commit f7ed4d4e83f5d9e85e244a1cbc460f26436ab24d
author Shantanu <hauntsaninja@users.noreply.github.com> Sat Jun 06 03:08:48 2020 -0700
committer GitHub <noreply@github.com> Sat Jun 06 11:08:48 2020 +0100
tree de469bc0aa35508ca96bfaa8dd5e4cda290d925f
parent c067183605cf84bb1a246635f52827251d0476f8

bpo-40614: Respect feature version for f-string debug expressions (GH-20196) (GH-20466)

Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>
Co-authored-by: Pablo Galindo <pablogsal@gmail.com>
(cherry picked from commit c116c94ff119485761460f1033cdee425bed0310)

Python/ast.c

diff --git a/Python/ast.c b/Python/ast.c
index f70d48b..594879b 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -5202,6 +5202,12 @@
     /* Check for =, which puts the text value of the expression in
        expr_text. */
     if (**str == '=') {
+        if (c->c_feature_version < 8) {
+            ast_error(c, n,
+                      "f-string: self documenting expressions are "
+                      "only supported in Python 3.8 and greater");
+            goto error;
+        }
         *str += 1;
 
         /* Skip over ASCII whitespace.  No need to test for end of string