This PR replaces explicit `os.path.exists(...)` checks with
`os.makedirs(..., exist_ok=True)` w...

Fixes #16630

This is basically a pre-existing bug and affects other errors that
ASTConverter might raise, li...

Closes https://github.com/python/mypy/issues/16586
CC @ikonst

Preparation step for the 1.8.0 release.

Once class C is final, we know that a derived class won't add a
`__bool__` or a `__len__` so if...

Fixes #15148

I think it also fixes the [initial
bug](https://github.com/python/mypy/issues/1...

Fixes https://github.com/python/mypy/issues/16466

Followup to #16598

This is allegedly causing large performance problems, see 13821

typeshed/8231 had zero hits on ...

Since the plugin provides superior type checking: https://github.com/python/mypy/pull/13987#issue...

Source commit:
https://github.com/python/typeshed/commit/5f12eebda4bfddb247c05fb06c6762bd262a9420

Stubtest's tests will start failing when `typing_extensions==4.9.0`
comes out, due to some new ...

This addresses several regressions identified in
https://github.com/python/mypy/issues/16486

...

I saw a bunch of warnings when running tests in parallel using pytest.
When running tests seque...

Fixes #13238

See also https://github.com/python/typeshed/issues/8988

This showed up as hot spot in a CPU profile collected when running
tests.

This makes `mypy/t...

Move some definitions away from commonly used fixtures that are only
needed in one or two test ...

Refs #16521

Default value of `MANY_ERRORS_THRESHOLD` was set to `-1` in
https://github.com/python/mypy/pull...

Fixes https://github.com/python/mypy/issues/16187

Note there may be some more similar crashes...

Fixes https://github.com/python/mypy/issues/16512

The problems were caused if same callback p...

Fixes https://github.com/python/mypy/issues/16485

My initial implementation of imprecise cons...

Fixes https://github.com/python/mypy/issues/16420

Although this is not 100% clear yet, but af...

See python/cpython#87233

Followup from
https://github.com/python/mypy/pull/16457/files#r1392715784

Source commit:

https://github.com/python/typeshed/commit/643d911f4fb434176c7f6a342db910943125...

Fixes https://github.com/python/mypy/issues/16163

Fix is straightforward: I simply copy the l...

Fixes https://github.com/python/mypy/issues/16498

Fix is trivial: no operations can be done w...

Fixes https://github.com/python/mypy/issues/16480

Fix is straightforward, but also suspicious...

Fixes https://github.com/python/mypy/issues/16473

Potentially we can turn this helper functio...

Fixes https://github.com/python/mypy/issues/16405
Fixes https://github.com/python/mypy/issues/1...

Fixes https://github.com/python/mypy/issues/16451

This special-casing is unfortunate, but thi...

Lets the Markdown renderer highlight the code as Python rather than
leaving it un-highlighted :...

I've noticed that `TypedDict` and `NamedTuple` classes are special cased
during semantic analyz...

Fixes https://github.com/python/mypy/issues/16468

The fix is straightforward.

Btw when fix...

Fixes https://github.com/python/mypy/issues/9910
Fixes https://github.com/python/mypy/issues/16...

There are several `TODO` items for the future (not in this PR):
- [ ] Add an error code to disa...

Fixes #16414

We should probably lean into the type checker harder here

Fixes #14950
Fixes
https://github...

This is needed for the Debian package of mypy, as we package the docs
and we have upgraded to S...

Fixes https://github.com/python/mypy/issues/16450

The fix is a bit ad-hoc, but OTOH there is ...

I also updated the blog post.

We are now very close to release.

This is an adaptation of an older script that we used to convert from a
Paper doc to HTML.

T...

Address feedback and include recently cherry-picked PRs.

Fixes https://github.com/python/mypy/issues/16425

Fix is straightforward.

Fixes https://github.com/python/mypy/issues/16427

The test case added in the first commit cra...

Add sections covering bigger changes.

Add sections for related changes. Remove some internal changes and make
other small tweaks.

Generated using `misc/generate_changelog.py`.

The script format changelog entries based on commit history and has some
rules to filter out so...

Fixes https://github.com/python/mypy/issues/3208

Interestingly, we already prohibit this when...

https://github.com/python/mypy/pull/16388/ changed the definition of
`write_junit_xml` but miss...

#16388 introduced a bug where, with `--junit-format=global`, the junit
file would indicate an e...

Fixes https://github.com/python/mypy/issues/4297

Fix is straightforward: without properly pus...

Adds a new `--junit-format` flag to MyPy, which affects the structure of
the junit file written...

Now all messages use the same `"super"` formatting, it used to be a bit
different.

Fixes https://github.com/python/mypy/issues/16395

Fixes https://github.com/python/mypy/issues/15794

Unfortunately, this requires to pass `--exp...

Fixes https://github.com/python/mypy/issues/16380

Fix is quite straightforward, what was an `...

Fixes https://github.com/python/mypy/issues/16375

Source commit:

https://github.com/python/typeshed/commit/3c872ca8fd875f2dc5fe5f5d771e35c58390...

Fixes #10314

If a submodule has been deleted while using a fine-grained cache, the
daemon could crash during...

Fixes https://github.com/python/mypy/issues/12280
Fixes https://github.com/python/mypy/issues/1...

Fixes https://github.com/python/mypy/issues/15780

Fixes https://github.com/python/mypy/issues/15781

The fix is to switch to already resolved pa...

Fixes https://github.com/python/mypy/issues/16336

All the story with `@`-names is a mess. FWI...

This PR removes one of the duplicate **in** in the sentence "This option
is only useful in in t...

The upper bound is usually `object`, so add a fast path and skip a
potentially slow subtype che...

Fixes #16318, as requested by setuptools maintainer

The check was pretty expensive, though usually it's not doing anything
non-trivial. Added a fas...

We used to check if a file is in typeshed a lot. This seems to speed up
self-check by about 2%,...

I decided to go again over various parts of variadic types
implementation to double-check nothi...

We were spending quite a lot of time in this function when running
tests, based on profiling.

Fixes https://github.com/python/mypy/issues/15906

I am adding `--old-type-inference` so peopl...

FWIW I decided to keep the old tests (where possible), just to be sure
we will not re-introduce...

Fixes https://github.com/python/mypy/issues/16287

Update mypy's error on starred expression t...

Fixes https://github.com/python/mypy/issues/16338

This is kind of a major change, but it is t...

This is to ensure that you don't get encoding errors if docstrings
contains odd characters like...

Fixes https://github.com/python/mypy/issues/16285

I was not sure if it is important to suppor...

Fixes https://github.com/python/mypy/issues/16331

Fix is straightforward: do not use the fall...

Previously changing a return type to an optional type was not propagated
at least in some cases...

Previously we produced duplicate functions in C, which caused C
compiler errors.

The 3.8 tests have been flaking for several weeks and I don't think
anyone has a good repro or ...

This is an attempt to fix wheel builds. Perhaps we'd want to actually
include the changelog in ...

Please, note that there are several problems with `__ror__` definitions.
1. `dict.__ror__` does...

Fixes https://github.com/python/mypy/issues/16296

In my big refactoring I flipped the varianc...

Closes https://github.com/python/mypy/issues/16307.

Skip them instead. This applies to statements after break, continue,
return and raise statement...

The semantic analyzer treats properties as overloaded functions. This
was previously ignored by...

Fixes #1178
Supersedes #10367

This is includes implementation for fixed length tuples, hom...