Walkthrough

This set of changes introduces the __class_getitem__ class method to various core and standard library types, enabling them to support generic type subscripting (e.g., Type[T]). The method is implemented across multiple classes, consistently returning a PyGenericAlias constructed from the provided arguments, with necessary import adjustments.

Changes

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant VM
    participant TypeClass
    participant PyGenericAlias

    User->>TypeClass: TypeClass[args] (subscripting)
    TypeClass->>TypeClass: __class_getitem__(cls, args, vm)
    TypeClass->>PyGenericAlias: from_args(cls, args, vm)
    PyGenericAlias-->>TypeClass: PyGenericAlias instance
    TypeClass-->>User: PyGenericAlias instance

Possibly related PRs

• [BREAKING CHANGE] Writing magic method names as full name #5842: Renaming magic methods to explicit Python dunder names in stdlib/src/array.rs; related due to changes in magic method handling in the same module.

Suggested reviewers

• arihant2math

Poem

In the meadow of code, a new trick appears,
Types can be subscripted—let’s all give three cheers!
__class_getitem__ hops in with style,
Making generics easy, mile after mile.
Now rabbits and coders can both exclaim:
"Type[T] works everywhere—oh, what a game!"
🐇✨

Updating git repository `https://github.com/youknowone/ferrilab`

Configuration used: .coderabbit.yml
Review profile: CHILL
Plan: Pro

Reviewing files that changed from the base of the PR and between 625496c and d61ef66.

• Lib/test/test_genericalias.py is excluded by !Lib/**

• stdlib/src/array.rs (2 hunks)
• stdlib/src/contextvars.rs (3 hunks)
• vm/src/builtins/bytearray.rs (2 hunks)
• vm/src/builtins/bytes.rs (2 hunks)
• vm/src/builtins/classmethod.rs (2 hunks)
• vm/src/builtins/coroutine.rs (2 hunks)
• vm/src/builtins/generator.rs (2 hunks)
• vm/src/builtins/memory.rs (2 hunks)
• vm/src/builtins/range.rs (2 hunks)
• vm/src/builtins/slice.rs (2 hunks)
• vm/src/builtins/staticmethod.rs (2 hunks)
• vm/src/builtins/union.rs (2 hunks)
• vm/src/exceptions.rs (2 hunks)
• vm/src/stdlib/functools.rs (2 hunks)

• vm/src/builtins/classmethod.rs
• vm/src/builtins/union.rs
• vm/src/builtins/generator.rs
• stdlib/src/array.rs
• vm/src/builtins/coroutine.rs
• vm/src/builtins/range.rs
• vm/src/builtins/bytearray.rs
• vm/src/builtins/memory.rs
• vm/src/stdlib/functools.rs
• vm/src/builtins/slice.rs
• vm/src/builtins/bytes.rs
• vm/src/builtins/staticmethod.rs
• stdlib/src/contextvars.rs
• vm/src/exceptions.rs

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