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gh-103971: Add unreachable line test for match-case block #103984

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merged 1 commit into from
Apr 28, 2023
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gh-103971: Add unreachable line test for match-case block #103984

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13 changes: 13 additions & 0 deletions Lib/test/test_patma.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3165,6 +3165,19 @@ def f(command): # 0
self.assertListEqual(self._trace(f, "go x"), [1, 2, 3])
self.assertListEqual(self._trace(f, "spam"), [1, 2, 3])

def test_unreachable_code(self):
def f(command): # 0
match command: # 1
case 1: # 2
if False: # 3
return 1 # 4
case _: # 5
if False: # 6
return 0 # 7

self.assertListEqual(self._trace(f, 1), [1, 2, 3])
self.assertListEqual(self._trace(f, 0), [1, 2, 5, 6])

def test_parser_deeply_nested_patterns(self):
# Deeply nested patterns can cause exponential backtracking when parsing.
# See gh-93671 for more information.
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