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PEP 709: Crash with lambda + nested scope #104602
Description
This crashes on main:
def a():
def a():
[(lambda : b) for b in [a]]
print(b)The original reproducer (found with my fork of https://github.com/carljm/compgenerator) was
class a:
def a():
class a:
[(lambda : (a := a[(a := 2)])[b]) for b in (lambda b, a: 7)[a]]
[][2] = b
(1)[lambda a: a] = 4
(2)[2] = b = a
(4)[lambda b, a: b] = a = lambda : 1Found in #104528 (comment) but turned out be unrelated to that PR.
Activity
pythongh-104602: ensure all cellvars are known up front
gh-104602: ensure all cellvars are known up front (#104603)
JelleZijlstra commentedon May 19, 2023
Further fuzzing found this case that was also fixed by #104603:
This one failed as follows:
which is different from the original repro case, which segfaulted. I'll see if I can distill a useful test case out of it.
pythongh-104602: Add additional test for listcomp with lambda
gh-104602: Add additional test for listcomp with lambda (#104639)
Merge branch 'main' into gsallam/main