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Rollup merge of #137831 - estebank:auto-trait-err, r=compiler-errors

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Tweak auto trait errors

Make suggestions to remove params and super traits verbose and make spans more accurate.

```
error[E0567]: auto traits cannot have generic parameters
  --> $DIR/auto-trait-validation.rs:6:19
   |
LL | auto trait Generic<T> {}
   |            -------^^^
   |            |
   |            auto trait cannot have generic parameters

error[E0568]: auto traits cannot have super traits or lifetime bounds
  --> $DIR/auto-trait-validation.rs:8:20
   |
LL | auto trait Bound : Copy {}
   |            -----   ^^^^
   |            |
   |            auto traits cannot have super traits or lifetime bounds
```

```
error[E0380]: auto traits cannot have associated items
  --> $DIR/issue-23080.rs:5:8
   |
LL | unsafe auto trait Trait {
   |                   ----- auto traits cannot have associated items
LL |     fn method(&self) {
   |        ^^^^^^
```
This commit is contained in:
Stuart Cook
2025-08-07 20:49:36 +10:00
committed by GitHub
parent 61cb1e97fc 91e606b715
commit bcd50fd45f
19 changed files with 118 additions and 43 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
compiler/rustc_ast_passes/messages.ftl
View File

@@ -40,7 +40,7 @@ ast_passes_auto_generic = auto traits cannot have generic parameters
ast_passes_auto_items = auto traits cannot have associated items
.label = {ast_passes_auto_items}
.suggestion = remove these associated items
.suggestion = remove the associated items
ast_passes_auto_super_lifetime = auto traits cannot have super traits or lifetime bounds
.label = {ast_passes_auto_super_lifetime}

16
compiler/rustc_ast_passes/src/ast_validation.rs
View File

@@ -699,19 +699,23 @@ impl<'a> AstValidator<'a> {
}
}
fn deny_super_traits(&self, bounds: &GenericBounds, ident_span: Span) {
fn deny_super_traits(&self, bounds: &GenericBounds, ident: Span) {
if let [.., last] = &bounds[..] {
let span = ident_span.shrink_to_hi().to(last.span());
self.dcx().emit_err(errors::AutoTraitBounds { span, ident: ident_span });
let span = bounds.iter().map(|b| b.span()).collect();
let removal = ident.shrink_to_hi().to(last.span());
self.dcx().emit_err(errors::AutoTraitBounds { span, removal, ident });
}
}
fn deny_where_clause(&self, where_clause: &WhereClause, ident_span: Span) {
fn deny_where_clause(&self, where_clause: &WhereClause, ident: Span) {
if !where_clause.predicates.is_empty() {
// FIXME: The current diagnostic is misleading since it only talks about
// super trait and lifetime bounds while we should just say “bounds”.
self.dcx()
.emit_err(errors::AutoTraitBounds { span: where_clause.span, ident: ident_span });
self.dcx().emit_err(errors::AutoTraitBounds {
span: vec![where_clause.span],
removal: where_clause.span,
ident,
});
}
}

9
compiler/rustc_ast_passes/src/errors.rs
View File

@@ -344,7 +344,7 @@ pub(crate) struct ModuleNonAscii {
#[diag(ast_passes_auto_generic, code = E0567)]
pub(crate) struct AutoTraitGeneric {
#[primary_span]
#[suggestion(code = "", applicability = "machine-applicable")]
#[suggestion(code = "", applicability = "machine-applicable", style = "tool-only")]
pub span: Span,
#[label]
pub ident: Span,
@@ -354,8 +354,9 @@ pub(crate) struct AutoTraitGeneric {
#[diag(ast_passes_auto_super_lifetime, code = E0568)]
pub(crate) struct AutoTraitBounds {
#[primary_span]
#[suggestion(code = "", applicability = "machine-applicable")]
pub span: Span,
pub span: Vec<Span>,
#[suggestion(code = "", applicability = "machine-applicable", style = "tool-only")]
pub removal: Span,
#[label]
pub ident: Span,
}
@@ -365,7 +366,7 @@ pub(crate) struct AutoTraitBounds {
pub(crate) struct AutoTraitItems {
#[primary_span]
pub spans: Vec<Span>,
#[suggestion(code = "", applicability = "machine-applicable")]
#[suggestion(code = "", applicability = "machine-applicable", style = "tool-only")]
pub total: Span,
#[label]
pub ident: Span,

2
tests/ui/auto-traits/assoc-ty.current.stderr
View File

@@ -5,7 +5,7 @@ LL | auto trait Trait {
| ----- auto traits cannot have associated items
LL |
LL | type Output;
| -----^^^^^^- help: remove these associated items
| ^^^^^^
error[E0658]: auto traits are experimental and possibly buggy
--> $DIR/assoc-ty.rs:8:1

2
tests/ui/auto-traits/assoc-ty.next.stderr
View File

@@ -5,7 +5,7 @@ LL | auto trait Trait {
| ----- auto traits cannot have associated items
LL |
LL | type Output;
| -----^^^^^^- help: remove these associated items
| ^^^^^^
error[E0658]: auto traits are experimental and possibly buggy
--> $DIR/assoc-ty.rs:8:1

11
tests/ui/auto-traits/auto-trait-validation.fixed
View File

@@ -11,4 +11,15 @@ auto trait LifetimeBound {}
//~^ ERROR auto traits cannot have super traits or lifetime bounds [E0568]
auto trait MyTrait { }
//~^ ERROR auto traits cannot have associated items [E0380]
auto trait AssocTy { }
//~^ ERROR auto traits cannot have associated items [E0380]
auto trait All {
//~^ ERROR auto traits cannot have generic parameters [E0567]
}
// We can't test both generic params and super-traits because the suggestion span overlaps.
auto trait All2 {
//~^ ERROR auto traits cannot have super traits or lifetime bounds [E0568]
}
fn main() {}

15
tests/ui/auto-traits/auto-trait-validation.rs
View File

@@ -11,4 +11,19 @@ auto trait LifetimeBound : 'static {}
//~^ ERROR auto traits cannot have super traits or lifetime bounds [E0568]
auto trait MyTrait { fn foo() {} }
//~^ ERROR auto traits cannot have associated items [E0380]
auto trait AssocTy { type Bar; }
//~^ ERROR auto traits cannot have associated items [E0380]
auto trait All<'a, T> {
//~^ ERROR auto traits cannot have generic parameters [E0567]
type Bar;
//~^ ERROR auto traits cannot have associated items [E0380]
fn foo() {}
}
// We can't test both generic params and super-traits because the suggestion span overlaps.
auto trait All2: Copy + 'static {
//~^ ERROR auto traits cannot have super traits or lifetime bounds [E0568]
type Bar;
//~^ ERROR auto traits cannot have associated items [E0380]
fn foo() {}
}
fn main() {}

65
tests/ui/auto-traits/auto-trait-validation.stderr
View File

@@ -2,23 +2,23 @@ error[E0567]: auto traits cannot have generic parameters
--> $DIR/auto-trait-validation.rs:6:19
|
LL | auto trait Generic<T> {}
| -------^^^ help: remove the parameters
| -------^^^
| |
| auto trait cannot have generic parameters
error[E0568]: auto traits cannot have super traits or lifetime bounds
--> $DIR/auto-trait-validation.rs:8:17
--> $DIR/auto-trait-validation.rs:8:20
|
LL | auto trait Bound : Copy {}
| -----^^^^^^^ help: remove the super traits or lifetime bounds
| ----- ^^^^
| |
| auto traits cannot have super traits or lifetime bounds
error[E0568]: auto traits cannot have super traits or lifetime bounds
--> $DIR/auto-trait-validation.rs:10:25
--> $DIR/auto-trait-validation.rs:10:28
|
LL | auto trait LifetimeBound : 'static {}
| -------------^^^^^^^^^^ help: remove the super traits or lifetime bounds
| ------------- ^^^^^^^
| |
| auto traits cannot have super traits or lifetime bounds
@@ -26,12 +26,59 @@ error[E0380]: auto traits cannot have associated items
--> $DIR/auto-trait-validation.rs:12:25
|
LL | auto trait MyTrait { fn foo() {} }
| ------- ---^^^-----
| | |
| | help: remove these associated items
| ------- ^^^
| |
| auto traits cannot have associated items
error: aborting due to 4 previous errors
error[E0380]: auto traits cannot have associated items
--> $DIR/auto-trait-validation.rs:14:27
|
LL | auto trait AssocTy { type Bar; }
| ------- ^^^
| |
| auto traits cannot have associated items
error[E0567]: auto traits cannot have generic parameters
--> $DIR/auto-trait-validation.rs:16:15
|
LL | auto trait All<'a, T> {
| ---^^^^^^^
| |
| auto trait cannot have generic parameters
error[E0380]: auto traits cannot have associated items
--> $DIR/auto-trait-validation.rs:18:10
|
LL | auto trait All<'a, T> {
| --- auto traits cannot have associated items
LL |
LL | type Bar;
| ^^^
LL |
LL | fn foo() {}
| ^^^
error[E0568]: auto traits cannot have super traits or lifetime bounds
--> $DIR/auto-trait-validation.rs:23:18
|
LL | auto trait All2: Copy + 'static {
| ---- ^^^^ ^^^^^^^
| |
| auto traits cannot have super traits or lifetime bounds
error[E0380]: auto traits cannot have associated items
--> $DIR/auto-trait-validation.rs:25:10
|
LL | auto trait All2: Copy + 'static {
| ---- auto traits cannot have associated items
LL |
LL | type Bar;
| ^^^
LL |
LL | fn foo() {}
| ^^^
error: aborting due to 9 previous errors
Some errors have detailed explanations: E0380, E0567, E0568.
For more information about an error, try `rustc --explain E0380`.

2
tests/ui/auto-traits/bad-generics-on-dyn.stderr
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@@ -2,7 +2,7 @@ error[E0567]: auto traits cannot have generic parameters
--> $DIR/bad-generics-on-dyn.rs:3:18
|
LL | auto trait Trait1<'a> {}
| ------^^^^ help: remove the parameters
| ------^^^^
| |
| auto trait cannot have generic parameters

2
tests/ui/auto-traits/has-arguments.stderr
View File

@@ -2,7 +2,7 @@ error[E0567]: auto traits cannot have generic parameters
--> $DIR/has-arguments.rs:3:18
|
LL | auto trait Trait1<'outer> {}
| ------^^^^^^^^ help: remove the parameters
| ------^^^^^^^^
| |
| auto trait cannot have generic parameters

2
tests/ui/auto-traits/issue-117789.stderr
View File

@@ -2,7 +2,7 @@ error[E0567]: auto traits cannot have generic parameters
--> $DIR/issue-117789.rs:1:17
|
LL | auto trait Trait<P> {}
| -----^^^ help: remove the parameters
| -----^^^
| |
| auto trait cannot have generic parameters

2
tests/ui/auto-traits/issue-23080-2.current.stderr
View File

@@ -4,7 +4,7 @@ error[E0380]: auto traits cannot have associated items
LL | unsafe auto trait Trait {
| ----- auto traits cannot have associated items
LL | type Output;
| -----^^^^^^- help: remove these associated items
| ^^^^^^
error: aborting due to 1 previous error

2
tests/ui/auto-traits/issue-23080-2.next.stderr
View File

@@ -4,7 +4,7 @@ error[E0380]: auto traits cannot have associated items
LL | unsafe auto trait Trait {
| ----- auto traits cannot have associated items
LL | type Output;
| -----^^^^^^- help: remove these associated items
| ^^^^^^
error: aborting due to 1 previous error

11
tests/ui/auto-traits/issue-23080.stderr
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@@ -1,13 +1,10 @@
error[E0380]: auto traits cannot have associated items
--> $DIR/issue-23080.rs:5:8
|
LL | unsafe auto trait Trait {
| ----- auto traits cannot have associated items
LL | fn method(&self) {
| _____- ^^^^^^
LL | | println!("Hello");
LL | | }
| |_____- help: remove these associated items
LL | unsafe auto trait Trait {
| ----- auto traits cannot have associated items
LL | fn method(&self) {
| ^^^^^^
error: aborting due to 1 previous error

2
tests/ui/auto-traits/issue-84075.stderr
View File

@@ -2,7 +2,7 @@ error[E0568]: auto traits cannot have super traits or lifetime bounds
--> $DIR/issue-84075.rs:5:18
|
LL | auto trait Magic where Self: Copy {}
| ----- ^^^^^^^^^^^^^^^^ help: remove the super traits or lifetime bounds
| ----- ^^^^^^^^^^^^^^^^
| |
| auto traits cannot have super traits or lifetime bounds

6
tests/ui/auto-traits/typeck-auto-trait-no-supertraits-2.stderr
View File

@@ -1,8 +1,8 @@
error[E0568]: auto traits cannot have super traits or lifetime bounds
--> $DIR/typeck-auto-trait-no-supertraits-2.rs:4:17
--> $DIR/typeck-auto-trait-no-supertraits-2.rs:4:20
|
LL | auto trait Magic : Sized where Option<Self> : Magic {}
| -----^^^^^^^^ help: remove the super traits or lifetime bounds
| ----- ^^^^^
| |
| auto traits cannot have super traits or lifetime bounds
@@ -10,7 +10,7 @@ error[E0568]: auto traits cannot have super traits or lifetime bounds
--> $DIR/typeck-auto-trait-no-supertraits-2.rs:4:26
|
LL | auto trait Magic : Sized where Option<Self> : Magic {}
| ----- ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the super traits or lifetime bounds
| ----- ^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| auto traits cannot have super traits or lifetime bounds

4
tests/ui/auto-traits/typeck-auto-trait-no-supertraits.stderr
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@@ -1,8 +1,8 @@
error[E0568]: auto traits cannot have super traits or lifetime bounds
--> $DIR/typeck-auto-trait-no-supertraits.rs:28:17
--> $DIR/typeck-auto-trait-no-supertraits.rs:28:19
|
LL | auto trait Magic: Copy {}
| -----^^^^^^ help: remove the super traits or lifetime bounds
| ----- ^^^^
| |
| auto traits cannot have super traits or lifetime bounds

2
tests/ui/methods/issues/issue-105732.stderr
View File

@@ -4,7 +4,7 @@ error[E0380]: auto traits cannot have associated items
LL | auto trait Foo {
| --- auto traits cannot have associated items
LL | fn g(&self);
| ---^-------- help: remove these associated items
| ^
error[E0599]: no method named `g` found for reference `&Self` in the current scope
--> $DIR/issue-105732.rs:10:14

4
tests/ui/traits/inductive-overflow/supertrait-auto-trait.stderr
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@@ -1,8 +1,8 @@
error[E0568]: auto traits cannot have super traits or lifetime bounds
--> $DIR/supertrait-auto-trait.rs:8:17
--> $DIR/supertrait-auto-trait.rs:8:19
|
LL | auto trait Magic: Copy {}
| -----^^^^^^ help: remove the super traits or lifetime bounds
| ----- ^^^^
| |
| auto traits cannot have super traits or lifetime bounds