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Account for type param from other item in note_and_explain

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Fix #89868.
This commit is contained in:
Esteban Küber 2023-10-26 19:56:46 +00:00
parent 3bbc70a5f7
commit 7449478c2f
4 changed files with 175 additions and 43 deletions
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104
compiler/rustc_infer/src/infer/error_reporting/note_and_explain.rs
View File

@ -54,13 +54,17 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
}
(ty::Param(expected), ty::Param(found)) => {
let generics = tcx.generics_of(body_owner_def_id);
let e_span = tcx.def_span(generics.type_param(expected, tcx).def_id);
if !sp.contains(e_span) {
diag.span_label(e_span, "expected type parameter");
if let Some(param) = generics.opt_type_param(expected, tcx) {
let e_span = tcx.def_span(param.def_id);
if !sp.contains(e_span) {
diag.span_label(e_span, "expected type parameter");
}
}
let f_span = tcx.def_span(generics.type_param(found, tcx).def_id);
if !sp.contains(f_span) {
diag.span_label(f_span, "found type parameter");
if let Some(param) = generics.opt_type_param(found, tcx) {
let f_span = tcx.def_span(param.def_id);
if !sp.contains(f_span) {
diag.span_label(f_span, "found type parameter");
}
}
diag.note(
"a type parameter was expected, but a different one was found; \
@ -83,23 +87,29 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
| (ty::Alias(ty::Projection, proj), ty::Param(p))
if !tcx.is_impl_trait_in_trait(proj.def_id) =>
{
let p_def_id = tcx.generics_of(body_owner_def_id).type_param(p, tcx).def_id;
let p_span = tcx.def_span(p_def_id);
let expected = match (values.expected.kind(), values.found.kind()) {
(ty::Param(_), _) => "expected ",
(_, ty::Param(_)) => "found ",
_ => "",
};
if !sp.contains(p_span) {
diag.span_label(p_span, format!("{expected}this type parameter"));
}
let hir = tcx.hir();
let parent = tcx.generics_of(body_owner_def_id)
.opt_type_param(p, tcx)
.and_then(|param| {
let p_def_id = param.def_id;
let p_span = tcx.def_span(p_def_id);
let expected = match (values.expected.kind(), values.found.kind()) {
(ty::Param(_), _) => "expected ",
(_, ty::Param(_)) => "found ",
_ => "",
};
if !sp.contains(p_span) {
diag.span_label(
p_span,
format!("{expected}this type parameter"),
);
}
p_def_id.as_local().and_then(|id| {
let local_id = tcx.hir().local_def_id_to_hir_id(id);
let generics = tcx.hir().find_parent(local_id)?.generics()?;
Some((id, generics))
})
});
let mut note = true;
let parent = p_def_id.as_local().and_then(|id| {
let local_id = hir.local_def_id_to_hir_id(id);
let generics = tcx.hir().find_parent(local_id)?.generics()?;
Some((id, generics))
});
if let Some((local_id, generics)) = parent {
// Synthesize the associated type restriction `Add<Output = Expected>`.
// FIXME: extract this logic for use in other diagnostics.
@ -172,14 +182,16 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
(ty::Param(p), ty::Dynamic(..) | ty::Alias(ty::Opaque, ..))
| (ty::Dynamic(..) | ty::Alias(ty::Opaque, ..), ty::Param(p)) => {
let generics = tcx.generics_of(body_owner_def_id);
let p_span = tcx.def_span(generics.type_param(p, tcx).def_id);
let expected = match (values.expected.kind(), values.found.kind()) {
(ty::Param(_), _) => "expected ",
(_, ty::Param(_)) => "found ",
_ => "",
};
if !sp.contains(p_span) {
diag.span_label(p_span, format!("{expected}this type parameter"));
if let Some(param) = generics.opt_type_param(p, tcx) {
let p_span = tcx.def_span(param.def_id);
let expected = match (values.expected.kind(), values.found.kind()) {
(ty::Param(_), _) => "expected ",
(_, ty::Param(_)) => "found ",
_ => "",
};
if !sp.contains(p_span) {
diag.span_label(p_span, format!("{expected}this type parameter"));
}
}
diag.help("type parameters must be constrained to match other types");
if tcx.sess.teach(&diag.get_code().unwrap()) {
@ -217,9 +229,11 @@ impl<T> Trait<T> for X {
}
(ty::Param(p), ty::Closure(..) | ty::Coroutine(..)) => {
let generics = tcx.generics_of(body_owner_def_id);
let p_span = tcx.def_span(generics.type_param(p, tcx).def_id);
if !sp.contains(p_span) {
diag.span_label(p_span, "expected this type parameter");
if let Some(param) = generics.opt_type_param(p, tcx) {
let p_span = tcx.def_span(param.def_id);
if !sp.contains(p_span) {
diag.span_label(p_span, "expected this type parameter");
}
}
diag.help(format!(
"every closure has a distinct type and so could not always match the \
@ -228,14 +242,16 @@ impl<T> Trait<T> for X {
}
(ty::Param(p), _) | (_, ty::Param(p)) => {
let generics = tcx.generics_of(body_owner_def_id);
let p_span = tcx.def_span(generics.type_param(p, tcx).def_id);
let expected = match (values.expected.kind(), values.found.kind()) {
(ty::Param(_), _) => "expected ",
(_, ty::Param(_)) => "found ",
_ => "",
};
if !sp.contains(p_span) {
diag.span_label(p_span, format!("{expected}this type parameter"));
if let Some(param) = generics.opt_type_param(p, tcx) {
let p_span = tcx.def_span(param.def_id);
let expected = match (values.expected.kind(), values.found.kind()) {
(ty::Param(_), _) => "expected ",
(_, ty::Param(_)) => "found ",
_ => "",
};
if !sp.contains(p_span) {
diag.span_label(p_span, format!("{expected}this type parameter"));
}
}
}
(ty::Alias(ty::Projection | ty::Inherent, proj_ty), _)
@ -368,8 +384,10 @@ impl<T> Trait<T> for X {
return false;
};
let generics = tcx.generics_of(body_owner_def_id);
let def_id = generics.type_param(param_ty, tcx).def_id;
let Some(def_id) = def_id.as_local() else {
let Some(param) = generics.opt_type_param(param_ty, tcx) else {
return false;
};
let Some(def_id) = param.def_id.as_local() else {
return false;
};

28
compiler/rustc_middle/src/ty/generics.rs
View File

@ -237,6 +237,20 @@ impl<'tcx> Generics {
}
}
/// Returns the `GenericParamDef` with the given index if available.
pub fn opt_param_at(
&'tcx self,
param_index: usize,
tcx: TyCtxt<'tcx>,
) -> Option<&'tcx GenericParamDef> {
if let Some(index) = param_index.checked_sub(self.parent_count) {
self.params.get(index)
} else {
tcx.generics_of(self.parent.expect("parent_count > 0 but no parent?"))
.opt_param_at(param_index, tcx)
}
}
pub fn params_to(&'tcx self, param_index: usize, tcx: TyCtxt<'tcx>) -> &'tcx [GenericParamDef] {
if let Some(index) = param_index.checked_sub(self.parent_count) {
&self.params[..index]
@ -268,6 +282,20 @@ impl<'tcx> Generics {
}
}
/// Returns the `GenericParamDef` associated with this `ParamTy` if it belongs to this
/// `Generics`.
pub fn opt_type_param(
&'tcx self,
param: &ParamTy,
tcx: TyCtxt<'tcx>,
) -> Option<&'tcx GenericParamDef> {
let param = self.opt_param_at(param.index as usize, tcx)?;
match param.kind {
GenericParamDefKind::Type { .. } => Some(param),
_ => None,
}
}
/// Returns the `GenericParamDef` associated with this `ParamConst`.
pub fn const_param(&'tcx self, param: &ParamConst, tcx: TyCtxt<'tcx>) -> &GenericParamDef {
let param = self.param_at(param.index as usize, tcx);

7
tests/ui/malformed/do-not-ice-on-note_and_explain.rs Normal file
View File

@ -0,0 +1,7 @@
struct A<B>(B);
impl<B>A<B>{fn d(){fn d(){Self(1)}}}
//~^ ERROR the size for values of type `B` cannot be known at compilation time
//~| ERROR the size for values of type `B` cannot be known at compilation time
//~| ERROR mismatched types
//~| ERROR mismatched types
//~| ERROR `main` function not found in crate

79
tests/ui/malformed/do-not-ice-on-note_and_explain.stderr Normal file
View File

@ -0,0 +1,79 @@
error[E0601]: `main` function not found in crate `do_not_ice_on_note_and_explain`
--> $DIR/do-not-ice-on-note_and_explain.rs:2:37
|
LL | impl<B>A<B>{fn d(){fn d(){Self(1)}}}
| ^ consider adding a `main` function to `$DIR/do-not-ice-on-note_and_explain.rs`
error[E0277]: the size for values of type `B` cannot be known at compilation time
--> $DIR/do-not-ice-on-note_and_explain.rs:2:32
|
LL | impl<B>A<B>{fn d(){fn d(){Self(1)}}}
| - ---- ^ doesn't have a size known at compile-time
| | |
| | required by a bound introduced by this call
| this type parameter needs to be `Sized`
|
note: required by a bound in `A`
--> $DIR/do-not-ice-on-note_and_explain.rs:1:10
|
LL | struct A<B>(B);
| ^ required by this bound in `A`
error[E0308]: mismatched types
--> $DIR/do-not-ice-on-note_and_explain.rs:2:32
|
LL | impl<B>A<B>{fn d(){fn d(){Self(1)}}}
| ---- ^ expected type parameter `B`, found integer
| |
| arguments to this function are incorrect
|
= note: expected type parameter `B`
found type `{integer}`
note: tuple struct defined here
--> $DIR/do-not-ice-on-note_and_explain.rs:1:8
|
LL | struct A<B>(B);
| ^
error[E0308]: mismatched types
--> $DIR/do-not-ice-on-note_and_explain.rs:2:27
|
LL | impl<B>A<B>{fn d(){fn d(){Self(1)}}}
| ^^^^^^^ expected `()`, found `A<B>`
|
= note: expected unit type `()`
found struct `A<B>`
help: consider using a semicolon here
|
LL | impl<B>A<B>{fn d(){fn d(){Self(1);}}}
| +
help: try adding a return type
|
LL | impl<B>A<B>{fn d(){fn d() -> A<B>{Self(1)}}}
| +++++++
error[E0277]: the size for values of type `B` cannot be known at compilation time
--> $DIR/do-not-ice-on-note_and_explain.rs:2:27
|
LL | impl<B>A<B>{fn d(){fn d(){Self(1)}}}
| - ^^^^^^^ doesn't have a size known at compile-time
| |
| this type parameter needs to be `Sized`
|
note: required by a bound in `A`
--> $DIR/do-not-ice-on-note_and_explain.rs:1:10
|
LL | struct A<B>(B);
| ^ required by this bound in `A`
help: you could relax the implicit `Sized` bound on `B` if it were used through indirection like `&B` or `Box<B>`
--> $DIR/do-not-ice-on-note_and_explain.rs:1:10
|
LL | struct A<B>(B);
| ^ - ...if indirection were used here: `Box<B>`
| |
| this could be changed to `B: ?Sized`...
error: aborting due to 5 previous errors
Some errors have detailed explanations: E0277, E0308, E0601.
For more information about an error, try `rustc --explain E0277`.