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bpo-40904: Fix segfault in the new parser with f-string containing yield statements with no value (GH-20701)

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Pablo Galindo 2020-06-08 01:47:37 +01:00 committed by GitHub
parent bcb198385d
commit 972ab03276
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2
Lib/test/test_fstring.py
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@ -725,9 +725,11 @@ def test_yield(self):
# a function into a generator
def fn(y):
f'y:{yield y*2}'
f'{yield}'
g = fn(4)
self.assertEqual(next(g), 8)
self.assertEqual(next(g), None)
def test_yield_send(self):
def fn(x):

2
Misc/NEWS.d/next/Core and Builtins/2020-06-08-01-08-57.bpo-40904.76qQzo.rst Normal file
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@ -0,0 +1,2 @@
Fix possible segfault in the new PEG parser when parsing f-string containing
yield statements with no value (:code:`f"{yield}"`). Patch by Pablo Galindo

3
Parser/pegen/parse_string.c
View file

@ -278,6 +278,9 @@ static void fstring_shift_argument(expr_ty parent, arg_ty args, int lineno, int
static inline void shift_expr(expr_ty parent, expr_ty n, int line, int col) {
if (n == NULL) {
return;
}
if (parent->lineno < n->lineno) {
col = 0;
}