Add and use a simple extension trait derive macro in the compiler #121059
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Some changes occurred in engine.rs, potentially modifying the public API of Some changes occurred to the core trait solver cc @rust-lang/initiative-trait-system-refactor |
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cool shit, errs |
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…twco,Nilstrieb
Add and use a simple extension trait derive macro in the compiler
Adds `#[extension]` to `rustc_macros` for implementing an extension trait. This expands an impl (with an optional visibility) into two parallel trait + impl definitions.
before:
```rust
pub trait Extension {
fn a();
}
impl Extension for () {
fn a() {}
}
```
to:
```rust
#[extension]
pub impl Extension for () {
fn a() {}
}
```
Opted to just implement it by hand because I couldn't figure if there was a "canonical" choice of extension trait macro in the ecosystem. It's really lightweight anyways, and can always be changed.
I'm interested in adding this because I'd like to later split up the large `TypeErrCtxtExt` traits into several different files. This should make it one step easier.
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Rollup of 8 pull requests Successful merges: - rust-lang#119032 (Use a hardcoded constant instead of calling OpenProcessToken.) - rust-lang#120932 (const_mut_refs: allow mutable pointers to statics) - rust-lang#121059 (Add and use a simple extension trait derive macro in the compiler) - rust-lang#121135 (coverage: Discard spans that fill the entire function body) - rust-lang#121187 (Add examples to document the return type of quickselect functions) - rust-lang#121191 (Add myself to review rotation (and a rustbot ping)) - rust-lang#121192 (Give some intrinsics fallback bodies) - rust-lang#121197 (Ensure `./configure` works when `configure.py` path contains spaces) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#121059 - compiler-errors:extension, r=davidtwco,Nilstrieb Add and use a simple extension trait derive macro in the compiler Adds `#[extension]` to `rustc_macros` for implementing an extension trait. This expands an impl (with an optional visibility) into two parallel trait + impl definitions. before: ```rust pub trait Extension { fn a(); } impl Extension for () { fn a() {} } ``` to: ```rust #[extension] pub impl Extension for () { fn a() {} } ``` Opted to just implement it by hand because I couldn't figure if there was a "canonical" choice of extension trait macro in the ecosystem. It's really lightweight anyways, and can always be changed. I'm interested in adding this because I'd like to later split up the large `TypeErrCtxtExt` traits into several different files. This should make it one step easier.
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Adds
#[extension]torustc_macrosfor implementing an extension trait. This expands an impl (with an optional visibility) into two parallel trait + impl definitions.before:
to:
Opted to just implement it by hand because I couldn't figure if there was a "canonical" choice of extension trait macro in the ecosystem. It's really lightweight anyways, and can always be changed.
I'm interested in adding this because I'd like to later split up the large
TypeErrCtxtExttraits into several different files. This should make it one step easier.