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support Callable / callable Protocols in suggest decorator unwarpping #19072

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Resolves #18940

while I feel like just accepting any identity function would be good enough I expanded the check to explicitly allow Callables and Protocol callables

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@@ -659,7 +671,7 @@ def extract_from_decorator(self, node: Decorator) -> FuncDef | None:
for ct in typ.items:
if not (
len(ct.arg_types) == 1
and isinstance(ct.arg_types[0], TypeVarType)
and _arg_accepts_function(get_proper_type(ct.arg_types[0]))
and ct.arg_types[0] == ct.ret_type
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Can this become is_same_type to allow aliases?

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I assume you mean the == line?

probably! but that'd be a separate issue / patch I would imagine

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Yes, sorry, misclicked - I meant the == line of course.

@@ -659,7 +671,7 @@ def extract_from_decorator(self, node: Decorator) -> FuncDef | None:
for ct in typ.items:
if not (
len(ct.arg_types) == 1
and isinstance(ct.arg_types[0], TypeVarType)
and _arg_accepts_function(get_proper_type(ct.arg_types[0]))
and ct.arg_types[0] == ct.ret_type
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Yes, sorry, misclicked - I meant the == line of course.

Co-authored-by: Stanislav Terliakov <[email protected]>
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I think batching is_same_type here would be appropriate, but don't mind deferring that to a separate PR if you'd prefer. LG, thanks!

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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅

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dmypy gives up on trivial decorator
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