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Rollup merge of #97812 - TaKO8Ki:suggest-to-swap-struct-and-trait, r=estebank

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Suggest to swap a struct and a trait in trait impls

closes #89590
This commit is contained in:
Dylan DPC 2022-06-11 07:42:14 +02:00 committed by GitHub
commit 640019ba6e
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GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 185 additions and 2 deletions
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9
compiler/rustc_resolve/src/late.rs
View File

@ -513,6 +513,9 @@ struct DiagnosticMetadata<'ast> {
/// The current impl items (used to suggest).
current_impl_items: Option<&'ast [P<AssocItem>]>,
/// When processing impl trait
currently_processing_impl_trait: Option<(TraitRef, Ty)>,
}
struct LateResolutionVisitor<'a, 'b, 'ast> {
@ -2087,18 +2090,22 @@ fn with_trait_items<T>(
fn with_optional_trait_ref<T>(
&mut self,
opt_trait_ref: Option<&TraitRef>,
self_type: &'ast Ty,
f: impl FnOnce(&mut Self, Option<DefId>) -> T,
) -> T {
let mut new_val = None;
let mut new_id = None;
if let Some(trait_ref) = opt_trait_ref {
let path: Vec<_> = Segment::from_path(&trait_ref.path);
self.diagnostic_metadata.currently_processing_impl_trait =
Some((trait_ref.clone(), self_type.clone()));
let res = self.smart_resolve_path_fragment(
None,
&path,
PathSource::Trait(AliasPossibility::No),
Finalize::new(trait_ref.ref_id, trait_ref.path.span),
);
self.diagnostic_metadata.currently_processing_impl_trait = None;
if let Some(def_id) = res.base_res().opt_def_id() {
new_id = Some(def_id);
new_val = Some((self.r.expect_module(def_id), trait_ref.clone()));
@ -2139,7 +2146,7 @@ fn resolve_implementation(
this.with_self_rib(Res::SelfTy { trait_: None, alias_to: None }, |this| {
this.with_lifetime_rib(LifetimeRibKind::AnonymousCreateParameter(item_id), |this| {
// Resolve the trait reference, if necessary.
this.with_optional_trait_ref(opt_trait_reference.as_ref(), |this, trait_id| {
this.with_optional_trait_ref(opt_trait_reference.as_ref(), self_type, |this, trait_id| {
let item_def_id = this.r.local_def_id(item_id);
// Register the trait definitions from here.

33
compiler/rustc_resolve/src/late/diagnostics.rs
View File

@ -146,6 +146,8 @@ pub(crate) fn smart_resolve_report_errors(
let is_expected = &|res| source.is_expected(res);
let is_enum_variant = &|res| matches!(res, Res::Def(DefKind::Variant, _));
debug!(?res, ?source);
// Make the base error.
struct BaseError<'a> {
msg: String,
@ -250,6 +252,8 @@ struct BaseError<'a> {
let mut err =
self.r.session.struct_span_err_with_code(base_error.span, &base_error.msg, code);
self.suggest_swapping_misplaced_self_ty_and_trait(&mut err, source, res, base_error.span);
if let Some(sugg) = base_error.suggestion {
err.span_suggestion_verbose(sugg.0, sugg.1, sugg.2, Applicability::MaybeIncorrect);
}
@ -692,6 +696,35 @@ fn detect_assoct_type_constraint_meant_as_path(&self, base_span: Span, err: &mut
}
}
fn suggest_swapping_misplaced_self_ty_and_trait(
&mut self,
err: &mut Diagnostic,
source: PathSource<'_>,
res: Option<Res>,
span: Span,
) {
if let Some((trait_ref, self_ty)) =
self.diagnostic_metadata.currently_processing_impl_trait.clone()
&& let TyKind::Path(_, self_ty_path) = &self_ty.kind
&& let PathResult::Module(ModuleOrUniformRoot::Module(module)) =
self.resolve_path(&Segment::from_path(self_ty_path), Some(TypeNS), None)
&& let ModuleKind::Def(DefKind::Trait, ..) = module.kind
&& trait_ref.path.span == span
&& let PathSource::Trait(_) = source
&& let Some(Res::Def(DefKind::Struct | DefKind::Enum | DefKind::Union, _)) = res
&& let Ok(self_ty_str) =
self.r.session.source_map().span_to_snippet(self_ty.span)
&& let Ok(trait_ref_str) =
self.r.session.source_map().span_to_snippet(trait_ref.path.span)
{
err.multipart_suggestion(
"`impl` items mention the trait being implemented first and the type it is being implemented for second",
vec![(trait_ref.path.span, self_ty_str), (self_ty.span, trait_ref_str)],
Applicability::MaybeIncorrect,
);
}
}
fn get_single_associated_item(
&mut self,
path: &[Segment],

2
compiler/rustc_span/src/lib.rs
View File

@ -333,7 +333,7 @@ impl<'a> FileNameDisplay<'a> {
pub fn to_string_lossy(&self) -> Cow<'a, str> {
match self.inner {
FileName::Real(ref inner) => inner.to_string_lossy(self.display_pref),
_ => Cow::from(format!("{}", self)),
_ => Cow::from(self.to_string()),
}
}
}

22
src/test/ui/suggestions/suggest-swapping-self-ty-and-trait-edition-2021.rs Normal file
View File

@ -0,0 +1,22 @@
// edition:2021
pub trait Trait<'a, T> {}
pub struct Struct<T>;
pub enum Enum<T> {}
pub union Union<T> {
f1: usize,
}
impl<'a, T> Struct<T> for Trait<'a, T> {}
//~^ ERROR expected trait, found struct `Struct`
//~| ERROR trait objects must include the `dyn` keyword
impl<'a, T> Enum<T> for Trait<'a, T> {}
//~^ ERROR expected trait, found enum `Enum`
impl<'a, T> Union<T> for Trait<'a, T> {}
//~^ ERROR expected trait, found union `Union`
fn main() {}

49
src/test/ui/suggestions/suggest-swapping-self-ty-and-trait-edition-2021.stderr Normal file
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@ -0,0 +1,49 @@
error[E0404]: expected trait, found struct `Struct`
--> $DIR/suggest-swapping-self-ty-and-trait-edition-2021.rs:12:13
|
LL | impl<'a, T> Struct<T> for Trait<'a, T> {}
| ^^^^^^^^^ not a trait
|
help: `impl` items mention the trait being implemented first and the type it is being implemented for second
|
LL | impl<'a, T> Trait<'a, T> for Struct<T> {}
| ~~~~~~~~~~~~ ~~~~~~~~~
error[E0404]: expected trait, found enum `Enum`
--> $DIR/suggest-swapping-self-ty-and-trait-edition-2021.rs:16:13
|
LL | impl<'a, T> Enum<T> for Trait<'a, T> {}
| ^^^^^^^ not a trait
|
help: `impl` items mention the trait being implemented first and the type it is being implemented for second
|
LL | impl<'a, T> Trait<'a, T> for Enum<T> {}
| ~~~~~~~~~~~~ ~~~~~~~
error[E0404]: expected trait, found union `Union`
--> $DIR/suggest-swapping-self-ty-and-trait-edition-2021.rs:19:13
|
LL | impl<'a, T> Union<T> for Trait<'a, T> {}
| ^^^^^^^^ not a trait
|
help: `impl` items mention the trait being implemented first and the type it is being implemented for second
|
LL | impl<'a, T> Trait<'a, T> for Union<T> {}
| ~~~~~~~~~~~~ ~~~~~~~~
error[E0782]: trait objects must include the `dyn` keyword
--> $DIR/suggest-swapping-self-ty-and-trait-edition-2021.rs:12:27
|
LL | impl<'a, T> Struct<T> for Trait<'a, T> {}
| ^^^^^^^^^^^^
|
help: add `dyn` keyword before this trait
|
LL - impl<'a, T> Struct<T> for Trait<'a, T> {}
LL + impl<'a, T> Struct<T> for dyn Trait<'a, T> {}
|
error: aborting due to 4 previous errors
Some errors have detailed explanations: E0404, E0782.
For more information about an error, try `rustc --explain E0404`.

21
src/test/ui/suggestions/suggest-swapping-self-ty-and-trait.rs Normal file
View File

@ -0,0 +1,21 @@
pub trait Trait<'a, T> {}
pub struct Struct<T>;
pub enum Enum<T> {}
pub union Union<T> {
f1: usize,
}
impl<'a, T> Struct<T> for Trait<'a, T> {}
//~^ ERROR expected trait, found struct `Struct`
//~| WARNING trait objects without an explicit `dyn` are deprecated
//~| WARNING this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
impl<'a, T> Enum<T> for Trait<'a, T> {}
//~^ ERROR expected trait, found enum `Enum`
impl<'a, T> Union<T> for Trait<'a, T> {}
//~^ ERROR expected trait, found union `Union`
fn main() {}

51
src/test/ui/suggestions/suggest-swapping-self-ty-and-trait.stderr Normal file
View File

@ -0,0 +1,51 @@
error[E0404]: expected trait, found struct `Struct`
--> $DIR/suggest-swapping-self-ty-and-trait.rs:10:13
|
LL | impl<'a, T> Struct<T> for Trait<'a, T> {}
| ^^^^^^^^^ not a trait
|
help: `impl` items mention the trait being implemented first and the type it is being implemented for second
|
LL | impl<'a, T> Trait<'a, T> for Struct<T> {}
| ~~~~~~~~~~~~ ~~~~~~~~~
error[E0404]: expected trait, found enum `Enum`
--> $DIR/suggest-swapping-self-ty-and-trait.rs:15:13
|
LL | impl<'a, T> Enum<T> for Trait<'a, T> {}
| ^^^^^^^ not a trait
|
help: `impl` items mention the trait being implemented first and the type it is being implemented for second
|
LL | impl<'a, T> Trait<'a, T> for Enum<T> {}
| ~~~~~~~~~~~~ ~~~~~~~
error[E0404]: expected trait, found union `Union`
--> $DIR/suggest-swapping-self-ty-and-trait.rs:18:13
|
LL | impl<'a, T> Union<T> for Trait<'a, T> {}
| ^^^^^^^^ not a trait
|
help: `impl` items mention the trait being implemented first and the type it is being implemented for second
|
LL | impl<'a, T> Trait<'a, T> for Union<T> {}
| ~~~~~~~~~~~~ ~~~~~~~~
warning: trait objects without an explicit `dyn` are deprecated
--> $DIR/suggest-swapping-self-ty-and-trait.rs:10:27
|
LL | impl<'a, T> Struct<T> for Trait<'a, T> {}
| ^^^^^^^^^^^^
|
= note: `#[warn(bare_trait_objects)]` on by default
= warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
= note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
help: use `dyn`
|
LL - impl<'a, T> Struct<T> for Trait<'a, T> {}
LL + impl<'a, T> Struct<T> for dyn Trait<'a, T> {}
|
error: aborting due to 3 previous errors; 1 warning emitted
For more information about this error, try `rustc --explain E0404`.