I think there's a problem when inferring the type of an argument that is a function with named return values.

For example, this shows no errors as expected:

func foo(fn func() error) { err := fn() err.Error() } 

However this shows an err on the err.Error() line:

func foo(fn func() (myErr error)) { err := fn() err.Error() } 

like so:

Probably because it seems to think that err has the type func() (myErr error):

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