attempt to fix #16374 (#17232)

* remove unnecessary when statement

* remove outdated codes

* attempt to fix #16374

* fix

1 files changed, 38 insertions, 0 deletions

diff --git a/tests/ccgbugs/t16374.nim b/tests/ccgbugs/t16374.nim
new file mode 100644
index 000000000..8ccfa4815
--- /dev/null
+++ b/tests/ccgbugs/t16374.nim
@@ -0,0 +1,38 @@
+discard """
+  matrix: "--gc:refc; --gc:orc"
+"""
+
+block:
+  iterator mvalues(t: var seq[seq[int]]): var seq[int] =
+    yield t[0]
+
+  var t: seq[seq[int]]
+
+  while false:
+    for v in t.mvalues:
+      discard
+
+  proc ok =
+    while false:
+      for v in t.mvalues:
+        discard
+
+  ok()
+
+block:
+  iterator mvalues(t: var seq[seq[int]]): lent seq[int] =
+    yield t[0]
+
+  var t: seq[seq[int]]
+
+  while false:
+    for v in t.mvalues:
+      discard
+
+  proc ok =
+    while false:
+      for v in t.mvalues:
+        discard
+
+  ok()
+