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terryyin/lizard

The author described this change as “Fix async unparenthesized arrow corrupting parser state in class bodies”. It counts as a record because the check below fails on the code as it stood at ad7ef2f83 and passes on 57e1ac296, with nothing else changed between the two runs.

Projectterryyin/lizard
Fix saved2026-04-22
Sharing licenceMIT · LICENSE.txt
Change size+5 −1

What the code was meant to do, written into the code itself as a save note

Fix async unparenthesized arrow corrupting parser state in class bodies

The change

277277 self.next(self._function, token)
278278 return
279279 # If we've seen async/static and this is an identifier, it's likely a method name
280- elif (self._async_seen or self._static_seen) and token not in ('*', 'function'):
280+ elif (self._async_seen or self._static_seen) and token not in ('*', 'function', '=>'):
281281 if token == '=':
282282 # End of static/async field name — clear modifiers so
283283 # the value expression and subsequent members parse
⋯
415415 self._push_function_to_stack()
416416 # Clear function_name so expression-body ( doesn't re-enter _function
417417 self.function_name = ''
418+ # Clear modifiers so the body's opening { isn't captured by the
419+ # async/static handler in the class body path.
420+ self._async_seen = False
421+ self._static_seen = False
418422 self.next(self._state_global, token)
419423
420424 def _function(self, token):

The check that tells the two apart

fail→pass·test/test_languages/testES6.py::Test_ES6_unparenthesized_arrow_params::test_async_unparenthesized_arrow_complex_body

Check file test/test_languages/testES6.py, taken without changes from the fix and copied onto the older code, so the exact same check runs against both versions.

Origin and history

The fix57e1ac296e2b17b86cd9b5f10cdd56878ced6157
The code before itad7ef2f83ccc06b53be84e585ed047dd5a2a636d
Broken version dated2026-04-22
Modulelizard_languages.typescript
Units changedTypeScriptStates
Fingerprinta3780d1dd1482706
Checked2026-08-18 by goldset/0.1

Every field above is generated by our program. None of it is written by hand.

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