From 586f3dbe15139cafb2a6ffb82cea146906561844 Mon Sep 17 00:00:00 2001
From: Irit Katriel <iritkatriel@yahoo.com>
Date: Fri, 25 Dec 2020 17:04:31 +0000
Subject: bpo-28964: add line number of node (if available) to ast.literal_eval
 error messages (GH-23677)

---
 Lib/ast.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'Lib/ast.py')

diff --git a/Lib/ast.py b/Lib/ast.py
index 7275fe28ba..845c80c2bb 100644
--- a/Lib/ast.py
+++ b/Lib/ast.py
@@ -63,7 +63,10 @@ def literal_eval(node_or_string):
     if isinstance(node_or_string, Expression):
         node_or_string = node_or_string.body
     def _raise_malformed_node(node):
-        raise ValueError(f'malformed node or string: {node!r}')
+        msg = "malformed node or string"
+        if lno := getattr(node, 'lineno', None):
+            msg += f' on line {lno}'
+        raise ValueError(msg + f': {node!r}')
     def _convert_num(node):
         if not isinstance(node, Constant) or type(node.value) not in (int, float, complex):
             _raise_malformed_node(node)
-- 
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