Closed compiler-errors closed 1 year ago
This issue is not meant to be used for technical discussion. There is a Zulip stream for that. Use this issue to leave procedural comments, such as volunteering to review, indicating that you second the proposal (or third, etc), or raising a concern that you would like to be addressed.
cc @rust-lang/types
@rustbot second
The actual PR for this will likely need lang okay, but from a types perspective, I think it's a good feature to experiment with.
Cool, noted
Would this addition resolve https://github.com/rust-lang/rfcs/issues/1481 ?
@zyansheep, yes
closing as accepted
Proposal
Modify the resolver and type system to support
for<T>
in where clauses and associated item bounds (not object types or return-position impl traits).Why?
where for<T> Self::Assoc<T>: Trait
).ty::Bound
andty::Placeholder
a bit more, even if currently they're pretty useless on their own (i.e. without implication predicates).where for<T: Debug> Self::Assoc<T>: Debug
).Side-note: If anyone thinks this should be a compiler MCP, I'd be happy to move this over there. If this is better suited for a T-lang initiative, or needs a pre-RFC, then let me know.
Mentors or Reviewers
I've got a branch that mostly implements support for this, but it needs major cleaning up. I'm willing to do that work, but I just don't want to invest too much time to clean it up unless there's reasonable interest in support for type binders from other team members. https://github.com/rust-lang/rust/compare/master...compiler-errors:rust:non_lifetime_binders
Process
The main points of the Major Change Process are as follows:
@rustbot second
.-C flag
, then full team check-off is required.@rfcbot fcp merge
on either the MCP or the PR.You can read more about Major Change Proposals on forge.
Comments
This issue is not meant to be used for technical discussion. There is a Zulip stream for that. Use this issue to leave procedural comments, such as volunteering to review, indicating that you second the proposal (or third, etc), or raising a concern that you would like to be addressed.