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(Mostly) revert "Account for type param from other item in `note_and_…
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…explain`"

This mostly reverts commit 7449478.
It also removes an `opt_param_at` that really is unnecessary given our
ICE policy for malformed intrinsics.
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@compiler-errors
compiler-errors committed Apr 20, 2024
1 parent c052858 commit 1276a2e
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Showing 3 changed files with 45 additions and 93 deletions.
5 changes: 2 additions & 3 deletions compiler/rustc_hir_analysis/src/check/intrinsic.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -162,9 +162,8 @@ pub fn check_intrinsic_type(
) {
let generics = tcx.generics_of(intrinsic_id);
let param = |n| {
if let Some(&ty::GenericParamDef {
name, kind: ty::GenericParamDefKind::Type { .. }, ..
}) = generics.opt_param_at(n as usize, tcx)
if let &ty::GenericParamDef { name, kind: ty::GenericParamDefKind::Type { .. }, .. } =
generics.param_at(n as usize, tcx)
{
Ty::new_param(tcx, n, name)
} else {
Expand Down
105 changes: 43 additions & 62 deletions compiler/rustc_infer/src/infer/error_reporting/note_and_explain.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -54,17 +54,13 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
}
(ty::Param(expected), ty::Param(found)) => {
let generics = tcx.generics_of(body_owner_def_id);
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 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(found, tcx) {
let f_span = tcx.def_span(param.def_id);
if !sp.contains(f_span) {
diag.span_label(f_span, "found 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");
}
diag.note(
"a type parameter was expected, but a different one was found; \
Expand All @@ -87,29 +83,22 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
| (ty::Alias(ty::Projection, proj), ty::Param(p))
if !tcx.is_impl_trait_in_trait(proj.def_id) =>
{
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.local_def_id_to_hir_id(id);
let generics = tcx.parent_hir_node(local_id).generics()?;
Some((id, generics))
})
});
let param = tcx.generics_of(body_owner_def_id).type_param(p, tcx);
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"));
}
let parent = p_def_id.as_local().and_then(|id| {
let local_id = tcx.local_def_id_to_hir_id(id);
let generics = tcx.parent_hir_node(local_id).generics()?;
Some((id, generics))
});
let mut note = true;
if let Some((local_id, generics)) = parent {
// Synthesize the associated type restriction `Add<Output = Expected>`.
Expand Down Expand Up @@ -183,16 +172,14 @@ 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);
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"));
}
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"));
}
diag.help("type parameters must be constrained to match other types");
if tcx.sess.teach(diag.code.unwrap()) {
Expand Down Expand Up @@ -233,11 +220,9 @@ impl<T> Trait<T> for X {
ty::Closure(..) | ty::CoroutineClosure(..) | ty::Coroutine(..),
) => {
let generics = tcx.generics_of(body_owner_def_id);
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");
}
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");
}
diag.help(format!(
"every closure has a distinct type and so could not always match the \
Expand All @@ -246,16 +231,14 @@ impl<T> Trait<T> for X {
}
(ty::Param(p), _) | (_, ty::Param(p)) => {
let generics = tcx.generics_of(body_owner_def_id);
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"));
}
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"));
}
}
(ty::Alias(ty::Projection | ty::Inherent, proj_ty), _)
Expand Down Expand Up @@ -545,10 +528,8 @@ impl<T> Trait<T> for X {
return false;
};
let generics = tcx.generics_of(body_owner_def_id);
let Some(param) = generics.opt_type_param(param_ty, tcx) else {
return false;
};
let Some(def_id) = param.def_id.as_local() else {
let def_id = generics.type_param(param_ty, tcx).def_id;
let Some(def_id) = def_id.as_local() else {
return false;
};

Expand Down
28 changes: 0 additions & 28 deletions compiler/rustc_middle/src/ty/generics.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -237,20 +237,6 @@ 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]
Expand Down Expand Up @@ -282,20 +268,6 @@ 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);
Expand Down

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