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-rw-r--r--tests/async/tasync_misc.nim3
-rw-r--r--tests/async/tasyncssl.nim4
-rw-r--r--tests/casestmt/tcasestm.nim18
-rw-r--r--tests/cpp/tasync_cpp.nim1
-rw-r--r--tests/distinct/tnil.nim15
-rw-r--r--tests/exception/tdont_overwrite_typename.nim4
-rw-r--r--tests/exprs/tstmtexprs.nim2
-rw-r--r--tests/generics/tgeneric3.nim4
-rw-r--r--tests/generics/tobjecttyperel.nim12
-rw-r--r--tests/js/tclosures.nim2
-rw-r--r--tests/js/testobjs.nim2
-rw-r--r--tests/js/tjsffi.nim2
-rw-r--r--tests/macros/tforloop_macro1.nim2
-rw-r--r--tests/manyloc/argument_parser/argument_parser.nim10
-rw-r--r--tests/manyloc/keineschweine/lib/sg_assets.nim4
-rw-r--r--tests/manyloc/keineschweine/lib/sg_gui.nim4
-rw-r--r--tests/notnil/tmust_compile.nim20
-rw-r--r--tests/notnil/tnotnil.nim12
-rw-r--r--tests/notnil/tnotnil1.nim15
-rw-r--r--tests/notnil/tnotnil_in_objconstr.nim8
-rw-r--r--tests/parallel/tptr_to_ref.nim4
-rw-r--r--tests/parallel/twaitany.nim4
-rw-r--r--tests/pragmas/custom_pragma.nim2
-rw-r--r--tests/stdlib/nre/captures.nim6
-rw-r--r--tests/stdlib/nre/replace.nim4
-rw-r--r--tests/stdlib/tjsonmacro.nim4
-rw-r--r--tests/stdlib/tnilecho.nim8
-rw-r--r--tests/system/tnilconcats.nim2
-rw-r--r--tests/system/tostring.nim10
-rw-r--r--tests/template/mgensym_generic_cross_module.nim4
-rw-r--r--tests/template/tdefault_nil.nim2
-rw-r--r--tests/testament/categories.nim6
-rw-r--r--tests/testament/specs.nim4
-rw-r--r--tests/threads/tactors.nim4
-rw-r--r--tests/tuples/tuple_with_nil.nim24
-rw-r--r--tests/tuples/tuple_with_seq.nim4
-rw-r--r--tests/types/temptyseqs.nim2
-rw-r--r--tests/vm/meta.nim22
-rw-r--r--tests/vm/tcomponent.nim2
-rw-r--r--tests/vm/tseq_badinit.nim4
-rw-r--r--tests/vm/tstringnil.nim8
41 files changed, 113 insertions, 161 deletions
diff --git a/tests/async/tasync_misc.nim b/tests/async/tasync_misc.nim
index 695dcd98a..dbc2ea434 100644
--- a/tests/async/tasync_misc.nim
+++ b/tests/async/tasync_misc.nim
@@ -37,8 +37,7 @@ block: #8399
       case line[0]
       of '+', '-': @[]
       of '$': (let x = await bar(); @[""])
-      else:
-        nil
+      else: @[]
 
     doAssert(res == @[""])
 
diff --git a/tests/async/tasyncssl.nim b/tests/async/tasyncssl.nim
index 3dc131036..0607cf3c6 100644
--- a/tests/async/tasyncssl.nim
+++ b/tests/async/tasyncssl.nim
@@ -15,11 +15,11 @@ when defined(ssl):
   var clientCount = 0
 
   proc sendMessages(client: AsyncSocket) {.async.} =
-    for i in 0 .. <messagesToSend:
+    for i in 0 ..< messagesToSend:
       await send(client, "Message " & $i & "\c\L")
 
   proc launchSwarm(port: Port) {.async.} =
-    for i in 0 .. <swarmSize:
+    for i in 0 ..< swarmSize:
       var sock = newAsyncSocket()
       var clientContext = newContext(verifyMode = CVerifyNone)
       clientContext.wrapSocket(sock)
diff --git a/tests/casestmt/tcasestm.nim b/tests/casestmt/tcasestm.nim
index 4d32d023f..ff912ffab 100644
--- a/tests/casestmt/tcasestm.nim
+++ b/tests/casestmt/tcasestm.nim
@@ -41,16 +41,16 @@ let str2 = "NN"
 let a = case str1:
   of "Y": true
   of "N": false
-  else: 
+  else:
     echo "no good"
     quit("quiting")
 
-proc toBool(s: string): bool = 
+proc toBool(s: string): bool =
   case s:
-    of nil, "": raise newException(ValueError, "Invalid boolean")
-    elif s[0] == 'Y': true
-    elif s[0] == 'N': false
-    else: "error".quit(2)
+  of "": raise newException(ValueError, "Invalid boolean")
+  elif s[0] == 'Y': true
+  elif s[0] == 'N': false
+  else: "error".quit(2)
 
 
 let b = "NN".toBool()
@@ -66,7 +66,7 @@ static:
 var bb: bool
 doassert(not compiles(
   bb = case str2:
-    of nil, "": raise newException(ValueError, "Invalid boolean")
+    of "": raise newException(ValueError, "Invalid boolean")
     elif str.startsWith("Y"): true
     elif str.startsWith("N"): false
 ))
@@ -94,7 +94,7 @@ doassert(not compiles(
   bb = case str2:
     of "Y":
       raise newException(ValueError, "Invalid Y")
-      true    
+      true
     else: raise newException(ValueError, "Invalid")
 ))
 
@@ -103,6 +103,6 @@ doassert(not compiles(
   bb = case str2:
     of "Y":
       "invalid Y".quit(3)
-      true    
+      true
     else: raise newException(ValueError, "Invalid")
 ))
\ No newline at end of file
diff --git a/tests/cpp/tasync_cpp.nim b/tests/cpp/tasync_cpp.nim
index a5e3374b6..50bc1853c 100644
--- a/tests/cpp/tasync_cpp.nim
+++ b/tests/cpp/tasync_cpp.nim
@@ -1,6 +1,7 @@
 discard """
   targets: "cpp"
   output: "hello"
+  cmd: "nim cpp --nilseqs:on $file"
 """
 
 # bug #3299
diff --git a/tests/distinct/tnil.nim b/tests/distinct/tnil.nim
index 759a14657..16de38f60 100644
--- a/tests/distinct/tnil.nim
+++ b/tests/distinct/tnil.nim
@@ -9,7 +9,6 @@ discard """
 type
   MyPointer = distinct pointer
   MyString = distinct string
-  MyStringNotNil = distinct (string not nil)
   MyInt = distinct int
 
 proc foo(a: MyPointer) =
@@ -26,20 +25,6 @@ p = cast[MyPointer](nil)
 p = nil.MyPointer
 p = nil
 
-var c: MyString
-c = "Test".MyString
-c = nil.MyString
-c = nil
-
-p = nil
-doAssert(compiles(c = p) == false)
-
-var n: MyStringNotNil = "Test".MyStringNotNil # Cannot prove warning ...
-n = "Test".MyStringNotNil
-doAssert(compiles(n = nil.MyStringNotNil) == false)
-doAssert(compiles(n = nil.MyStringNotNil) == false)
-doAssert(compiles(n = nil) == false)
-
 var i: MyInt
 i = 1.MyInt
 doAssert(compiles(i = nil) == false)
diff --git a/tests/exception/tdont_overwrite_typename.nim b/tests/exception/tdont_overwrite_typename.nim
index 6e3ff816f..d6dca0990 100644
--- a/tests/exception/tdont_overwrite_typename.nim
+++ b/tests/exception/tdont_overwrite_typename.nim
@@ -7,10 +7,10 @@ Check passed'''
 # bug #5628
 
 proc checkException(ex: ref Exception) =
-  doAssert(ex.name == "ValueError")
+  doAssert(ex.name == cstring"ValueError")
   doAssert(ex.msg == "SecondException")
   doAssert(ex.parent != nil)
-  doAssert(ex.parent.name == "KeyError")
+  doAssert(ex.parent.name == cstring"KeyError")
   doAssert(ex.parent.msg == "FirstException")
   echo "Check passed"
 
diff --git a/tests/exprs/tstmtexprs.nim b/tests/exprs/tstmtexprs.nim
index 61089b694..615c36024 100644
--- a/tests/exprs/tstmtexprs.nim
+++ b/tests/exprs/tstmtexprs.nim
@@ -87,7 +87,7 @@ proc parseResponse(): JsonNode =
     var excMsg = key & "("
     if (var n=result["key2"]; n != nil):
       excMsg &= n.str
-    raise newException(SystemError, excMsg)
+    raise newException(CatchableError, excMsg)
 
 
 
diff --git a/tests/generics/tgeneric3.nim b/tests/generics/tgeneric3.nim
index d014eb998..6897d9de2 100644
--- a/tests/generics/tgeneric3.nim
+++ b/tests/generics/tgeneric3.nim
@@ -103,7 +103,7 @@ proc DeleteItem[T,D] (n: PNode[T,D], x: int): PNode[T,D] {.inline.} =
 
   else :
     result = n.left
-    n.slots = nil
+    n.slots = @[]
     n.left = nil
 
 proc internalDelete[T,D] (ANode: PNode[T,D], key: T, Avalue: var D): PNode[T,D] =
@@ -200,7 +200,7 @@ proc traceTree[T,D](root: PNode[T,D]) =
       traceln(space)
       write stdout, "left: "
       doTrace(n.left, level+1)
-    for i, el in n.slots :
+    for i, el in n.slots:
       if el != nil and not isClean(el):
         traceln(space)
         traceX(i)
diff --git a/tests/generics/tobjecttyperel.nim b/tests/generics/tobjecttyperel.nim
index 8c8f90098..6c2184cc2 100644
--- a/tests/generics/tobjecttyperel.nim
+++ b/tests/generics/tobjecttyperel.nim
@@ -2,8 +2,8 @@ discard """
   output: '''(peel: 0, color: 15)
 (color: 15)
 17
-(width: 0.0, taste: nil, color: 13)
-(width: 0.0, taste: nil, color: 15)
+(width: 0.0, taste: "", color: 13)
+(width: 0.0, taste: "", color: 15)
 cool'''
 """
 
@@ -11,16 +11,16 @@ cool'''
 type
   BaseFruit[T] = object of RootObj
     color: T
-    
+
   MidLevel[T] = object of BaseFruit[T]
-  
+
   Mango = object of MidLevel[int]
     peel: int
-    
+
   Peach[X, T, Y] = object of T
     width: X
     taste: Y
-    
+
 proc setColor[T](self: var BaseFruit[T]) =
   self.color = 15
 
diff --git a/tests/js/tclosures.nim b/tests/js/tclosures.nim
index 67243c937..659c60092 100644
--- a/tests/js/tclosures.nim
+++ b/tests/js/tclosures.nim
@@ -48,4 +48,4 @@ for i in 1 .. 10:
 
 let results = runCallbacks()
 
-doAssert(expected == results)
+doAssert(expected == $results)
diff --git a/tests/js/testobjs.nim b/tests/js/testobjs.nim
index dd66825ec..78f0b4766 100644
--- a/tests/js/testobjs.nim
+++ b/tests/js/testobjs.nim
@@ -34,7 +34,7 @@ var
   recurse1 = Recurse[int](data: 1, next: recurse2)
 
 
-doAssert test.name == "Jorden"
+doAssert test.name == cstring"Jorden"
 doAssert knight.age == 19
 doAssert knight.item.price == 50
 doAssert recurse1.next.next.data == 3
diff --git a/tests/js/tjsffi.nim b/tests/js/tjsffi.nim
index 325ab6366..156ca89e3 100644
--- a/tests/js/tjsffi.nim
+++ b/tests/js/tjsffi.nim
@@ -64,7 +64,7 @@ block:
   proc test(): bool =
     let obj = newJsObject()
     obj.`?!$` = proc(x, y, z: int, t: cstring): cstring = t & $(x + y + z)
-    obj.`?!$`(1, 2, 3, "Result is: ").to(cstring) == "Result is: 6"
+    obj.`?!$`(1, 2, 3, "Result is: ").to(cstring) == cstring"Result is: 6"
   echo test()
 
 # Test JsObject []()
diff --git a/tests/macros/tforloop_macro1.nim b/tests/macros/tforloop_macro1.nim
index a8f45c7ac..49918563d 100644
--- a/tests/macros/tforloop_macro1.nim
+++ b/tests/macros/tforloop_macro1.nim
@@ -12,7 +12,7 @@ discard """
 """
 
 import macros
-
+{.experimental: "forLoopMacros".}
 macro mymacro(): untyped =
   result = newLit([1, 2, 3])
 
diff --git a/tests/manyloc/argument_parser/argument_parser.nim b/tests/manyloc/argument_parser/argument_parser.nim
index 1095a893e..985139f0a 100644
--- a/tests/manyloc/argument_parser/argument_parser.nim
+++ b/tests/manyloc/argument_parser/argument_parser.nim
@@ -74,14 +74,14 @@ type
     ## nothing prevents you from accessing directly the type of field you want
     ## if you expect only one kind.
     case kind*: Tparam_kind
-    of PK_EMPTY: nil
+    of PK_EMPTY: discard
     of PK_INT: int_val*: int
     of PK_BIGGEST_INT: big_int_val*: BiggestInt
     of PK_FLOAT: float_val*: float
     of PK_BIGGEST_FLOAT: big_float_val*: BiggestFloat
     of PK_STRING: str_val*: string
     of PK_BOOL: bool_val*: bool
-    of PK_HELP: nil
+    of PK_HELP: discard
 
   Tcommandline_results* = object of RootObj ## \
     ## Contains the results of the parsing.
@@ -319,7 +319,7 @@ proc echo_help*(expected: seq[Tparameter_specification] = @[],
 
 
 proc parse*(expected: seq[Tparameter_specification] = @[],
-    type_of_positional_parameters = PK_STRING, args: seq[TaintedString] = nil,
+    type_of_positional_parameters = PK_STRING, args: seq[TaintedString] = @[],
     bad_prefixes = @["-", "--"], end_of_options = "--",
     quit_on_failure = true): Tcommandline_results =
   ## Parses parameters and returns results.
@@ -339,7 +339,7 @@ proc parse*(expected: seq[Tparameter_specification] = @[],
   ##
   ## The args sequence should be the list of parameters passed to your program
   ## without the program binary (usually OSes provide the path to the binary as
-  ## the zeroth parameter). If args is nil, the list will be retrieved from the
+  ## the zeroth parameter). If args is empty, the list will be retrieved from the
   ## OS.
   ##
   ## If there is any kind of error and quit_on_failure is true, the quit proc
@@ -358,7 +358,7 @@ proc parse*(expected: seq[Tparameter_specification] = @[],
 
   # Prepare the input parameter list, maybe get it from the OS if not available.
   var args = args
-  if args == nil:
+  if args.len == 0:
     let total_params = paramCount()
     #echo "Got no explicit args, retrieving from OS. Count: ", total_params
     newSeq(args, total_params)
diff --git a/tests/manyloc/keineschweine/lib/sg_assets.nim b/tests/manyloc/keineschweine/lib/sg_assets.nim
index 1e8a99c83..90f0a54e9 100644
--- a/tests/manyloc/keineschweine/lib/sg_assets.nim
+++ b/tests/manyloc/keineschweine/lib/sg_assets.nim
@@ -145,7 +145,7 @@ proc importHandling(data: JsonNode): THandlingRecord
 proc importBullet(data: JsonNode; errors: var seq[string]): PBulletRecord
 proc importSoul(data: JsonNode): TSoulRecord
 proc importExplosion(data: JsonNode; errors: var seq[string]): TExplosionRecord
-proc importSound*(data: JsonNode; errors: var seq[string]; fieldName: string = nil): PSoundRecord
+proc importSound*(data: JsonNode; errors: var seq[string]; fieldName: string = ""): PSoundRecord
 
 ## this is the only pipe between lobby and main.nim
 proc getActiveState*(): TGameState =
@@ -514,7 +514,7 @@ proc importExplosion(data: JsonNode; errors: var seq[string]): TExplosionRecord
   let expl = data["explode"]
   result.anim = importAnim(expl, errors)
   result.sound = importSound(expl, errors, "sound")
-proc importSound*(data: JsonNode; errors: var seq[string]; fieldName: string = nil): PSoundRecord =
+proc importSound*(data: JsonNode; errors: var seq[string]; fieldName: string = ""): PSoundRecord =
   if data.kind == JObject:
     checkKey(data, fieldName)
     result = newSound(data[fieldName].str, errors)
diff --git a/tests/manyloc/keineschweine/lib/sg_gui.nim b/tests/manyloc/keineschweine/lib/sg_gui.nim
index 95cef1b24..074e0604c 100644
--- a/tests/manyloc/keineschweine/lib/sg_gui.nim
+++ b/tests/manyloc/keineschweine/lib/sg_gui.nim
@@ -92,8 +92,8 @@ proc newGuiContainer*(pos: TVector2f): PGuiContainer =
   result = newGuiContainer()
   result.setPosition pos
 proc free*(container: PGuiContainer) =
-  container.widgets = nil
-  container.buttons = nil
+  container.widgets = @[]
+  container.buttons = @[]
 proc add*(container: PGuiContainer; widget: PGuiObject) =
   container.widgets.add(widget)
 proc add*(container: PGuiContainer; button: PButton) =
diff --git a/tests/notnil/tmust_compile.nim b/tests/notnil/tmust_compile.nim
index a32c6c7ec..d09dda057 100644
--- a/tests/notnil/tmust_compile.nim
+++ b/tests/notnil/tmust_compile.nim
@@ -44,16 +44,16 @@ import json
 type
 
   foo = object
-    thing: string not nil
+    thing: ptr int not nil
 
   CTS = ref object
     subs_by_sid: Table[int, foo]
 
 
 proc parse(cts: CTS, jn: JsonNode) =
-
+  var y = jn.getInt(4523)
   let ces = foo(
-    thing: jn.getStr("thing")
+    thing: addr y
   )
 
   cts.subs_by_sid[0] = ces
@@ -63,17 +63,3 @@ proc parse(cts: CTS, jn: JsonNode) =
 
 proc p(x: proc(){.closure.} not nil) = discard
 p(proc(){.closure.} = discard)
-
-# bug #3993
-
-type
-  List[T] = seq[T] not nil
-
-proc `^^`[T](v: T, lst: List[T]): List[T] =
-  result = @[v]
-  result.add(lst)
-
-proc Nil[T](): List[T] = @[]
-
-when isMainModule:
-  let lst = 1 ^^ 2 ^^ Nil[int]()
diff --git a/tests/notnil/tnotnil.nim b/tests/notnil/tnotnil.nim
index e392b155c..aff3f8959 100644
--- a/tests/notnil/tnotnil.nim
+++ b/tests/notnil/tnotnil.nim
@@ -1,5 +1,5 @@
 discard """
-  line: 22
+  line: 13
   errormsg: "type mismatch"
 """
 {.experimental: "notnil".}
@@ -8,16 +8,6 @@ type
   TObj = object
     x: int
 
-  MyString = string not nil
-
-#var x: PObj = nil
-
-proc p(x: string not nil): int =
-  result = 45
-
-proc q(x: MyString) = discard
 proc q2(x: string) = discard
 
 q2(nil)
-q(nil)
-
diff --git a/tests/notnil/tnotnil1.nim b/tests/notnil/tnotnil1.nim
index 7f9d02295..60666d64d 100644
--- a/tests/notnil/tnotnil1.nim
+++ b/tests/notnil/tnotnil1.nim
@@ -1,6 +1,6 @@
 discard """
   errormsg: "'y' is provably nil"
-  line:38
+  line:25
 """
 
 import strutils
@@ -10,19 +10,6 @@ type
   TObj = object
     x, y: int
 
-type
-  superstring = string not nil
-
-
-proc q(s: superstring) =
-  echo s
-
-proc p2() =
-  var a: string = "I am not nil"
-  q(a) # but this should and does not
-
-p2()
-
 proc q(x: pointer not nil) =
   discard
 
diff --git a/tests/notnil/tnotnil_in_objconstr.nim b/tests/notnil/tnotnil_in_objconstr.nim
index d33709906..f0d5c1ae2 100644
--- a/tests/notnil/tnotnil_in_objconstr.nim
+++ b/tests/notnil/tnotnil_in_objconstr.nim
@@ -6,9 +6,9 @@ discard """
 # bug #2355
 type
   Foo = object
-    foo: string not nil
-    bar: string not nil
-
+    foo: ref int
+    bar: ref int not nil
+var x: ref int = new(int)
 # Create instance without initializaing the `bar` field
-var f = Foo(foo: "foo")
+var f = Foo(foo: x)
 echo f.bar.isNil # true
diff --git a/tests/parallel/tptr_to_ref.nim b/tests/parallel/tptr_to_ref.nim
index fee210dcd..ae02c16e5 100644
--- a/tests/parallel/tptr_to_ref.nim
+++ b/tests/parallel/tptr_to_ref.nim
@@ -11,7 +11,7 @@ type
   Killer* = object
     lock:                      Lock
     bailed    {.guard: lock.}: bool
-    processes {.guard: lock.}: array[0..MAX_WORKERS-1, foreign ptr Process]
+    processes {.guard: lock.}: array[0..MAX_WORKERS-1, ptr Process]
 
 # Hold a lock for a statement.
 template hold(lock: Lock, body: untyped) =
@@ -32,7 +32,7 @@ proc initKiller*(): Killer =
 var killer = initKiller()
 
 # remember that a process has been launched, killing it if we have bailed.
-proc launched*(process: foreign ptr Process): int {.gcsafe.} =
+proc launched*(process: ptr Process): int {.gcsafe.} =
   result = killer.processes.high + 1
   killer.lock.hold:
     if killer.bailed:
diff --git a/tests/parallel/twaitany.nim b/tests/parallel/twaitany.nim
index 69136a3b6..fcabf691e 100644
--- a/tests/parallel/twaitany.nim
+++ b/tests/parallel/twaitany.nim
@@ -18,12 +18,12 @@ var results: seq[int] = @[]
 for i in 0 .. durations.high:
   tasks.add spawn timer(durations[i])
 
-var index = awaitAny(tasks)
+var index = blockUntilAny(tasks)
 while index != -1:
   results.add ^cast[FlowVar[int]](tasks[index])
   tasks.del(index)
   #echo repr results
-  index = awaitAny(tasks)
+  index = blockUntilAny(tasks)
 
 doAssert results.len == 5
 doAssert 1000 in results
diff --git a/tests/pragmas/custom_pragma.nim b/tests/pragmas/custom_pragma.nim
index 9e8f51deb..d2fc969d0 100644
--- a/tests/pragmas/custom_pragma.nim
+++ b/tests/pragmas/custom_pragma.nim
@@ -2,4 +2,4 @@
 
 template serializationKey*(s: string) {.pragma.}
 template defaultValue*(V: typed) {.pragma.}
-template alternativeKey*(s: string = nil, V: typed) {.pragma.}
\ No newline at end of file
+template alternativeKey*(s: string = "", V: typed) {.pragma.}
diff --git a/tests/stdlib/nre/captures.nim b/tests/stdlib/nre/captures.nim
index 19c344a8d..31de71154 100644
--- a/tests/stdlib/nre/captures.nim
+++ b/tests/stdlib/nre/captures.nim
@@ -27,7 +27,7 @@ suite "captures":
 
     let ex2 = "foo".find(re("(?<foo>foo)(?<bar>bar)?"))
     check(ex2.captures["foo"] == "foo")
-    check(ex2.captures["bar"] == nil)
+    check(ex2.captures["bar"] == "")
 
   test "named capture bounds":
     let ex1 = "foo".find(re("(?<foo>foo)(?<bar>bar)?"))
@@ -41,7 +41,7 @@ suite "captures":
 
   test "named capture table":
     let ex1 = "foo".find(re("(?<foo>foo)(?<bar>bar)?"))
-    check(ex1.captures.toTable == {"foo" : "foo", "bar" : nil}.toTable())
+    check(ex1.captures.toTable == {"foo" : "foo", "bar" : ""}.toTable())
     check(ex1.captureBounds.toTable == {"foo" : some(0..2), "bar" : none(Slice[int])}.toTable())
     check(ex1.captures.toTable("") == {"foo" : "foo", "bar" : ""}.toTable())
 
@@ -50,7 +50,7 @@ suite "captures":
 
   test "capture sequence":
     let ex1 = "foo".find(re("(?<foo>foo)(?<bar>bar)?"))
-    check(ex1.captures.toSeq == @["foo", nil])
+    check(ex1.captures.toSeq == @["foo", ""])
     check(ex1.captureBounds.toSeq == @[some(0..2), none(Slice[int])])
     check(ex1.captures.toSeq("") == @["foo", ""])
 
diff --git a/tests/stdlib/nre/replace.nim b/tests/stdlib/nre/replace.nim
index 516fd4328..b762271a2 100644
--- a/tests/stdlib/nre/replace.nim
+++ b/tests/stdlib/nre/replace.nim
@@ -16,5 +16,5 @@ suite "replace":
     check("123".replace(re"(?<foo>\d)(\d)", "${foo}$#$#") == "1123")
 
   test "replacing missing captures should throw instead of segfaulting":
-    expect ValueError: discard "ab".replace(re"(a)|(b)", "$1$2")
-    expect ValueError: discard "b".replace(re"(a)?(b)", "$1$2")
+    discard "ab".replace(re"(a)|(b)", "$1$2")
+    discard "b".replace(re"(a)?(b)", "$1$2")
diff --git a/tests/stdlib/tjsonmacro.nim b/tests/stdlib/tjsonmacro.nim
index c0b4d5f78..bf0bb3ea7 100644
--- a/tests/stdlib/tjsonmacro.nim
+++ b/tests/stdlib/tjsonmacro.nim
@@ -40,7 +40,7 @@ when isMainModule:
     test: 18827361,
     test2: "hello world",
     test3: true,
-    testNil: nil
+    testNil: "nil"
   )
 
   let node = %x
@@ -53,7 +53,7 @@ when isMainModule:
   doAssert y.test == 18827361
   doAssert y.test2 == "hello world"
   doAssert y.test3
-  doAssert y.testNil.isNil
+  doAssert y.testNil == "nil"
 
   # Test for custom object variants (without an enum) and with an else branch.
   block:
diff --git a/tests/stdlib/tnilecho.nim b/tests/stdlib/tnilecho.nim
index 147b5e492..ec8d71dab 100644
--- a/tests/stdlib/tnilecho.nim
+++ b/tests/stdlib/tnilecho.nim
@@ -1,2 +1,6 @@
-var x = @["1", nil, "3"]
-doAssert $x == "@[1, nil, 3]"
+discard """
+  output: ""
+"""
+
+var x = @["1", "", "3"]
+doAssert $x == """@["1", "", "3"]"""
diff --git a/tests/system/tnilconcats.nim b/tests/system/tnilconcats.nim
index ce059b7b0..5e4a1b317 100644
--- a/tests/system/tnilconcats.nim
+++ b/tests/system/tnilconcats.nim
@@ -1,5 +1,5 @@
 discard """
-  output: '''@[nil, nil, nil, nil, nil, nil, nil, "meh"]'''
+  output: '''@["", "", "", "", "", "", "", "meh"]'''
   exitcode: "0"
 """
 
diff --git a/tests/system/tostring.nim b/tests/system/tostring.nim
index 9a6b83f95..99299f203 100644
--- a/tests/system/tostring.nim
+++ b/tests/system/tostring.nim
@@ -26,8 +26,8 @@ doAssert "nan" == $(0.0/0.0)
 var x: seq[string]
 doAssert "nil" == $(x)
 
-var y: string = nil
-doAssert nil == $(y)
+var y: string
+doAssert "" == $(y)
 
 type
   Foo = object
@@ -54,7 +54,7 @@ doAssert $arr == "['H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd', '!', '
 doAssert $cstring(unsafeAddr arr) == "Hello World!"
 
 proc takes(c: cstring) =
-  doAssert c == ""
+  doAssert c == cstring""
 
 proc testm() =
   var x: string
@@ -90,12 +90,8 @@ proc stringCompare() =
 
   doAssert e == ""
   doAssert "" == e
-  doAssert nil == e
-  doAssert e == nil
   doAssert f == g
   doAssert "" == ""
-  doAssert "" == nil
-  doAssert nil == ""
 
   g.setLen(10)
   doAssert g == "\0\0\0\0\0\0\0\0\0\0"
diff --git a/tests/template/mgensym_generic_cross_module.nim b/tests/template/mgensym_generic_cross_module.nim
index 80b681db4..ea88f67e6 100644
--- a/tests/template/mgensym_generic_cross_module.nim
+++ b/tests/template/mgensym_generic_cross_module.nim
@@ -1,6 +1,6 @@
 
-template makeDomElement(x: untyped, name: string = nil) =
-  const tag {.gensym.} = if name == nil: astToStr(x) else: name
+template makeDomElement(x: untyped, name: string = "") =
+  const tag {.gensym.} = if name.len == 0: astToStr(x) else: name
 
   proc x*(p: int|float) =
     echo tag, p
diff --git a/tests/template/tdefault_nil.nim b/tests/template/tdefault_nil.nim
index c5c372d9e..311a6c090 100644
--- a/tests/template/tdefault_nil.nim
+++ b/tests/template/tdefault_nil.nim
@@ -2,7 +2,7 @@
 # bug #2629
 import sequtils, os
 
-template glob_rst(basedir: string = nil): untyped =
+template glob_rst(basedir: string = ""): untyped =
   if baseDir.isNil:
     to_seq(walk_files("*.rst"))
   else:
diff --git a/tests/testament/categories.nim b/tests/testament/categories.nim
index fca6927d4..2c55bd0bd 100644
--- a/tests/testament/categories.nim
+++ b/tests/testament/categories.nim
@@ -260,6 +260,8 @@ proc jsTests(r: var TResults, cat: Category, options: string) =
 # ------------------------- nim in action -----------
 
 proc testNimInAction(r: var TResults, cat: Category, options: string) =
+  let options = options & " --nilseqs:on"
+
   template test(filename: untyped, action: untyped) =
     testSpec r, makeTest(filename, options, cat, action)
 
@@ -488,7 +490,9 @@ proc processCategory(r: var TResults, cat: Category, options: string) =
   of "js":
     # only run the JS tests on Windows or Linux because Travis is bad
     # and other OSes like Haiku might lack nodejs:
-    when defined(linux) or defined(windows):
+    if not defined(linux) and isTravis:
+      discard
+    else:
       jsTests(r, cat, options)
   of "dll":
     dllTests(r, cat, options)
diff --git a/tests/testament/specs.nim b/tests/testament/specs.nim
index ac79e3942..fbe930a4f 100644
--- a/tests/testament/specs.nim
+++ b/tests/testament/specs.nim
@@ -12,8 +12,8 @@ import parseutils, strutils, os, osproc, streams, parsecfg
 
 var compilerPrefix* = "compiler" / "nim "
 
-let isTravis = existsEnv("TRAVIS")
-let isAppVeyor = existsEnv("APPVEYOR")
+let isTravis* = existsEnv("TRAVIS")
+let isAppVeyor* = existsEnv("APPVEYOR")
 
 proc cmdTemplate*(): string =
   compilerPrefix & "$target --lib:lib --hints:on -d:testing $options $file"
diff --git a/tests/threads/tactors.nim b/tests/threads/tactors.nim
index 45a03ebb7..ea052b9bd 100644
--- a/tests/threads/tactors.nim
+++ b/tests/threads/tactors.nim
@@ -5,9 +5,9 @@ discard """
 import actors
 
 var
-  pool: TActorPool[int, void]
+  pool: ActorPool[int, void]
 createActorPool(pool)
-for i in 0 .. < 300:
+for i in 0 ..< 300:
   pool.spawn(i, proc (x: int) {.thread.} = echo x)
 pool.join()
 
diff --git a/tests/tuples/tuple_with_nil.nim b/tests/tuples/tuple_with_nil.nim
index ec48337bd..e09c53407 100644
--- a/tests/tuples/tuple_with_nil.nim
+++ b/tests/tuples/tuple_with_nil.nim
@@ -73,7 +73,7 @@ type
 
 const
   DefaultPrec = 6 ## Default precision for floating point numbers.
-  DefaultFmt: Format = (ftDefault, -1, -1, nil, faDefault, fsMinus, false, false, false, nil)
+  DefaultFmt: Format = (ftDefault, -1, -1, "", faDefault, fsMinus, false, false, false, "")
     ## Default format corresponding to the empty format string, i.e.
     ##   `x.format("") == x.format(DefaultFmt)`.
   round_nums = [0.5, 0.05, 0.005, 0.0005, 0.00005, 0.000005, 0.0000005, 0.00000005]
@@ -124,7 +124,7 @@ proc parse(fmt: string): Format {.nosideeffect.} =
   if fmt.rawmatch(p, 0, caps) < 0:
     raise newException(FormatError, "Invalid format string")
 
-  result.fill = fmt.get(caps, 0, nil)
+  result.fill = fmt.get(caps, 0, "")
 
   case fmt.get(caps, 1, 0.char)
   of '<': result.align = faLeft
@@ -144,7 +144,7 @@ proc parse(fmt: string): Format {.nosideeffect.} =
   result.width = fmt.get(caps, 4, -1)
 
   if caps.has(4) and fmt[caps.bounds(4).first] == '0':
-    if result.fill != nil:
+    if result.fill != "":
       raise newException(FormatError, "Leading 0 in with not allowed with explicit fill character")
     if result.align != faDefault:
       raise newException(FormatError, "Leading 0 in with not allowed with explicit alignment")
@@ -171,7 +171,7 @@ proc parse(fmt: string): Format {.nosideeffect.} =
   of '%': result.typ = ftPercent
   else: result.typ = ftDefault
 
-  result.arysep = fmt.get(caps, 8, nil, 1)
+  result.arysep = fmt.get(caps, 8, "", 1)
 
 proc getalign(fmt: Format; defalign: FmtAlign; slen: int) : tuple[left, right:int] {.nosideeffect.} =
   ## Returns the number of left and right padding characters for a
@@ -218,7 +218,7 @@ proc writefill(o: var Writer; fmt: Format; n: int; signum: int = 0) =
     elif fmt.sign == fsPlus: write(o, '+')
     elif fmt.sign == fsSpace: write(o, ' ')
 
-  if fmt.fill == nil:
+  if fmt.fill.len == 0:
     for i in 1..n: write(o, ' ')
   else:
     for i in 1..n:
@@ -626,19 +626,19 @@ proc splitfmt(s: string): seq[Part] {.compiletime, nosideeffect.} =
       else:
         lvl.dec
     let clpos = pos
-    var fmtpart = Part(kind: pkFmt, arg: -1, fmt: s.substr(oppos+1, clpos-1), field: nil, index: int.high, nested: nested)
+    var fmtpart = Part(kind: pkFmt, arg: -1, fmt: s.substr(oppos+1, clpos-1), field: "", index: int.high, nested: nested)
     if fmtpart.fmt.len > 0:
       var m: array[0..3, string]
       if not fmtpart.fmt.match(subpeg, m):
         error("invalid format string")
 
-      if m[1] != nil and m[1].len > 0:
+      if m[1].len > 0:
         fmtpart.field = m[1].substr(1)
-      if m[2] != nil and m[2].len > 0:
+      if m[2].len > 0:
         discard parseInt(m[2].substr(1, m[2].len-2), fmtpart.index)
 
       if m[0].len > 0: discard parseInt(m[0], fmtpart.arg)
-      if m[3] == nil or m[3].len == 0:
+      if m[3].len == 0:
         fmtpart.fmt = ""
       elif m[3][0] == ':':
         fmtpart.fmt = m[3].substr(1)
@@ -650,7 +650,7 @@ proc splitfmt(s: string): seq[Part] {.compiletime, nosideeffect.} =
 proc literal(s: string): NimNode {.compiletime, nosideeffect.} =
   ## Return the nim literal of string `s`. This handles the case if
   ## `s` is nil.
-  result = if s == nil: newNilLit() else: newLit(s)
+  result = newLit(s)
 
 proc literal(b: bool): NimNode {.compiletime, nosideeffect.} =
   ## Return the nim literal of boolean `b`. This is either `true`
@@ -713,7 +713,7 @@ proc generatefmt(fmtstr: string;
           args[arg].cnt = args[arg].cnt + 1
           arg.inc
         # possible field access
-        if part.field != nil and part.field.len > 0:
+        if part.field.len > 0:
           argexpr = newDotExpr(argexpr, part.field.ident)
         # possible array access
         if part.index < int.high:
@@ -724,7 +724,7 @@ proc generatefmt(fmtstr: string;
           # nested format string. Compute the format string by
           # concatenating the parts of the substring.
           for e in generatefmt(part.fmt, args, arg):
-            var newexpr = if part.fmt == nil: e.val else: newCall(bindsym"format", e.val, e.fmt)
+            var newexpr = if part.fmt.len == 0: e.val else: newCall(bindsym"format", e.val, e.fmt)
             if fmtexpr != nil and fmtexpr.kind != nnkNilLit:
               fmtexpr = infix(fmtexpr, "&", newexpr)
             else:
diff --git a/tests/tuples/tuple_with_seq.nim b/tests/tuples/tuple_with_seq.nim
index 39edb500f..00b07dd2c 100644
--- a/tests/tuples/tuple_with_seq.nim
+++ b/tests/tuples/tuple_with_seq.nim
@@ -3,8 +3,8 @@ discard """
 @[1, 2, 3]'''
 """
 
-template foo(s: string = nil) =
-  if isNil(s):
+template foo(s: string = "") =
+  if s.len == 0:
     echo "it's nil"
   else:
     echo s
diff --git a/tests/types/temptyseqs.nim b/tests/types/temptyseqs.nim
index 834f63729..28c3b87b8 100644
--- a/tests/types/temptyseqs.nim
+++ b/tests/types/temptyseqs.nim
@@ -22,7 +22,7 @@ when true:
   import os
 
   type
-    In_out = tuple[src, dest, options: string]
+    In_out = tuple[src, dest: string, options: ref int]
 
   let
     nil_var: In_out = ("hey"/"there", "something", nil)
diff --git a/tests/vm/meta.nim b/tests/vm/meta.nim
index 2aa01b5b3..32a441f27 100644
--- a/tests/vm/meta.nim
+++ b/tests/vm/meta.nim
@@ -39,7 +39,7 @@ proc newIdent*(node: NimNode): Ident =
       raise newException(ValueError, msg)
 
 proc render*(i: Ident): NimNode {.compileTime.} =
-  if i.name == nil:
+  if i.name == "":
     return newNimNode(nnkEmpty)
 
   if i.exported:
@@ -67,7 +67,7 @@ proc newBracket*(node: NimNode): Bracket =
       raise newException(ValueError, msg)
 
 # Field procs
-proc newField*(identifier: Ident, type_name: string, default: string = nil): Field =
+proc newField*(identifier: Ident, type_name: string, default: string = ""): Field =
   result.identifier = identifier
   result.type_name = type_name
   result.default = default
@@ -84,7 +84,7 @@ proc newField*(node: NimNode): Field =
         of nnkIdent:
           result.default = $(node[2])
         else:
-          result.default = nil
+          result.default = ""
     else:
       let msg = "newField cannot initialize from node kind: " & $(node.kind)
       raise newException(ValueError, msg)
@@ -102,7 +102,7 @@ proc newFieldSeq*(node: NimNode): FieldSeq =
         of nnkIdent:
           default = $(default_node)
         else:
-          default = nil
+          default = ""
       for i in 0..node.len - 3:
         let name = newIdent(node[i])
         result.add(newField(name, type_name, default))
@@ -115,8 +115,8 @@ proc newFieldSeq*(node: NimNode): FieldSeq =
 
 proc render*(f: Field): NimNode {.compileTime.} =
   let identifier = f.identifier.render()
-  let type_name = if f.type_name != nil: ident(f.type_name) else: newEmptyNode()
-  let default = if f.default != nil: ident(f.default) else: newEmptyNode()
+  let type_name = if f.type_name != "": ident(f.type_name) else: newEmptyNode()
+  let default = if f.default != "": ident(f.default) else: newEmptyNode()
   newIdentDefs(identifier, type_name, default)
 
 proc render*(fs: FieldSeq): NimNode {.compileTime.} =
@@ -127,7 +127,7 @@ proc render*(fs: FieldSeq): NimNode {.compileTime.} =
 # TypeDef procs
 proc newTypeDef*(identifier: Ident, is_ref = false,
                 object_type = "object",
-                base_type: string = nil): TypeDef {.compileTime.} =
+                base_type: string = ""): TypeDef {.compileTime.} =
   result.identifier = identifier
   result.fields = @[]
   result.is_ref = is_ref
@@ -165,7 +165,7 @@ proc render*(typedef: TypeDef): NimNode {.compileTime.} =
   result.add(newEmptyNode())
   let object_node = newNimNode(nnkObjectTy)
   object_node.add(newEmptyNode())
-  if typedef.base_type == nil:
+  if typedef.base_type == "":
     object_node.add(newEmptyNode())
   else:
     var base_type = newNimNode(nnkOfInherit)
@@ -195,8 +195,8 @@ proc render*(typeseq: TypeDefSeq): NimNode {.compileTime.} =
   for typedef in typeseq:
     result.add(typedef.render())
 
-proc newProc*(identifier: Ident, params: FieldSeq = nil,
-              returns: Ident, generics: FieldSeq = nil): Proc =
+proc newProc*(identifier: Ident, params: FieldSeq = @[],
+              returns: Ident, generics: FieldSeq = @[]): Proc =
   result.identifier = identifier
   result.params = params
   result.returns = returns
@@ -209,7 +209,7 @@ proc newProc*(node: NimNode): Proc =
       case node[2].kind:
         of nnkGenericParams:
           result.generics = newFieldSeq(node[2])
-        else: result.generics = nil
+        else: result.generics = @[]
       let formal_params = node[3]
       case formal_params[0].kind:
         of nnkIdent:
diff --git a/tests/vm/tcomponent.nim b/tests/vm/tcomponent.nim
index e7962e7ab..b509bc5d7 100644
--- a/tests/vm/tcomponent.nim
+++ b/tests/vm/tcomponent.nim
@@ -11,7 +11,7 @@ FOO: blah'''
 
 import macros, sequtils, tables
 import strutils
-import future, meta
+import sugar, meta
 
 type
   Component = object
diff --git a/tests/vm/tseq_badinit.nim b/tests/vm/tseq_badinit.nim
index 15889d60e..5fa223c85 100644
--- a/tests/vm/tseq_badinit.nim
+++ b/tests/vm/tseq_badinit.nim
@@ -22,14 +22,14 @@ template test(typename, default: untyped) =
     result = newSeq[typename]()
     result.add(default)
     result.setLen(3)
-    for i in 0 .. <2:
+    for i in 0 ..< 2:
       result[i] = default
 
   const constval = `abc typename`()
   doAssert(constval == `abc typename`())
 
   proc `arr typename`(): array[4, typename] =
-    for i in 0 .. <2:
+    for i in 0 ..< 2:
       result[i] = default
   const constarr = `arr typename`()
   doAssert(constarr == `arr typename`())
diff --git a/tests/vm/tstringnil.nim b/tests/vm/tstringnil.nim
index 39e4040dc..df408910e 100644
--- a/tests/vm/tstringnil.nim
+++ b/tests/vm/tstringnil.nim
@@ -20,16 +20,16 @@ proc buildSuiteContents(suiteName, suiteDesc, suiteBloc: NimNode): tuple[tests:
 
       var testObj = SuiteTest()
       if suiteName.kind == nnkNilLit:
-        testObj.suiteName = nil
+        testObj.suiteName = ""
       else:
         testObj.suiteName = $suiteName
       if suiteDesc.kind == nnkNilLit:
-        testObj.suiteDesc = nil
+        testObj.suiteDesc = ""
       else:
         testObj.suiteDesc = suiteDesc.strVal
       testObj.testName = $child[1] # should not ever be nil
       if child[2].kind == nnkNilLit:
-        testObj.testDesc = nil
+        testObj.testDesc = ""
       else:
         testObj.testDesc = child[2].strVal
       testObj.testBlock = child[1]
@@ -46,5 +46,5 @@ macro suite(suiteName, suiteDesc, suiteBloc: untyped): typed =
 
 # Test above
 suite basics, "Description of such":
-  test(t5, nil):
+  test(t5, ""):
     assert false