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## Summary Allow a typevar to be callable if it is bound to a callable type, or constrained to callable types. I spent some time digging into why this support didn't fall out naturally, and ultimately the reason is that we look up `__call__` on the meta type (since its a dunder), and our implementation of `Type::to_meta_type` for `Type::Callable` does not return a type with `__call__`. A more general solution here would be to have `Type::to_meta_type` for `Type::Callable` synthesize a protocol with `__call__` and return an intersection with that protocol (since for a type to be callable, we know its meta-type must have `__call__`). That solution could in principle also replace the special-case handling of `Type::Callable` itself, here in `Type::bindings`. But that more general approach would also be slower, and our protocol support isn't quite ready for that yet, and handling this directly in `Type::bindings` is really not bad. Fixes https://github.com/astral-sh/ty/issues/480 ## Test Plan Added mdtests. |
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