Implement multiple traits at once
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Description
A little bit of syntax sugar to make working with trait hierarchies easier.
Probably best to restrict to super-/sub-traits. E.g.,
trait Foo {
fn foo(&self) -> usize;
}
trait Bar: Foo {
fn bar1(&mut self) -> String;
fn bar2(&self) -> Foo;
}
impl Foo + Bar for SomeConcreteType {
fn foo(&self) -> usize{
...
}
fn bar1(&mut self) -> String{
...
}
fn bar2(&self) -> Foo {
...
}
}
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
Review issue #1281 and its trait-hierarchy example first; compare the proposed impl Foo + Bar for SomeConcreteType syntax with the stated super-/sub-trait restriction. Done means the RFC has a settled, implementable specification for multiple-trait impls, including the accepted syntax and scope.
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
- 30/100