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Don't crash on double-underscore-prefixed keyword arg #6736

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Merged
merged 1 commit into from
Apr 28, 2019
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Don't crash on double-underscore-prefixed keyword arg #6736

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3 changes: 1 addition & 2 deletions mypy/checkexpr.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1138,8 +1138,7 @@ def check_argument_count(self,
not is_unexpected_arg_error):
# No actual for a mandatory named formal
if messages:
argname = callee.arg_names[i]
assert argname is not None
argname = callee.arg_names[i] or "?"
messages.missing_named_argument(callee, context, argname)
ok = False
elif kind in [nodes.ARG_POS, nodes.ARG_OPT,
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