/tcursorloop.nim b/tests/arc/tcursorloop.nim
new file mode 100644
index 000000000..a37a6a036
--- /dev/null
+++ b/tests/arc/tcursorloop.nim
@@ -0,0 +1,45 @@
+discard """
+  cmd: '''nim c --gc:arc --expandArc:traverse --hint:Performance:off $file'''
+  nimout: '''
+--expandArc: traverse
+
+var
+  it
+  jt_cursor
+try:
+  `=copy`(it, root)
+  block :tmp:
+    while (
+      not (it == nil)):
+      if true:
+        echo [it.s]
+        `=copy`(it, it.ri)
+  jt_cursor = root
+  if (
+    not (jt_cursor == nil)):
+    echo [jt_cursor.s]
+    jt_cursor = jt_cursor.ri
+finally:
+  `=destroy`(it)
+-- end of expandArc ------------------------
+'''
+"""
+
+type
+  Node = ref object
+    le, ri: Node
+    s: string
+
+proc traverse(root: Node) =
+  var it = root
+  while it != nil:
+    if true:
+      echo it.s
+      it = it.ri
+
+  var jt = root
+  if jt != nil:
+    echo jt.s
+    jt = jt.ri
+
+traverse(nil)
diff --git a/tests/arc/tcustomtrace.nim b/tests/arc/tcustomtrace.nim
new file mode 100644
index 000000000..5e0ecfb24
--- /dev/null
+++ b/tests/arc/tcustomtrace.nim
@@ -0,0 +1,240 @@
+discard """
+  outputsub: '''1
+2
+3
+4
+5
+6
+89
+90
+90
+0 0 1
+0 1 2
+0 2 3
+1 0 4
+1 1 5
+1 2 6
+1 3 7
+after 6 6
+MEM 0'''
+joinable: false
+  cmd: "nim c --gc:orc -d:useMalloc $file"
+  valgrind: "true"
+"""
+
+import typetraits
+
+type
+  myseq*[T] = object
+    len, cap: int
+    data: ptr UncheckedArray[T]
+
+# XXX make code memory safe for overflows in '*'
+var
+  allocCount, deallocCount: int
+
+proc `=destroy`*[T](x: var myseq[T]) =
+  if x.data != nil:
+    when not supportsCopyMem(T):
+      for i in 0..<x.len: `=destroy`(x[i])
+    dealloc(x.data)
+    inc deallocCount
+    x.data = nil
+    x.len = 0
+    x.cap = 0
+
+proc `=copy`*[T](a: var myseq[T]; b: myseq[T]) =
+  if a.data == b.data: return
+  if a.data != nil:
+    `=destroy`(a)
+    #dealloc(a.data)
+    #inc deallocCount
+    #a.data = nil
+  a.len = b.len
+  a.cap = b.cap
+  if b.data != nil:
+    a.data = cast[type(a.data)](alloc(a.cap * sizeof(T)))
+    inc allocCount
+    when supportsCopyMem(T):
+      copyMem(a.data, b.data, a.cap * sizeof(T))
+    else:
+      for i in 0..<a.len:
+        a.data[i] = b.data[i]
+
+proc `=sink`*[T](a: var myseq[T]; b: myseq[T]) =
+  if a.data != nil and a.data != b.data:
+    dealloc(a.data)
+    inc deallocCount
+  a.len = b.len
+  a.cap = b.cap
+  a.data = b.data
+
+proc `=trace`*[T](x: var myseq[T]; env: pointer) =
+  if x.data != nil:
+    for i in 0..<x.len: `=trace`(x[i], env)
+
+proc resize[T](s: var myseq[T]) =
+  let oldCap = s.cap
+  if oldCap == 0: s.cap = 8
+  else: s.cap = (s.cap * 3) shr 1
+  if s.data == nil: inc allocCount
+  s.data = cast[typeof(s.data)](realloc0(s.data, oldCap * sizeof(T), s.cap * sizeof(T)))
+
+proc reserveSlot[T](x: var myseq[T]): ptr T =
+  if x.len >= x.cap: resize(x)
+  result = addr(x.data[x.len])
+  inc x.len
+
+template add*[T](x: var myseq[T]; y: T) =
+  reserveSlot(x)[] = y
+
+proc shrink*[T](x: var myseq[T]; newLen: int) =
+  assert newLen <= x.len
+  assert newLen >= 0
+  when not supportsCopyMem(T):
+    for i in countdown(x.len - 1, newLen - 1):
+      `=destroy`(x.data[i])
+  x.len = newLen
+
+proc grow*[T](x: var myseq[T]; newLen: int; value: T) =
+  if newLen <= x.len: return
+  assert newLen >= 0
+  let oldCap = x.cap
+  if oldCap == 0: x.cap = newLen
+  else: x.cap = max(newLen, (oldCap * 3) shr 1)
+  if x.data == nil: inc allocCount
+  x.data = cast[type(x.data)](realloc0(x.data, oldCap * sizeof(T), x.cap * sizeof(T)))
+  for i in x.len..<newLen:
+    x.data[i] = value
+  x.len = newLen
+
+template default[T](t: typedesc[T]): T =
+  var v: T
+  v
+
+proc setLen*[T](x: var myseq[T]; newLen: int) {.deprecated.} =
+  if newlen < x.len: shrink(x, newLen)
+  else: grow(x, newLen, default(T))
+
+template `[]`*[T](x: myseq[T]; i: Natural): T =
+  assert i < x.len
+  x.data[i]
+
+template `[]=`*[T](x: myseq[T]; i: Natural; y: T) =
+  assert i < x.len
+  x.data[i] = y
+
+proc createSeq*[T](elems: varargs[T]): myseq[T] =
+  result.cap = max(elems.len, 2)
+  result.len = elems.len
+  result.data = cast[type(result.data)](alloc0(result.cap * sizeof(T)))
+  inc allocCount
+  when supportsCopyMem(T):
+    copyMem(result.data, addr(elems[0]), result.cap * sizeof(T))
+  else:
+    for i in 0..<result.len:
+      result.data[i] = elems[i]
+
+proc len*[T](x: myseq[T]): int {.inline.} = x.len
+
+proc main =
+  var s = createSeq(1, 2, 3, 4, 5, 6)
+  s.add 89
+  s.grow s.len + 2, 90
+  for i in 0 ..< s.len:
+    echo s[i]
+
+  var nested = createSeq(createSeq(1, 2, 3), createSeq(4, 5, 6, 7))
+  for i in 0 ..< nested.len:
+    for j in 0 ..< nested[i].len:
+      echo i, " ", j, " ", nested[i][j]
+
+main()
+echo "after ", allocCount, " ", deallocCount
+
+type
+  Node = ref object
+    name: char
+    sccId: int
+    kids: myseq[Node]
+    rc: int
+
+proc edge(a, b: Node) =
+  inc b.rc
+  a.kids.add b
+
+proc createNode(name: char): Node =
+  new result
+  result.name = name
+  result.kids = createSeq[Node]()
+
+proc use(x: Node) = discard
+
+proc buildComplexGraph: Node =
+  # see https://en.wikipedia.org/wiki/Strongly_connected_component for the
+  # graph:
+  let a = createNode('a')
+  let b = createNode('b')
+  let c = createNode('c')
+  let d = createNode('d')
+  let e = createNode('e')
+
+  a.edge c
+  c.edge b
+  c.edge e
+  b.edge a
+  d.edge c
+  e.edge d
+
+
+  let f = createNode('f')
+  b.edge f
+  e.edge f
+
+  let g = createNode('g')
+  let h = createNode('h')
+  let i = createNode('i')
+
+  f.edge g
+  f.edge i
+  g.edge h
+  h.edge i
+  i.edge g
+
+  let j = createNode('j')
+
+  h.edge j
+  i.edge j
+
+  let k = createNode('k')
+  let l = createNode('l')
+
+  f.edge k
+  k.edge l
+  l.edge k
+  k.edge j
+
+  let m = createNode('m')
+  let n = createNode('n')
+  let p = createNode('p')
+  let q = createNode('q')
+
+  m.edge n
+  n.edge p
+  n.edge q
+  q.edge p
+  p.edge m
+
+  q.edge k
+
+  d.edge m
+  e.edge n
+
+  result = a
+
+proc main2 =
+  let g = buildComplexGraph()
+
+main2()
+GC_fullCollect()
+echo "MEM ", getOccupiedMem()
diff --git a/tests/arc/tdup.nim b/tests/arc/tdup.nim
new file mode 100644
index 000000000..61f262a68
--- /dev/null
+++ b/tests/arc/tdup.nim
@@ -0,0 +1,71 @@
+discard """
+  cmd: "nim c --mm:arc --expandArc:foo --hints:off $file"
+  nimout: '''
+--expandArc: foo
+
+var
+  x
+  :tmpD
+  s
+  :tmpD_1
+x = Ref(id: 8)
+inc:
+  :tmpD = `=dup`(x)
+  :tmpD
+inc:
+  let blitTmp = x
+  blitTmp
+var id_1 = 777
+s = RefCustom(id_2: addr(id_1))
+inc_1 :
+  :tmpD_1 = `=dup_1`(s)
+  :tmpD_1
+inc_1 :
+  let blitTmp_1 = s
+  blitTmp_1
+-- end of expandArc ------------------------
+'''
+"""
+
+type
+  Ref = ref object
+    id: int
+
+  RefCustom = object
+    id: ptr int
+
+proc `=dup`(x: RefCustom): RefCustom =
+  result.id = x.id
+
+proc inc(x: sink Ref) =
+  inc x.id
+
+proc inc(x: sink RefCustom) =
+  inc x.id[]
+
+
+proc foo =
+  var x = Ref(id: 8)
+  inc(x)
+  inc(x)
+  var id = 777
+  var s = RefCustom(id: addr id)
+  inc s
+  inc s
+
+foo()
+
+proc foo2 =
+  var x = Ref(id: 8)
+  inc(x)
+  doAssert x.id == 9
+  inc(x)
+  doAssert x.id == 10
+  var id = 777
+  var s = RefCustom(id: addr id)
+  inc s
+  doAssert s.id[] == 778
+  inc s
+  doAssert s.id[] == 779
+
+foo2()
diff --git a/tests/arc/texplicit_sink.nim b/tests/arc/texplicit_sink.nim
new file mode 100644
index 000000000..4b021ed62
--- /dev/null
+++ b/tests/arc/texplicit_sink.nim
@@ -0,0 +1,29 @@
+discard """
+  output: '''de'''
+  cmd: '''nim c --mm:arc --expandArc:main $file'''
+  nimout: '''--expandArc: main
+
+var
+  a
+  b_cursor
+try:
+  a = f "abc"
+  b_cursor = "de"
+  `=sink`(a, b_cursor)
+  echo [a]
+finally:
+  `=destroy`(a)
+-- end of expandArc ------------------------'''
+"""
+
+# bug #20572
+
+proc f(s: string): string = s
+
+proc main =
+  var a = f "abc"
+  var b = "de"
+  `=sink`(a, b)
+  echo a
+
+main()
diff --git a/tests/arc/tfuncobj.nim b/tests/arc/tfuncobj.nim
new file mode 100644
index 000000000..50cd9425e
--- /dev/null
+++ b/tests/arc/tfuncobj.nim
@@ -0,0 +1,38 @@
+discard """
+  outputsub: '''f1
+f2
+f3'''
+  cmd: "nim c --gc:orc $file"
+  valgrind: true
+"""
+
+type
+  FuncObj = object
+    fn: proc (env: pointer) {.cdecl.}
+    env: pointer
+
+proc `=destroy`(x: var FuncObj) =
+  GC_unref(cast[RootRef](x.env))
+
+proc `=copy`(x: var FuncObj, y: FuncObj) {.error.}
+
+# bug #18433
+
+proc main =
+  var fs: seq[FuncObj]
+
+  proc wrap(p: proc()) =
+    proc closeOver() = p()
+    let env = rawEnv closeOver
+    GC_ref(cast[RootRef](env))
+    fs.add(FuncObj(fn: cast[proc(env: pointer){.cdecl.}](rawProc closeOver), env: env))
+
+  wrap(proc() {.closure.} = echo "f1")
+  wrap(proc() {.closure.} = echo "f2")
+  wrap(proc() {.closure.} = echo "f3")
+
+  for a in fs:
+    a.fn(a.env)
+
+main()
+
diff --git a/tests/arc/thamming_orc.nim b/tests/arc/thamming_orc.nim
new file mode 100644
index 000000000..777efb38e
--- /dev/null
+++ b/tests/arc/thamming_orc.nim
@@ -0,0 +1,155 @@
+discard """
+  output: '''(allocCount: 1114, deallocCount: 1112)
+created 491 destroyed 491'''
+  cmd: "nim c --gc:orc -d:nimAllocStats $file"
+"""
+
+# bug #18421
+
+# test Nim Hamming Number Lazy List algo with reference counts and not...
+# compile with "-d:release -d:danger" and test with various
+# memory managment GC's, allocators, threading, etc.
+# it should be guaranteed to work with zero memory leaks with `--gc:orc`...
+
+# compile with `-d:trace20` to trace creation and destruction of first 20 values.
+
+from math import log2
+
+# implement our own basic BigInt so the bigints library isn't necessary...
+type
+  BigInt = object
+    digits: seq[uint32]
+let zeroBigInt = BigInt(digits: @[ 0'u32 ])
+let oneBigInt = BigInt(digits: @[ 1'u32 ])
+
+proc shladd(bi: var BigInt; n: int; a: BigInt) =
+  # assume that both `bi` and `a` are sized correctly with
+  # msuint32 for both not containing a zero
+  let alen = a.digits.len
+  let mx = max(bi.digits.len, a.digits.len)
+  for i in bi.digits.len ..< mx: bi.digits.add 0'u32
+  var cry = 0'u64
+  for i in 0 ..< alen:
+    cry += (bi.digits[i].uint64 shl n) + a.digits[i].uint64
+    bi.digits[i] = cry.uint32; cry = cry shr 32
+  for i in alen ..< mx:
+    cry += bi.digits[i].uint64 shl n
+    bi.digits[i] = cry.uint32; cry = cry shr 32
+  if cry > 0'u64:
+    bi.digits.add cry.uint32
+
+proc `$`(x: BigInt): string =
+  if x.digits.len == 0 or (x.digits.len == 1 and x.digits[0] == 0'u32):
+    return "0"
+  result = ""; var n = x; var msd = n.digits.high
+  while msd >= 0:
+    if n.digits[msd] == 0'u32: msd.dec; continue
+    var brw = 0.uint64
+    for i in countdown(msd, 0):
+      let dvdnd = n.digits[i].uint64 + (brw shl 32)
+      let q = dvdnd div 10'u64; brw = dvdnd - q * 10'u64
+      n.digits[i] = q.uint32
+    result &= $brw
+  for i in 0 .. result.high shr 1: # reverse result string in place
+    let tmp = result[^(i + 1)]
+    result[^(i + 1)] = result[i]
+    result[i] = tmp
+
+type TriVal = (uint32, uint32, uint32)
+type LogRep = (float64, TriVal)
+type LogRepf = proc(x: LogRep): LogRep
+const one: LogRep = (0.0'f64, (0'u32, 0'u32, 0'u32))
+proc `<`(me: LogRep, othr: LogRep): bool = me[0] < othr[0]
+
+proc convertTriVal2BigInt(tpl: TriVal): BigInt =
+  result = oneBigInt
+  let (x2, x3, x5) = tpl
+  for _ in 1 .. x2: result.shladd 1, zeroBigInt
+  for _ in 1 .. x3: result.shladd 1, result
+  for _ in 1 .. x5: result.shladd 2, result
+
+const lb2 = 1.0'f64
+const lb3 = 3.0'f64.log2
+const lb5 = 5.0'f64.log2
+
+proc mul2(me: LogRep): LogRep =
+  let (lr, tpl) = me; let (x2, x3, x5) = tpl
+  (lr + lb2, (x2 + 1, x3, x5))
+
+proc mul3(me: LogRep): LogRep =
+  let (lr, tpl) = me; let (x2, x3, x5) = tpl
+  (lr + lb3, (x2, x3 + 1, x5))
+
+proc mul5(me: LogRep): LogRep =
+  let (lr, tpl) = me; let (x2, x3, x5) = tpl
+  (lr + lb5, (x2, x3, x5 + 1))
+
+type
+  LazyListObj = object
+    hd: LogRep
+    tlf: proc(): LazyList {.closure.}
+    tl: LazyList
+  LazyList = ref LazyListObj
+
+var destroyed = 0
+
+proc `=destroy`(ll: var LazyListObj) =
+  destroyed += 1
+  if ll.tlf == nil and ll.tl == nil: return
+
+  when defined(trace20):
+    echo "destroying:  ", (destroyed, ll.hd[1].convertTriVal2BigInt)
+  if ll.tlf != nil: ll.tlf.`=destroy`
+  if ll.tl != nil: ll.tl.`=destroy`
+  #wasMoved(ll)
+
+proc rest(ll: LazyList): LazyList = # not thread-safe; needs lock on thunk
+  if ll.tlf != nil: ll.tl = ll.tlf(); ll.tlf = nil
+  ll.tl
+
+var created = 0
+iterator hammings(until: int): TriVal =
+  proc merge(x, y: LazyList): LazyList =
+    let xh = x.hd; let yh = y.hd; created += 1
+    when defined(trace20):
+      echo "merge create:  ", (created - 1, (if xh < yh: xh else: yh)[1].convertTriVal2BigInt)
+    if xh < yh: LazyList(hd: xh, tlf: proc(): auto = merge x.rest, y)
+    else: LazyList(hd: yh, tlf: proc(): auto = merge x, y.rest)
+  proc smult(mltf: LogRepf; s: LazyList): LazyList =
+    proc smults(ss: LazyList): LazyList =
+      when defined(trace20):
+        echo "mult create:  ", (created, ss.hd.mltf[1].convertTriVal2BigInt)
+      created += 1; LazyList(hd: ss.hd.mltf, tlf: proc(): auto = ss.rest.smults)
+    s.smults
+  proc unnsm(s: LazyList, mltf: LogRepf): LazyList =
+    var r: LazyList = nil
+    when defined(trace20):
+      echo "first create:  ", (created, one[1].convertTriVal2BigInt)
+    let frst = LazyList(hd: one, tlf: proc(): LazyList = r); created += 1
+    r = if s == nil: smult(mltf, frst) else: s.merge smult(mltf, frst)
+    r
+  yield one[1]
+  var hmpll: LazyList = ((nil.unnsm mul5).unnsm mul3).unnsm mul2
+  for _ in 2 .. until:
+    yield hmpll.hd[1]; hmpll = hmpll.rest # almost forever
+
+proc main =
+  var s = ""
+  for h in hammings(20): s &= $h.convertTrival2BigInt & " "
+  doAssert s == "1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 25 27 30 32 36 ",
+           "Algorithmic error finding first 20 Hamming numbers!!!"
+
+  when not defined(trace20):
+    var lsth: TriVal
+    for h in hammings(200): lsth = h
+    doAssert $lsth.convertTriVal2BigInt == "16200",
+             "Algorithmic error finding 200th Hamming number!!!"
+
+let mem = getOccupiedMem()
+main()
+GC_FullCollect()
+let mb = getOccupiedMem() - mem
+doAssert mb == 0, "Found memory leak of " & $mb & " bytes!!!"
+
+echo getAllocStats()
+echo "created ", created, " destroyed ", destroyed
diff --git a/tests/arc/thard_alignment.nim b/tests/arc/thard_alignment.nim
index e644572f0..30cfddb05 100644
--- a/tests/arc/thard_alignment.nim
+++ b/tests/arc/thard_alignment.nim
@@ -1,9 +1,11 @@
 discard """
 disabled: "arm64"
-cmd: "nim c --gc:arc $file"
+cmd: "nim c --mm:arc -u:nimPreviewNonVarDestructor $file"
 output: "y"
 """
 
+# TODO: fixme: investigate why it failed with non-var destructors
+
 {.passC: "-march=native".}
 
 proc isAlignedCheck(p: pointer, alignment: int) = 
@@ -18,7 +20,7 @@ type
 proc set1(x: float): m256d {.importc: "_mm256_set1_pd", header: "immintrin.h".}
 func `+`(a,b: m256d): m256d {.importc: "_mm256_add_pd", header: "immintrin.h".}
 proc `$`(a: m256d): string =  
-  result = $(cast[ptr float](a.unsafeAddr)[])
+  result = $(cast[ptr float](a.addr)[])
 
 
 var res: seq[seq[m256d]]
diff --git a/tests/arc/titeration_doesnt_copy.nim b/tests/arc/titeration_doesnt_copy.nim
new file mode 100644
index 000000000..e510a6eff
--- /dev/null
+++ b/tests/arc/titeration_doesnt_copy.nim
@@ -0,0 +1,67 @@
+discard """
+  output: "true"
+"""
+
+type
+  Idx = object
+    i: int
+  Node = object
+    n: int
+    next: seq[Idx]
+  FooBar = object
+    s: seq[Node]
+
+proc `=copy`(dest: var Idx; source: Idx) {.error.}
+proc `=copy`(dest: var Node; source: Node) {.error.}
+proc `=copy`(dest: var FooBar; source: FooBar) {.error.}
+
+proc doSomething(ss: var seq[int], s: FooBar) =
+  for i in 0 .. s.s.len-1:
+    for elm in items s.s[i].next:
+      ss.add s.s[elm.i].n
+
+when isMainModule:
+  const foo = FooBar(s: @[Node(n: 1, next: @[Idx(i: 0)])])
+  var ss: seq[int]
+  doSomething(ss, foo)
+  echo ss == @[1]
+
+from sequtils import mapIt
+from strutils import join
+
+proc toBinSeq*(b: uint8): seq[uint8] =
+  ## Return binary sequence from each bits of uint8.
+  runnableExamples:
+    from sequtils import repeat
+    doAssert 0'u8.toBinSeq == 0'u8.repeat(8)
+    doAssert 0b1010_1010.toBinSeq == @[1'u8, 0, 1, 0, 1, 0, 1, 0]
+  result = @[]
+  var c = b
+  for i in 1..8:
+    result.add (uint8(c and 0b1000_0000) shr 7)
+    c = c shl 1
+
+proc toBinString*(data: openArray[uint8], col: int): string =
+  ## Return binary string from each bits of uint8.
+  runnableExamples:
+    doAssert @[0b0000_1111'u8, 0b1010_1010].toBinString(8) == "0000111110101010"
+    doAssert @[0b1000_0000'u8, 0b0000_0000].toBinString(1) == "10"
+  result = ""
+  for b in items data.mapIt(it.toBinSeq.mapIt(it.`$`[0].char)):
+    for i, c in b:
+      if i < col:
+        result.add c
+
+doAssert @[0b0000_1111'u8, 0b1010_1010].toBinString(8) == "0000111110101010"
+doAssert @[0b1000_0000'u8, 0b0000_0000].toBinString(1) == "10"
+
+block: # bug #23982
+  iterator `..`(a, b: ptr int16): ptr int16 = discard
+  var a: seq[int16] #; let p = a[0].addr
+  var b: seq[ptr int16]
+
+  try:
+    for x in a[0].addr .. b[1]: # `p .. b[1]` works
+      discard
+  except IndexDefect:
+    discard
diff --git a/tests/arc/tkeys_lent.nim b/tests/arc/tkeys_lent.nim
new file mode 100644
index 000000000..2c92350b1
--- /dev/null
+++ b/tests/arc/tkeys_lent.nim
@@ -0,0 +1,17 @@
+discard """
+  output: '''{"string": 2}'''
+  cmd: "nim c --gc:orc $file"
+"""
+
+import tables
+
+proc use(x: int) = echo x
+
+proc main =
+  var tab = {"string": 1}.toTable
+  for keyAAA in tab.keys():
+    template alias(): untyped = tab[keyAAA]
+    alias() = 2
+  echo tab
+
+main()
diff --git a/tests/arc/tmalloc.nim b/tests/arc/tmalloc.nim
new file mode 100644
index 000000000..1d72646c8
--- /dev/null
+++ b/tests/arc/tmalloc.nim
@@ -0,0 +1,16 @@
+discard """
+  matrix: "--mm:arc -d:useMalloc; --mm:arc"
+"""
+
+block: # bug #22058
+  template foo(): auto =
+    {.noSideEffect.}:
+      newSeq[byte](1)
+
+  type V = object
+    v: seq[byte]
+
+  proc bar(): V =
+    V(v: foo())
+
+  doAssert bar().v == @[byte(0)]
diff --git a/tests/arc/tmove_regression.nim b/tests/arc/tmove_regression.nim
new file mode 100644
index 000000000..7d9a867c3
--- /dev/null
+++ b/tests/arc/tmove_regression.nim
@@ -0,0 +1,22 @@
+discard """
+  output: '''/1/2
+/1
+/
+'''
+""""
+
+# bug #22001
+
+import std / [os, strutils]
+
+proc finOp2(path, name: string): (string, File) = # Find & open FIRST `name`
+  var current = path
+  while true:
+    if current.isRootDir: break # <- current=="" => current.isRootDir
+    current = current.parentDir
+    let dir = current
+    echo dir.replace('\\', '/')  # Commenting out try/except below hides bug
+    try: result[0] = dir/name; result[1] = open(result[0]); return
+    except CatchableError: discard
+
+discard finOp2("/1/2/3", "4")  # All same if this->inside a proc
diff --git a/tests/arc/tmovebug.nim b/tests/arc/tmovebug.nim
index 888027186..8ad7c955c 100644
--- a/tests/arc/tmovebug.nim
+++ b/tests/arc/tmovebug.nim
@@ -93,6 +93,7 @@ destroy
 destroy
 destroy
 sink
+sink
 destroy
 copy
 (f: 1)
@@ -107,6 +108,8 @@ sink
 destroy
 copy
 destroy
+(f: 1)
+destroy
 '''
 """
 
@@ -290,7 +293,7 @@ when false:
 
 # bug #13456
 
-iterator combinations[T](s: openarray[T], k: int): seq[T] =
+iterator combinations[T](s: openArray[T], k: int): seq[T] =
   let n = len(s)
   assert k >= 0 and k <= n
   var pos = newSeq[int](k)
@@ -453,7 +456,7 @@ initFoo7(2)
 
 
 # bug #14902
-iterator zip[T](s: openarray[T]): (T, T) =
+iterator zip[T](s: openArray[T]): (T, T) =
   var i = 0
   while i < 10:
     yield (s[i mod 2], s[i mod 2 + 1])
@@ -765,8 +768,74 @@ proc initC(): C =
   C(o: initO())
 
 proc pair(): tuple[a: C, b: C] =
-  result.a = initC() # <- when firstWrite tries to find this node to start its analysis it fails, because injectdestructors uses copyTree/shallowCopy
-  result.b = initC()
+  result = (a: initC(), b: initC())# <- when firstWrite tries to find this node to start its analysis it fails, because injectdestructors uses copyTree/shallowCopy
 
 discard pair()
 
+
+# bug #17450
+proc noConsume(x: OO) {.nosinks.} = echo x
+
+proc main3 =
+  var i = 1
+  noConsume:
+    block:
+      OO(f: i)
+
+main3()
+
+# misc
+proc smoltest(x: bool): bool =
+  while true:
+    if true: return x
+
+discard smoltest(true)
+
+# bug #18002
+type
+  TTypeAttachedOp = enum
+    attachedAsgn
+    attachedSink
+    attachedTrace
+
+  PNode = ref object
+    discard
+
+proc genAddrOf(n: PNode) =
+  assert n != nil, "moved?!"
+
+proc atomicClosureOp =
+  let x = PNode()
+
+  genAddrOf:
+    block:
+      x
+
+  case attachedTrace
+  of attachedSink: discard
+  of attachedAsgn: discard
+  of attachedTrace: genAddrOf(x)
+
+atomicClosureOp()
+
+
+template assertEq(a, b: untyped): untyped =
+  block:
+    let
+      aval = a
+      bval = b
+
+    if aval != bval:
+      quit "bug!"
+
+proc convoluted =
+  let _ = (;
+    var val1: string;
+    if true: val1 = "22"
+    true
+  )
+
+  assertEq val1, "22"
+  assertEq val1, "22"
+
+convoluted()
diff --git a/tests/arc/tmovebugcopy.nim b/tests/arc/tmovebugcopy.nim
index 7c5228147..ec4315777 100644
--- a/tests/arc/tmovebugcopy.nim
+++ b/tests/arc/tmovebugcopy.nim
@@ -253,7 +253,7 @@ when false:
 
 # bug #13456
 
-iterator combinations[T](s: openarray[T], k: int): seq[T] =
+iterator combinations[T](s: openArray[T], k: int): seq[T] =
   let n = len(s)
   assert k >= 0 and k <= n
   var pos = newSeq[int](k)
@@ -416,7 +416,7 @@ initFoo7(2)
 
 
 # bug #14902
-iterator zip[T](s: openarray[T]): (T, T) =
+iterator zip[T](s: openArray[T]): (T, T) =
   var i = 0
   while i < 10:
     yield (s[i mod 2], s[i mod 2 + 1])
diff --git a/tests/arc/tnewseq_legacy.nim b/tests/arc/tnewseq_legacy.nim
new file mode 100644
index 000000000..4730d2c2b
--- /dev/null
+++ b/tests/arc/tnewseq_legacy.nim
@@ -0,0 +1,13 @@
+discard """
+  output: "(allocCount: 201, deallocCount: 201)"
+  cmd: "nim c --gc:orc -d:nimAllocStats $file"
+"""
+
+proc main(prefix: string) =
+  var c: seq[string]
+  for i in 0..<100:
+    newSeq(c, 100)
+    c[i] = prefix & $i
+
+main("abc")
+echo getAllocStats()
diff --git a/tests/arc/topenarray.nim b/tests/arc/topenarray.nim
new file mode 100644
index 000000000..ba91666ba
--- /dev/null
+++ b/tests/arc/topenarray.nim
@@ -0,0 +1,86 @@
+discard """
+  input: "hi"
+  output: '''
+hi
+Nim
+'''
+  matrix: "--gc:arc -d:useMalloc; --gc:arc"
+"""
+{.experimental: "views".}
+
+block: # bug 18627
+  proc setPosition(params: openArray[string]) =
+    for i in params.toOpenArray(0, params.len - 1):
+      echo i
+
+  proc uciLoop() =
+    let params = @[readLine(stdin)]
+    setPosition(params)
+
+  uciLoop()
+
+  proc uciLoop2() =
+    let params = @["Nim"]
+    for i in params.toOpenArray(0, params.len - 1):
+      echo i
+  uciLoop2()
+
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
+block: # bug #20954
+  block:
+    doAssertRaises(IndexDefect):
+      var v: array[10, int]
+
+      echo len(toOpenArray(v, 20, 30))
+
+  block:
+    doAssertRaises(IndexDefect):
+      var v: seq[int]
+
+      echo len(toOpenArray(v, 20, 30))
+
+# bug #20422
+
+proc f(a: var string) =
+  var v = a.toOpenArray(1, 3)
+  v[0] = 'a'
+
+var a = "Hello"
+f(a)
+doAssert a == "Hallo"
+
+# bug #22132
+block:
+  func foo[T](arr: openArray[T], idx: int = arr.low): string =
+    doAssert idx == 0
+    return $arr
+
+  let bug = ["0", "c", "a"]
+
+  let str = foo(bug)
+
+  const expected = """["0", "c", "a"]"""
+  doAssert str == expected
+
+  const noBugConst = ["0", "c", "a"]
+  doAssert foo(noBugConst) == expected
+  let noBugSeq = @["0", "c", "a"]
+  doAssert foo(noBugSeq) == expected
+
+block: # bug #20865
+  var p: pointer
+  var x: array[0, int]
+  # echo toOpenArray(x, 0, 1)[0] # Raises IndexDefect
+  doAssertRaises(IndexDefect):
+    echo toOpenArray(cast[ptr array[0, int]](p)[], 0, 1)[0] # Does not raise IndexDefect
+
+block: # bug #20987
+  var v: array[1, byte]
+
+  var p = cast[ptr array[0, byte]](addr v)
+
+  doAssertRaises(IndexDefect):
+    echo toOpenArray(p[], 1, 2)
+
diff --git a/tests/arc/topt_cursor.nim b/tests/arc/topt_cursor.nim
index 5c35b454f..794132921 100644
--- a/tests/arc/topt_cursor.nim
+++ b/tests/arc/topt_cursor.nim
@@ -12,7 +12,7 @@ try:
     x_cursor = ("different", 54) else:
     x_cursor = ("string here", 80)
   echo [
-    :tmpD = `$`(x_cursor)
+    :tmpD = `$$`(x_cursor)
     :tmpD]
 finally:
   `=destroy`(:tmpD)
diff --git a/tests/arc/topt_no_cursor.nim b/tests/arc/topt_no_cursor.nim
index f1eb8575a..0a4984a69 100644
--- a/tests/arc/topt_no_cursor.nim
+++ b/tests/arc/topt_no_cursor.nim
@@ -1,34 +1,24 @@
 discard """
-  output: '''(repo: "", package: "meo", ext: "")
-doing shady stuff...
-3
-6
-(@[1], @[2])
-192.168.0.1
-192.168.0.1
-192.168.0.1
-192.168.0.1'''
-  cmd: '''nim c --gc:arc --expandArc:newTarget --expandArc:delete --expandArc:p1 --expandArc:tt --hint:Performance:off --assertions:off --expandArc:extractConfig $file'''
-  nimout: '''--expandArc: newTarget
+  nimoutFull: true
+  cmd: '''nim c -r --warnings:off --hints:off --mm:arc --expandArc:newTarget --expandArc:delete --expandArc:p1 --expandArc:tt --hint:Performance:off --assertions:off --expandArc:extractConfig --expandArc:mergeShadowScope --expandArc:check $file'''
+  nimout: '''
+--expandArc: newTarget
 
 var
   splat
   :tmp
   :tmp_1
-  :tmp_2
-splat = splitFile(path)
-:tmp = splat.dir
-wasMoved(splat.dir)
-:tmp_1 = splat.name
-wasMoved(splat.name)
-:tmp_2 = splat.ext
-wasMoved(splat.ext)
+splat = splitDrive do:
+  let blitTmp = path
+  blitTmp
+:tmp = splat.drive
+`=wasMoved`(splat.drive)
+:tmp_1 = splat.path_1
+`=wasMoved`(splat.path_1)
 result = (
-  let blitTmp = :tmp
-  blitTmp,
-  let blitTmp_1 = :tmp_1
+  let blitTmp_1 = :tmp
   blitTmp_1,
-  let blitTmp_2 = :tmp_2
+  let blitTmp_2 = :tmp_1
   blitTmp_2)
 `=destroy`(splat)
 -- end of expandArc ------------------------
@@ -49,14 +39,14 @@ var
   lresult
   lvalue
   lnext
-  _
+  tmpTupleAsgn
 lresult = @[123]
-_ = (
+tmpTupleAsgn = (
   let blitTmp = lresult
   blitTmp, ";")
-lvalue = _[0]
-lnext = _[1]
-result.value = move lvalue
+lvalue = tmpTupleAsgn[0]
+lnext = tmpTupleAsgn[1]
+`=sink`(result.value, move lvalue)
 `=destroy`(lnext)
 `=destroy_1`(lvalue)
 -- end of expandArc ------------------------
@@ -71,14 +61,12 @@ var
 try:
   it_cursor = x
   a = (
-    wasMoved(:tmpD)
-    `=copy`(:tmpD, it_cursor.key)
+    :tmpD = `=dup`(it_cursor.key)
     :tmpD,
-    wasMoved(:tmpD_1)
-    `=copy`(:tmpD_1, it_cursor.val)
+    :tmpD_1 = `=dup`(it_cursor.val)
     :tmpD_1)
   echo [
-    :tmpD_2 = `$`(a)
+    :tmpD_2 = `$$`(a)
     :tmpD_2]
 finally:
   `=destroy`(:tmpD_2)
@@ -103,21 +91,85 @@ try:
             `=copy`(lan_ip, splitted[1])
           echo [lan_ip]
           echo [splitted[1]]
+          {.push, overflowChecks: false.}
           inc(i, 1)
+          {.pop.}
         finally:
           `=destroy`(splitted)
 finally:
   `=destroy_1`(lan_ip)
--- end of expandArc ------------------------'''
+-- end of expandArc ------------------------
+--expandArc: mergeShadowScope
+
+var shadowScope
+`=copy`(shadowScope, c.currentScope)
+rawCloseScope(c)
+block :tmp:
+  var sym
+  var i = 0
+  let L = len(shadowScope.symbols)
+  block :tmp_1:
+    while i < L:
+      var :tmpD
+      sym = shadowScope.symbols[i]
+      addInterfaceDecl(c):
+        :tmpD = `=dup`(sym)
+        :tmpD
+      {.push, overflowChecks: false.}
+      inc(i, 1)
+      {.pop.}
+`=destroy`(shadowScope)
+-- end of expandArc ------------------------
+--expandArc: check
+
+var par
+this.isValid = fileExists(this.value)
+if dirExists(this.value):
+  var :tmpD
+  par = (dir:
+    :tmpD = `=dup`(this.value)
+    :tmpD, front: "") else:
+  var
+    :tmpD_1
+    :tmpD_2
+    :tmpD_3
+  par = (dir_1: parentDir(this.value), front_1:
+    :tmpD_1 = `=dup`(
+      :tmpD_3 = splitDrive do:
+        :tmpD_2 = `=dup`(this.value)
+        :tmpD_2
+      :tmpD_3.path)
+    :tmpD_1)
+  `=destroy`(:tmpD_3)
+if dirExists(par.dir):
+  `=sink`(this.matchDirs, getSubDirs(par.dir, par.front))
+else:
+  `=sink`(this.matchDirs, [])
+`=destroy`(par)
+-- end of expandArc ------------------------
+--expandArc: check
+
+check(this)
+-- end of expandArc ------------------------
+(package: "", ext: "meo")
+doing shady stuff...
+3
+6
+(@[1], @[2])
+192.168.0.1
+192.168.0.1
+192.168.0.1
+192.168.0.1
+'''
 """
 
-import os
+import os, std/private/ntpath
 
-type Target = tuple[repo, package, ext: string]
+type Target = tuple[package, ext: string]
 
 proc newTarget*(path: string): Target =
-  let splat = path.splitFile
-  result = (repo: splat.dir, package: splat.name, ext: splat.ext)
+  let splat = path.splitDrive
+  result = (package: splat.drive, ext: splat.path)
 
 echo newTarget("meo")
 
@@ -277,3 +329,48 @@ proc extractConfig() =
     echo splitted[1] # Without this line everything works
 
 extractConfig()
+
+
+type
+  Symbol = ref object
+    name: string
+
+  Scope = ref object
+    parent: Scope
+    symbols: seq[Symbol]
+
+  PContext = ref object
+    currentScope: Scope
+
+proc rawCloseScope(c: PContext) =
+  c.currentScope = c.currentScope.parent
+
+proc addInterfaceDecl(c: PContext; s: Symbol) =
+  c.currentScope.symbols.add s
+
+proc mergeShadowScope*(c: PContext) =
+  let shadowScope = c.currentScope
+  c.rawCloseScope
+  for sym in shadowScope.symbols:
+    c.addInterfaceDecl(sym)
+
+mergeShadowScope(PContext(currentScope: Scope(parent: Scope())))
+
+type
+  Foo = ref object
+    isValid*: bool
+    value*: string
+    matchDirs*: seq[string]
+
+proc getSubDirs(parent, front: string): seq[string] = @[]
+
+method check(this: Foo) {.base.} =
+  this.isValid = fileExists(this.value)
+  let par = if dirExists(this.value): (dir: this.value, front: "")
+            else: (dir: parentDir(this.value), front: splitDrive(this.value).path)
+  if dirExists(par.dir):
+    this.matchDirs = getSubDirs(par.dir, par.front)
+  else:
+    this.matchDirs = @[]
+
+check(Foo())
diff --git a/tests/arc/topt_refcursors.nim b/tests/arc/topt_refcursors.nim
index f097150a3..8c638a4a1 100644
--- a/tests/arc/topt_refcursors.nim
+++ b/tests/arc/topt_refcursors.nim
@@ -1,26 +1,35 @@
 discard """
   output: ''''''
   cmd: '''nim c --gc:arc --expandArc:traverse --hint:Performance:off $file'''
-  nimout: '''--expandArc: traverse
+  nimout: '''
+--expandArc: traverse
 
 var
   it_cursor
-  jt_cursor
-it_cursor = root
-block :tmp:
-  while (
-    not (it_cursor == nil)):
-    echo [it_cursor.s]
-    it_cursor = it_cursor.ri
-jt_cursor = root
-block :tmp_1:
-  while (
-    not (jt_cursor == nil)):
-    var ri_1_cursor
-    ri_1_cursor = jt_cursor.ri
-    echo [jt_cursor.s]
-    jt_cursor = ri_1_cursor
--- end of expandArc ------------------------'''
+  jt
+try:
+  it_cursor = root
+  block :tmp:
+    while (
+      not (it_cursor == nil)):
+      echo [it_cursor.s]
+      it_cursor = it_cursor.ri
+  `=copy`(jt, root)
+  block :tmp_1:
+    while (
+      not (jt == nil)):
+      var ri_1
+      try:
+        `=copy`(ri_1, jt.ri)
+        echo [jt.s]
+        `=sink`(jt, ri_1)
+        `=wasMoved`(ri_1)
+      finally:
+        `=destroy`(ri_1)
+finally:
+  `=destroy`(jt)
+-- end of expandArc ------------------------
+'''
 """
 
 type
diff --git a/tests/arc/topt_wasmoved_destroy_pairs.nim b/tests/arc/topt_wasmoved_destroy_pairs.nim
index 2f971f112..c96340a30 100644
--- a/tests/arc/topt_wasmoved_destroy_pairs.nim
+++ b/tests/arc/topt_wasmoved_destroy_pairs.nim
@@ -1,7 +1,8 @@
 discard """
   output: ''''''
   cmd: '''nim c --gc:arc --expandArc:main --expandArc:tfor --hint:Performance:off $file'''
-  nimout: '''--expandArc: main
+  nimout: '''
+--expandArc: main
 
 var
   a
@@ -29,6 +30,7 @@ try:
   x = f()
   block :tmp:
     var i_cursor
+    mixin inc
     var i_1 = 0
     block :tmp_1:
       while i_1 < 4:
@@ -37,25 +39,25 @@ try:
         if i_cursor == 2:
           return
         add(a):
-          wasMoved(:tmpD)
-          `=copy`(:tmpD, x)
+          :tmpD = `=dup`(x)
           :tmpD
         inc i_1, 1
   if cond:
     add(a):
       let blitTmp = x
-      wasMoved(x)
+      `=wasMoved`(x)
       blitTmp
   else:
     add(b):
       let blitTmp_1 = x
-      wasMoved(x)
+      `=wasMoved`(x)
       blitTmp_1
 finally:
   `=destroy`(x)
   `=destroy_1`(b)
   `=destroy_1`(a)
--- end of expandArc ------------------------'''
+-- end of expandArc ------------------------
+'''
 """
 
 proc f(): seq[int] =
diff --git a/tests/arc/torcmisc.nim b/tests/arc/torcmisc.nim
index 20dd18fb3..e41ad7c77 100644
--- a/tests/arc/torcmisc.nim
+++ b/tests/arc/torcmisc.nim
@@ -32,3 +32,35 @@ when true:
   waitFor hello(Flags())
   echo "success"
 
+# bug #18240
+import tables
+
+type
+  TopicHandler* = proc(topic: string,
+                       data: seq[byte]): Future[void] {.gcsafe, raises: [Defect].}
+
+  PeerID* = object
+    data*: seq[byte]
+
+  PeerInfo* = ref object of RootObj
+    peerId*: PeerID
+
+  Connection* = ref object of RootObj
+    peerInfo*: PeerInfo
+
+  PubSubPeer* = ref object of RootObj
+    codec*: string
+
+  PubSub* = ref object of RootObj
+    topics*: Table[string, seq[TopicHandler]]
+    peers*: Table[PeerID, PubSubPeer]
+
+proc getOrCreatePeer*(myParam: PubSub, peerId: PeerID, protos: seq[string]): PubSubPeer =
+  myParam.peers.withValue(peerId, peer):
+    return peer[]
+
+method handleConn*(myParam: PubSub,
+                  conn: Connection,
+                  proto: string) {.base, async.} =
+  myParam.peers.withValue(conn.peerInfo.peerId, peer):
+    let peerB = peer[]
diff --git a/tests/arc/tref_cast_error.nim b/tests/arc/tref_cast_error.nim
index b0d2faf77..20139c1be 100644
--- a/tests/arc/tref_cast_error.nim
+++ b/tests/arc/tref_cast_error.nim
@@ -1,6 +1,6 @@
 discard """
   cmd: "nim c --gc:arc $file"
-  errormsg: "expression cannot be cast to ref RootObj"
+  errormsg: "expression cannot be cast to 'ref RootObj'"
   joinable: false
 """
 
diff --git a/tests/arc/trepr.nim b/tests/arc/trepr.nim
index 50d433208..abf28330a 100644
--- a/tests/arc/trepr.nim
+++ b/tests/arc/trepr.nim
@@ -9,6 +9,7 @@ nil
 2
 Obj(member: ref @["hello"])
 ref (member: ref @["hello"])
+ObjUa(v: 0, a: [...])
 '''
 """
 
@@ -87,3 +88,10 @@ macro extract(): untyped =
   test(parseExpr("discard"))
   
 extract()
+
+type
+  ObjUa = ref object
+    v: int
+    a: UncheckedArray[char]
+
+echo ObjUa().repr
diff --git a/tests/arc/tshared_ptr_crash.nim b/tests/arc/tshared_ptr_crash.nim
new file mode 100644
index 000000000..1794834db
--- /dev/null
+++ b/tests/arc/tshared_ptr_crash.nim
@@ -0,0 +1,67 @@
+discard """
+  cmd: "nim c --threads:on --gc:arc $file"
+  action: compile
+"""
+
+# bug #17893
+
+type
+  SharedPtr*[T] = object
+    val: ptr tuple[value: T, atomicCounter: int]
+
+proc `=destroy`*[T](p: var SharedPtr[T]) =
+  mixin `=destroy`
+  if p.val != nil:
+    if atomicLoadN(addr p.val[].atomicCounter, AtomicConsume) == 0:
+      `=destroy`(p.val[])
+      deallocShared(p.val)
+    else:
+      discard atomicDec(p.val[].atomicCounter)
+
+proc `=copy`*[T](dest: var SharedPtr[T], src: SharedPtr[T]) =
+  if src.val != nil:
+    discard atomicInc(src.val[].atomicCounter)
+  if dest.val != nil:
+    `=destroy`(dest)
+  dest.val = src.val
+
+proc newSharedPtr*[T](val: sink T): SharedPtr[T] {.nodestroy.} =
+  result.val = cast[typeof(result.val)](allocShared(sizeof(result.val[])))
+  result.val.atomicCounter = 0
+  result.val.value = val
+
+proc isNil*[T](p: SharedPtr[T]): bool {.inline.} =
+  p.val == nil
+
+proc `[]`*[T](p: SharedPtr[T]): var T {.inline.} =
+  when compileOption("boundChecks"):
+    doAssert(p.val != nil, "deferencing nil shared pointer")
+  result = p.val.value
+
+type
+  Sender*[T] = object
+    queue: SharedPtr[seq[T]]
+
+proc newSender*[T](queue: sink SharedPtr[seq[T]]): Sender[T] =
+  result = Sender[T](queue: queue)
+
+proc send*[T](self: Sender[T]; t: sink T) =
+  self.queue[].add t
+
+proc newChannel*(): Sender[int] =
+  let queue = newSharedPtr(newSeq[int]())
+  result = newSender(queue)
+
+
+var
+  p: Thread[Sender[int]]
+
+proc threadFn(tx: Sender[int]) =
+  send tx, 0
+
+proc multiThreadedChannel =
+  let tx = newChannel()
+  createThread(p, threadFn, tx)
+  joinThread(p)
+
+multiThreadedChannel()
diff --git a/tests/arc/tstringliteral.nim b/tests/arc/tstringliteral.nim
new file mode 100644
index 000000000..c5fac22d8
--- /dev/null
+++ b/tests/arc/tstringliteral.nim
@@ -0,0 +1,17 @@
+discard """
+  matrix: "--mm:arc; --mm:orc"
+"""
+
+block: # issue #24080
+  var a = (s: "a")
+  var b = "a"
+  a.s.setLen 0
+  b = a.s
+  doAssert b == ""
+
+block: # issue #24080, longer string
+  var a = (s: "abc")
+  var b = "abc"
+  a.s.setLen 2
+  b = a.s
+  doAssert b == "ab"
diff --git a/tests/arc/tunref_cycle.nim b/tests/arc/tunref_cycle.nim
new file mode 100644
index 000000000..82551b7f7
--- /dev/null
+++ b/tests/arc/tunref_cycle.nim
@@ -0,0 +1,26 @@
+discard """
+  outputsub: '''inside closure
+hello world'''
+  cmd: "nim c --gc:orc -d:useMalloc $file"
+  valgrind: true
+"""
+
+# bug #18579
+
+var fp: proc (env: pointer) {.cdecl.}
+var env: pointer
+
+proc store(f: proc (){.closure.}) =
+  proc closeOver() =
+    echo "inside closure"
+    f()
+  (fp,env) = (cast[proc(env: pointer){.cdecl.}](rawProc closeOver), rawEnv closeOver)
+  GC_ref(cast[RootRef](env))
+
+proc run() =
+  fp(env)
+  GC_unref(cast[RootRef](env))
+
+store(proc() = echo "hello world")
+run()
+GC_fullCollect()
diff --git a/tests/arc/tweave.nim b/tests/arc/tweave.nim
index 220d65f97..1c60ac403 100644
--- a/tests/arc/tweave.nim
+++ b/tests/arc/tweave.nim
@@ -8,6 +8,9 @@ discard """
 
 import std/atomics
 
+when defined(nimPreviewSlimSystem):
+  import std/[assertions, typedthreads]
+
 const MemBlockSize = 256
 
 type
diff --git a/tests/arc/twrong_sinkinference.nim b/tests/arc/twrong_sinkinference.nim
index 59930a9fa..ecf09d28a 100644
--- a/tests/arc/twrong_sinkinference.nim
+++ b/tests/arc/twrong_sinkinference.nim
@@ -1,6 +1,6 @@
 discard """
   cmd: "nim c --gc:arc $file"
-  errormsg: "type mismatch: got <proc (a: string, b: sink string){.noSideEffect, gcsafe, locks: 0.}>"
+  errormsg: "type mismatch: got <proc (a: string, b: sink string){.noSideEffect, gcsafe.}>"
   line: 18
 """