dmypy suggest should not suggest for abstract methods?

[asottile-sentry]

Bug Report

with --no-errors the suggestions from dmypy suggest for abstract methods can lead to type errors

To Reproduce

import abc

class C:
    @abc.abstractmethod
    def get_key(self): pass

class D(C):
    def get_key(self):
        return 'key'

Expected Behavior

either no suggestion or () -> str for t.C.get_key

Actual Behavior

$ dmypy run t.py
...
$ dmypy suggest t.D.get_key
() -> str
$ dmypy suggest t.C.get_key
() -> None

applying both of these suggestions results in a type error:

$ mypy t.py
t.py:8: error: Return type "str" of "get_key" incompatible with return type "None" in supertype "C"  [override]
Found 1 error in 1 file (checked 1 source file)

Your Environment

• Mypy version used: 1.15.0
• Mypy command-line flags: see above
• Mypy configuration options from mypy.ini (and other config files): n/a
• Python version used: 3.13.1

[sterliakov]

dmypy suggest only considers calls and signatures in supertypes, so this logic doesn't consider subclasses and can't help annotate abstract methods. I agree that the easy sane solution is to skip suggesting @abstractmethod signature, or at least avoid suggesting -> None for abstract methods with empty body.