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Suggested improvement for wording of an error #3341

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KitB opened this issue May 9, 2017 · 2 comments
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Suggested improvement for wording of an error #3341

KitB opened this issue May 9, 2017 · 2 comments

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@KitB
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KitB commented May 9, 2017

I recently had trouble understanding an error output along the lines of:

Type argument 1 of "<function name>" has incompatible value "<a type that doesn't fit the TypeVar>"

Would it be possible to output something more along the lines of:

TypeVar "T" cannot be a "<wrong type>" (from first argument to "<function name>")
@ilinum
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ilinum commented Jul 7, 2017

I think that's a great suggestion!
TypeVar "<typevar name>" cannot be a "<wrong type>" (from argument 1 to "<function name>")

@KitB are you interested in taking a stab at it yourself? If not, I can work on it.

@KitB
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KitB commented Jul 7, 2017

I don't really have the time, go ahead.

ilinum added a commit to ilinum/mypy that referenced this issue Jul 12, 2017
@ilinum
Improve error message for incompatible TypeVar value
179be5e 
Fixes python#3341
@ilinum ilinum mentioned this issue Jul 12, 2017
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@KitB @ilinum