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[flake8-pyi] Implement PYI018 (#6018)

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## Summary

Check for unused private `TypeVar`. See [original
implementation](2a86db8271/pyi.py (L1958)).

```
$ flake8 --select Y018 crates/ruff/resources/test/fixtures/flake8_pyi/PYI018.pyi

crates/ruff/resources/test/fixtures/flake8_pyi/PYI018.pyi:4:1: Y018 TypeVar "_T" is not used
crates/ruff/resources/test/fixtures/flake8_pyi/PYI018.pyi:5:1: Y018 TypeVar "_P" is not used
```

```
$ ./target/debug/ruff --select PYI018 crates/ruff/resources/test/fixtures/flake8_pyi/PYI018.pyi --no-cache

crates/ruff/resources/test/fixtures/flake8_pyi/PYI018.pyi:4:1: PYI018 TypeVar `_T` is never used
crates/ruff/resources/test/fixtures/flake8_pyi/PYI018.pyi:5:1: PYI018 TypeVar `_P` is never used
Found 2 errors.
```
In the file `unused_private_type_declaration.rs`, I'm planning to add
other rules that are similar to `PYI018` like the `PYI046`, `PYI047` and
`PYI049`.

ref #848

## Test Plan

Snapshots and manual runs of flake8.
This commit is contained in:
Victor Hugo Gomes 2023-07-26 19:56:15 -03:00 • committed by GitHub
parent 788643f718
commit c0dbcb3434
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ruff.schema.json generated
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@ -2367,6 +2367,7 @@
"PYI015",
"PYI016",
"PYI017",
"PYI018",
"PYI02",
"PYI020",
"PYI021",