bpo-38640: Allow break and continue in always false while loops (GH-16992)
(cherry picked from commit 6c3e66a34b95fff07df0ad5086104dd637a091ce)
Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
diff --git a/Python/compile.c b/Python/compile.c
index a512e9c..f09e99f 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -2736,7 +2736,15 @@
if (constant == 0) {
BEGIN_DO_NOT_EMIT_BYTECODE
+ // Push a dummy block so the VISIT_SEQ knows that we are
+ // inside a while loop so it can correctly evaluate syntax
+ // errors.
+ if (!compiler_push_fblock(c, WHILE_LOOP, NULL, NULL)) {
+ return 0;
+ }
VISIT_SEQ(c, stmt, s->v.While.body);
+ // Remove the dummy block now that is not needed.
+ compiler_pop_fblock(c, WHILE_LOOP, NULL);
END_DO_NOT_EMIT_BYTECODE
if (s->v.While.orelse) {
VISIT_SEQ(c, stmt, s->v.While.orelse);