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Handle mismatched generic param kinds in trait impls betterly#96717

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BoxyUwU:gats_const_param_types_mismatch_err
May 10, 2022
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Handle mismatched generic param kinds in trait impls betterly#96717
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BoxyUwU:gats_const_param_types_mismatch_err

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@BoxyUwU BoxyUwU commented May 4, 2022 •
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  • Check that generic params on a generic associated type are the same as in the trait definition
  • Check that const generics are not used in place of type generics (and the other way round too)

r? @lcnr

@rustbot rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label May 4, 2022
@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label May 4, 2022
@BoxyUwU BoxyUwU added the A-const-generics Area: const generics (parameters and arguments) label May 4, 2022
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lcnr commented May 5, 2022

@bors r+ rollup

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bors commented May 5, 2022

📌 Commit 52916657e53bfd5f91190953708120a5be5b2641 has been approved by lcnr

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 5, 2022
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BoxyUwU commented May 5, 2022

@bors r-

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels May 5, 2022
@BoxyUwU BoxyUwU force-pushed the gats_const_param_types_mismatch_err branch from 5291665 to e64b4d1 Compare May 5, 2022 12:02
@BoxyUwU BoxyUwU changed the title Check const param tys in gats in trait impls Handle mismatched generic param kinds in trait impls betterly May 5, 2022
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can you add a test for the following? after that r=me

trait Trait {
    fn func<U, const N: usize>() {}
}
impl Trait for () {
    fn func<const N: usize, U>() {}
}

@BoxyUwU BoxyUwU force-pushed the gats_const_param_types_mismatch_err branch from 7ee1b25 to 0cf7604 Compare May 5, 2022 14:17
@BoxyUwU BoxyUwU force-pushed the gats_const_param_types_mismatch_err branch from 0cf7604 to fea1d76 Compare May 5, 2022 16:51
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2 more nits, then r=me

compiler/rustc_typeck/src/check/compare_method.rs Outdated
} {
let make_param_message = |prefix: &str, param: &ty::GenericParamDef| match param.kind {
Const { .. } => {
format!("{} const parameter with type `{}`", prefix, tcx.type_of(param.def_id))
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Suggested change
format!("{} const parameter with type `{}`", prefix, tcx.type_of(param.def_id))
format!("{} const parameter of type `{}`", prefix, tcx.type_of(param.def_id))

For me "of type" seems more natural here, idk 😅

Considering that this closure doesn't capture anything, can you move it out of the loop to ty_const_params_of?

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Changed the error wording.

I don't think it'd be good to have the closure be by ty_const_params_of since then its really far away from the code actually calling the closure. I pushed code moving it furthur down so its closer to the call site, imo makes it easier to understand the code.

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lcnr commented May 10, 2022

@bors r+ rollup

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bors commented May 10, 2022

📌 Commit e4b8ed5 has been approved by lcnr

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels May 10, 2022
@JohnTitor JohnTitor mentioned this pull request May 10, 2022
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bors added a commit to rust-lang-ci/rust that referenced this pull request May 10, 2022
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Auto merge of rust-lang#96904 - JohnTitor:rollup-f1sz5x0, r=JohnTitor
d4c3643 
Rollup of 6 pull requests

Successful merges:

 - rust-lang#96717 (Handle mismatched generic param kinds in trait impls betterly)
 - rust-lang#96725 (Expose process windows_process_extensions_main_thread_handle on Windows)
 - rust-lang#96849 (Move some tests to more reasonable places)
 - rust-lang#96861 (Use Rust 2021 prelude in std itself.)
 - rust-lang#96879 (rustdoc: search result ranking fix)
 - rust-lang#96882 (Don't subst an AdtDef with its own substs)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 77030b7 into rust-lang:master May 10, 2022
@rustbot rustbot added this to the 1.62.0 milestone May 10, 2022
@BoxyUwU BoxyUwU mentioned this pull request Jun 1, 2022
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A-const-generics Area: const generics (parameters and arguments) S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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