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## Summary
Add support for `Callable` special forms in implicit type aliases.
## Typing conformance
Four new tests are passing
## Ecosystem impact
* All of the `invalid-type-form` errors are from libraries that use
`mypy_extensions` and do something like `Callable[[NamedArg("x", str)],
int]`.
* A handful of new false positives because we do not support generic
specializations of implicit type aliases, yet. But other
* Everything else looks like true positives or known limitations
## Test Plan
New Markdown tests.
Markdown files within the mdtest/ subdirectory are tests of type inference and type checking;
executed by the tests/mdtest.rs integration test.
See crates/ty_test/README.md for documentation of this test format.