David Peter d8538d8c98 [red-knot] Narrowing for type(x) is C checks (#14432) ...

## Summary

Add type narrowing for `type(x) is C` conditions (and `else` clauses of
`type(x) is not C` conditionals):

```py
if type(x) is A:
    reveal_type(x)  # revealed: A
else:
    reveal_type(x)  # revealed: A | B
```

closes: #14431, part of: #13694

## Test Plan

New Markdown-based tests.

2024-11-18 16:21:46 +01:00

..

conditionals

[red-knot] Shorten the paths for some mdtest files (#14267)

2024-11-11 11:34:33 +00:00

boolean.md

[red-knot] have mdformat wrap mdtest files to 100 columns (#14020)

2024-10-31 21:00:51 +00:00

isinstance.md

[red-knot] have mdformat wrap mdtest files to 100 columns (#14020)

2024-10-31 21:00:51 +00:00

issubclass.md

[red-knot] Diagnostic for possibly unbound imports (#14281)

2024-11-11 20:26:01 +01:00

match.md

[red-knot] Remove lint-phase (#13922)

2024-10-25 18:40:52 +00:00

type.md

[red-knot] Narrowing for type(x) is C checks (#14432)

2024-11-18 16:21:46 +01:00