1 files changed, 70 insertions, 0 deletions
diff --git a/tests/arc/tdup.nim b/tests/arc/tdup.nim
new file mode 100644
index 000000000..3f64061fb
--- /dev/null
+++ b/tests/arc/tdup.nim
@@ -0,0 +1,70 @@
+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`(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 inc(x: sink Ref) =
+  inc x.id
+
+proc inc(x: sink RefCustom) =
+  inc x.id[]
+
+proc `=dup`(x: var RefCustom): RefCustom =
+  result.id = 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()