rust-lang / rust-lang/rustc_public
Add an API to check if a `Ty` implements a trait
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- Dominant language
- Rust
- Stars
- 125
- Forks
- 19
- PR merge metrics
- No merged PRs in 30d
Description
It can be handy to have an API that checks if a type implements a trait to not. Basic use cases include checking if the type implements some of the language-built-in marker traits like Copy.
The API can be added to Ty as follows.
fn implements(&self, def: TraitDef, generics: GenericArgs, param_env: ???) -> bool;
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by locating Ty and existing handling for TraitDef and GenericArgs in rustc_public, then determine what param_env must represent for trait queries. Done means exposing the proposed implements API and confirming it can report whether a Ty implements marker traits such as Copy.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- compilers
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100