mypy-nonfloat-decimal broken on `release-0.960`

[rouge8]

Bug Report

mypy-nonfloat-decimal no longer works on 128661c. Mentioned on #12807 (comment), but was told to open an issue. :) I also have an internal plugin using get_dynamic_class_hook() that is no longer working, but that's probably a separate issue and harder to breakdown.

To Reproduce

(Write your steps here:)

1. pip install mypy-nonfloat-decimal https://github.com/python/mypy/archive/128661ccbf4396ed1538421c481f1773c7490169.zip#egg=mypy
2. t.py:

from decimal import Decimal

Decimal(1.2)

3. mypy.ini:

[mypy]
plugins = mypy_nonfloat_decimal

4. mypy t.py

Expected Behavior

t.py:3: error: Invalid type passed to Decimal (expected "Union[int, str, Decimal]"), got builtins.float instead (offender: float)
Found 1 error in 1 file (checked 1 source file)

Actual Behavior

Success: no issues found in 1 source file

Your Environment

• Mypy version used: 128661c
• Mypy command-line flags:
• Mypy configuration options from mypy.ini (and other config files):
• Python version used: 3.10.4
• Operating system and version: macOS 12.3.1

[JelleZijlstra]

This is most likely because of python/typeshed#7640. The plugin needs to look for _decimal.Decimal instead.

[rouge8]

Ah you're right, that one's easy. I'll try and reproduce the internal plugin that no longer seems to work tonight or tomorrow.