fixes #1833

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/ccgbugs/twrong_tupleconv.nim b/tests/ccgbugs/twrong_tupleconv.nim
new file mode 100644
index 000000000..68413e96e
--- /dev/null
+++ b/tests/ccgbugs/twrong_tupleconv.nim
@@ -0,0 +1,20 @@
+# bug #1833
+iterator myitems*[T](a: var seq[T]): var T {.inline.} =
+  ## iterates over each item of `a` so that you can modify the yielded value.
+  var i = 0
+  let L = len(a)
+  while i < L:
+    yield a[i]
+    inc(i)
+    assert(len(a) == L, "seq modified while iterating over it")
+
+# Works fine
+var xs = @[1,2,3]
+for x in myitems(xs):
+  inc x
+
+# Tuples don't work
+var ys = @[(1,"a"),(2,"b"),(3,"c")]
+for y in myitems(ys):
+  inc y[0]
+