gh-99341: Cover type ignore nodes when incrementing line numbers (GH-99422)

1 files changed, 6 insertions, 0 deletions

diff --git a/Lib/ast.py b/Lib/ast.py
index 1a94e93..2cbc80a 100644
--- a/Lib/ast.py
+++ b/Lib/ast.py
@@ -237,6 +237,12 @@ def increment_lineno(node, n=1):
     location in a file.
     """
     for child in walk(node):
+        # TypeIgnore is a special case where lineno is not an attribute
+        # but rather a field of the node itself.
+        if isinstance(child, TypeIgnore):
+            child.lineno = getattr(child, 'lineno', 0) + n
+            continue
+
         if 'lineno' in child._attributes:
             child.lineno = getattr(child, 'lineno', 0) + n
         if (