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artiq/lit-test/test/inferencer/error_with_exn.py

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# RUN: %python -m artiq.compiler.testbench.inferencer +diag %s >%t
# RUN: OutputCheck %s --file-to-check=%t
class contextmgr:
def __enter__(self):
pass
def __exit__(self, n1, n2, n3):
n3 = 1
pass
def foo():
# CHECK-L: ${LINE:+2}: error: cannot unify int(width='a) with NoneType
# CHECK-L: ${LINE:+1}: note: exception handling via context managers is not supported; the argument 'n3' of function '__exit__(self:<instance contextmgr {}>, n1:NoneType, n2:NoneType, n3:int(width='a))->NoneType delay('b)' will always be None
with contextmgr():
pass