fix callable enum narrowing - #21946
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Diff from mypy_primer, showing the effect of this PR on open source code: scipy (https://github.com/scipy/scipy)
- scipy/conftest.py:678: error: "Literal['skip']" not callable [misc]
+ scipy/conftest.py:678: error: "str" not callable [operator]
- scipy/conftest.py:678: error: "Literal['xfail']" not callable [misc]
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Fixes ##17222
Narrowing an enum to a literal(with ``==
ormatch`) gives a `LiteralType`, which was not being checked when type checking a call. This PR add a `LiteralType` branch to `check_call` that will delegate to its `fallback` instance.