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Recover upon mistyped error on typo'd const in const param def #112029

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Merged
merged 1 commit into from
May 29, 2023
Merged

Recover upon mistyped error on typo'd const in const param def #112029

merged 1 commit into from
May 29, 2023

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jieyouxu
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And add machine-applicable fix for the typo'd const keyword.

Before

error: expected one of `,`, `:`, `=`, or `>`, found `N`
 --> src/lib.rs:1:18
  |
1 | pub fn bar<Const N: u8>() {}
  |                  ^ expected one of `,`, `:`, `=`, or `>`

After This PR

error: `const` keyword was mistyped as `Const`
 --> test.rs:1:8
  |
1 | fn bar<Const N: u8>() {}
  |        ^^^^^
  |
help: use the `const` keyword
  |
1 | fn bar<const N: u8>() {}
  |        ~~~~~

Fixes #111941.

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rustbot commented May 28, 2023

r? @cjgillot

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@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels May 28, 2023
@jieyouxu jieyouxu force-pushed the typo-const-in-const-param-def branch from 84a5120 to be66fca Compare May 28, 2023 06:36
cjgillot
cjgillot reviewed May 28, 2023
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compiler/rustc_parse/src/parser/generics.rs Outdated
Comment on lines 239 to 258
if let Some(last) = params.last()
&& last.ident.as_str().to_ascii_lowercase() == kw::Const.as_str()
{
// We might have a typo'd `Const` that was parsed as a type parameter.
let span = last.ident.span;
let mut err = self.struct_span_err(
span,
format!("`const` keyword was mistyped as `{}`", last.ident.as_str()),
);
err.span_suggestion_verbose(
span,
"use the `const` keyword",
kw::Const.as_str(),
Applicability::MachineApplicable,
);
err.emit();
return Err(err);
} else {
self.expect_gt()?;
}
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Should this suggestion happen inside parse_generic_params or parse_ty_param?
Can it be made an actual recovery = if self.may_recover(), find a way to return Ok with a sensible AST?

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I think I got the recovery as GenericParam working

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Had to attrs.clone() a few places, not sure if I can avoid it

@jieyouxu jieyouxu force-pushed the typo-const-in-const-param-def branch from 302052c to e98650c Compare May 28, 2023 07:59
@jieyouxu jieyouxu changed the title Show mistyped error on typo'd const in const param def Recover upon mistyped error on typo'd const in const param def May 28, 2023
cjgillot
cjgillot reviewed May 28, 2023
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@jieyouxu jieyouxu force-pushed the typo-const-in-const-param-def branch from e98650c to 41f5a30 Compare May 28, 2023 08:55
@cjgillot
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Thanks!
@bors r+

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bors commented May 28, 2023

📌 Commit 41f5a30 has been approved by cjgillot

It is now in the queue for this repository.

@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 28, 2023
@matthiaskrgr matthiaskrgr mentioned this pull request May 29, 2023
Merged
bors added a commit to rust-lang-ci/rust that referenced this pull request May 29, 2023
@bors
Auto merge of rust-lang#112055 - matthiaskrgr:rollup-y3exx8c, r=matth…
dc0943d 
…iaskrgr

Rollup of 5 pull requests

Successful merges:

 - rust-lang#112029 (Recover upon mistyped error on typo'd `const` in const param def)
 - rust-lang#112037 (Add details about `unsafe_op_in_unsafe_fn` to E0133)
 - rust-lang#112039 (compiler: update solaris/illumos to enable tsan support.)
 - rust-lang#112042 (Migrate GUI colors test to original CSS color format)
 - rust-lang#112045 (Followup to rust-lang#111973)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 45ca2f7 into rust-lang:master May 29, 2023
@rustbot rustbot added this to the 1.72.0 milestone May 29, 2023
@jieyouxu jieyouxu deleted the typo-const-in-const-param-def branch December 20, 2024 17:37
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missing recover for typo'd const in const parameter definition
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