Add test for #1836

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/iter/tconcat.nim b/tests/iter/tconcat.nim
new file mode 100644
index 000000000..c0dab5719
--- /dev/null
+++ b/tests/iter/tconcat.nim
@@ -0,0 +1,17 @@
+discard """
+  output: '''DabcD'''
+"""
+
+proc toIter*[T](s: Slice[T]): iterator: T =
+  iterator it: T {.closure.} =
+    for x in s.a..s.b:
+      yield x
+  return it
+
+iterator concat*[T](its: varargs[T, toIter]): auto =
+  for i in its:
+    for x in i():
+      yield x
+
+for i in concat(1..4, 20..23):
+  echo i