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[RFC] Remove ClassType <: SelfType subtyping rule#2658

Draft

fangyi-zhou wants to merge 16 commits intofacebook:mainfacebook/pyrefly:mainfrom

fangyi-zhou:self-type-fixfangyi-zhou/pyrefly:self-type-fixCopy head branch name to clipboard

Conversation Commits16 (16)Checks Files changed

Draft

[RFC] Remove ClassType <: SelfType subtyping rule#2658
fangyi-zhou wants to merge 16 commits intofacebook:mainfrom
fangyi-zhou:self-type-fix

Commits

Commits on Mar 5, 2026

Remove the subtyping rule of ClassType <: SelfType
fangyi-zhou
committed
Fix inconsistent overload checks (on self)
fangyi-zhou
committed
Fix inconsistent overload checks (on return type)
fangyi-zhou
committed
Extract `self_type_to_class_type` helper for SelfType-to-ClassType conversion

fangyi-zhou
and
claude
committed
Convert SelfType to ClassType in decorator argument

fangyi-zhou
and
claude
committed
Fix overloaded __init__ with explicit self types resolving to Any

fangyi-zhou
and
claude
committed
Remove some stale debug print
fangyi-zhou
committed
Add regression test
fangyi-zhou
committed
Fix overloaded __init__ with explicit self types resolving to Any

fangyi-zhou
and
claude
committed
Skip overload return type consistency check for class methods

fangyi-zhou
and
claude
committed
cargo fmt
fangyi-zhou
committed
Add a failing pattern in mypy-primer
fangyi-zhou
committed
Preserve SelfType in type_of so type(self)() returns Self

fangyi-zhou
and
claude
committed

Commits on Mar 6, 2026

Validate __init__ self annotation is the defining class or a superclass

fangyi-zhou
and
claude
committed
Validate __init__ and __new__ receiver annotations

fangyi-zhou
and
claude
committed
Document some gap with Enum
fangyi-zhou
committed

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