From 6c3e66a34b95fff07df0ad5086104dd637a091ce Mon Sep 17 00:00:00 2001
From: Pablo Galindo <Pablogsal@gmail.com>
Date: Wed, 30 Oct 2019 11:53:26 +0000
Subject: bpo-38640: Allow break and continue in always false while loops
 (GH-16992)

---
 Python/compile.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'Python/compile.c')

diff --git a/Python/compile.c b/Python/compile.c
index 3b2188e6e74..f26ad3c7752 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -2738,7 +2738,15 @@ compiler_while(struct compiler *c, stmt_ty s)
 
     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);
-- 
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