fixes #22552 (#23014)

1 files changed, 56 insertions, 0 deletions

diff --git a/tests/arc/titeration_doesnt_copy.nim b/tests/arc/titeration_doesnt_copy.nim
new file mode 100644
index 000000000..e1cdb6166
--- /dev/null
+++ b/tests/arc/titeration_doesnt_copy.nim
@@ -0,0 +1,56 @@
+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"