[3.8] bpo-39579: Fix Attribute end_col_offset to point at the current node (GH-18405) (GH-18408)



(cherry picked from commit d2e1098641f98594702ef29049c3c4a3f394786f)





https://bugs.python.org/issue39579



Automerge-Triggered-By: @gvanrossum
diff --git a/Python/ast.c b/Python/ast.c
index f3263c1..12f24f2 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -1715,11 +1715,12 @@
         return NULL;
 
     for (i = 2; i < NCH(n); i+=2) {
-        id = NEW_IDENTIFIER(CHILD(n, i));
+        const node *child = CHILD(n, i);
+        id = NEW_IDENTIFIER(child);
         if (!id)
             return NULL;
         e = Attribute(e, id, Load, lineno, col_offset,
-                      n->n_end_lineno, n->n_end_col_offset, c->c_arena);
+                      child->n_end_lineno, child->n_end_col_offset, c->c_arena);
         if (!e)
             return NULL;
     }