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Rollup merge of rust-lang#126620 - oli-obk:taint_errors, r=fee1-dead
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Actually taint InferCtxt when a fulfillment error is emitted

And avoid checking the global error counter

fixes rust-lang#122044
fixes rust-lang#123255
fixes rust-lang#123276
fixes rust-lang#125799
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@jieyouxu
jieyouxu authored Jun 19, 2024
2 parents 58db9d0 + e4c9a8c commit 53ecfe7
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Showing 42 changed files with 595 additions and 238 deletions.
11 changes: 1 addition & 10 deletions compiler/rustc_hir_analysis/src/check/wfcheck.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -119,16 +119,7 @@ where

let errors = wfcx.select_all_or_error();
if !errors.is_empty() {
let err = infcx.err_ctxt().report_fulfillment_errors(errors);
if tcx.dcx().has_errors().is_some() {
return Err(err);
} else {
// HACK(oli-obk): tests/ui/specialization/min_specialization/specialize_on_type_error.rs
// causes an delayed bug during normalization, without reporting an error, so we need
// to act as if no error happened, in order to let our callers continue and report an
// error later in check_impl_items_against_trait.
return Ok(());
}
return Err(infcx.err_ctxt().report_fulfillment_errors(errors));
}

debug!(?assumed_wf_types);
Expand Down
2 changes: 1 addition & 1 deletion compiler/rustc_hir_typeck/src/writeback.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -793,7 +793,7 @@ impl<'cx, 'tcx> Resolver<'cx, 'tcx> {
}

fn report_error(&self, p: impl Into<ty::GenericArg<'tcx>>) -> ErrorGuaranteed {
if let Some(guar) = self.fcx.dcx().has_errors() {
if let Some(guar) = self.fcx.tainted_by_errors() {
guar
} else {
self.fcx
Expand Down
188 changes: 103 additions & 85 deletions compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2776,97 +2776,115 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
let mut this = "this bound";
let mut note = None;
let mut help = None;
if let ty::PredicateKind::Clause(clause) = predicate.kind().skip_binder()
&& let ty::ClauseKind::Trait(trait_pred) = clause
{
let def_id = trait_pred.def_id();
let visible_item = if let Some(local) = def_id.as_local() {
// Check for local traits being reachable.
let vis = &tcx.resolutions(()).effective_visibilities;
// Account for non-`pub` traits in the root of the local crate.
let is_locally_reachable = tcx.parent(def_id).is_crate_root();
vis.is_reachable(local) || is_locally_reachable
} else {
// Check for foreign traits being reachable.
tcx.visible_parent_map(()).get(&def_id).is_some()
};
if tcx.is_lang_item(def_id, LangItem::Sized) {
// Check if this is an implicit bound, even in foreign crates.
if tcx
.generics_of(item_def_id)
.own_params
.iter()
.any(|param| tcx.def_span(param.def_id) == span)
{
a = "an implicit `Sized`";
this = "the implicit `Sized` requirement on this type parameter";
}
if let Some(hir::Node::TraitItem(hir::TraitItem {
generics,
kind: hir::TraitItemKind::Type(bounds, None),
..
})) = tcx.hir().get_if_local(item_def_id)
// Do not suggest relaxing if there is an explicit `Sized` obligation.
&& !bounds.iter()
.filter_map(|bound| bound.trait_ref())
.any(|tr| tr.trait_def_id() == tcx.lang_items().sized_trait())
{
let (span, separator) = if let [.., last] = bounds {
(last.span().shrink_to_hi(), " +")
if let ty::PredicateKind::Clause(clause) = predicate.kind().skip_binder() {
match clause {
ty::ClauseKind::Trait(trait_pred) => {
let def_id = trait_pred.def_id();
let visible_item = if let Some(local) = def_id.as_local() {
// Check for local traits being reachable.
let vis = &tcx.resolutions(()).effective_visibilities;
// Account for non-`pub` traits in the root of the local crate.
let is_locally_reachable = tcx.parent(def_id).is_crate_root();
vis.is_reachable(local) || is_locally_reachable
} else {
(generics.span.shrink_to_hi(), ":")
// Check for foreign traits being reachable.
tcx.visible_parent_map(()).get(&def_id).is_some()
};
err.span_suggestion_verbose(
span,
"consider relaxing the implicit `Sized` restriction",
format!("{separator} ?Sized"),
Applicability::MachineApplicable,
);
if tcx.is_lang_item(def_id, LangItem::Sized) {
// Check if this is an implicit bound, even in foreign crates.
if tcx
.generics_of(item_def_id)
.own_params
.iter()
.any(|param| tcx.def_span(param.def_id) == span)
{
a = "an implicit `Sized`";
this =
"the implicit `Sized` requirement on this type parameter";
}
if let Some(hir::Node::TraitItem(hir::TraitItem {
generics,
kind: hir::TraitItemKind::Type(bounds, None),
..
})) = tcx.hir().get_if_local(item_def_id)
// Do not suggest relaxing if there is an explicit `Sized` obligation.
&& !bounds.iter()
.filter_map(|bound| bound.trait_ref())
.any(|tr| tr.trait_def_id() == tcx.lang_items().sized_trait())
{
let (span, separator) = if let [.., last] = bounds {
(last.span().shrink_to_hi(), " +")
} else {
(generics.span.shrink_to_hi(), ":")
};
err.span_suggestion_verbose(
span,
"consider relaxing the implicit `Sized` restriction",
format!("{separator} ?Sized"),
Applicability::MachineApplicable,
);
}
}
if let DefKind::Trait = tcx.def_kind(item_def_id)
&& !visible_item
{
note = Some(format!(
"`{short_item_name}` is a \"sealed trait\", because to implement it \
you also need to implement `{}`, which is not accessible; this is \
usually done to force you to use one of the provided types that \
already implement it",
with_no_trimmed_paths!(tcx.def_path_str(def_id)),
));
let impls_of = tcx.trait_impls_of(def_id);
let impls = impls_of
.non_blanket_impls()
.values()
.flatten()
.chain(impls_of.blanket_impls().iter())
.collect::<Vec<_>>();
if !impls.is_empty() {
let len = impls.len();
let mut types = impls
.iter()
.map(|t| {
with_no_trimmed_paths!(format!(
" {}",
tcx.type_of(*t).instantiate_identity(),
))
})
.collect::<Vec<_>>();
let post = if types.len() > 9 {
types.truncate(8);
format!("\nand {} others", len - 8)
} else {
String::new()
};
help = Some(format!(
"the following type{} implement{} the trait:\n{}{post}",
pluralize!(len),
if len == 1 { "s" } else { "" },
types.join("\n"),
));
}
}
}
}
if let DefKind::Trait = tcx.def_kind(item_def_id)
&& !visible_item
{
note = Some(format!(
"`{short_item_name}` is a \"sealed trait\", because to implement it \
you also need to implement `{}`, which is not accessible; this is \
usually done to force you to use one of the provided types that \
already implement it",
with_no_trimmed_paths!(tcx.def_path_str(def_id)),
));
let impls_of = tcx.trait_impls_of(def_id);
let impls = impls_of
.non_blanket_impls()
.values()
.flatten()
.chain(impls_of.blanket_impls().iter())
.collect::<Vec<_>>();
if !impls.is_empty() {
let len = impls.len();
let mut types = impls
.iter()
.map(|t| {
with_no_trimmed_paths!(format!(
" {}",
tcx.type_of(*t).instantiate_identity(),
))
})
.collect::<Vec<_>>();
let post = if types.len() > 9 {
types.truncate(8);
format!("\nand {} others", len - 8)
ty::ClauseKind::ConstArgHasType(..) => {
let descr =
format!("required by a const generic parameter in `{item_name}`");
if span.is_visible(sm) {
let msg = format!(
"required by this const generic parameter in `{short_item_name}`"
);
multispan.push_span_label(span, msg);
err.span_note(multispan, descr);
} else {
String::new()
};
help = Some(format!(
"the following type{} implement{} the trait:\n{}{post}",
pluralize!(len),
if len == 1 { "s" } else { "" },
types.join("\n"),
));
err.span_note(tcx.def_span(item_def_id), descr);
}
return;
}
_ => (),
}
};
}
let descr = format!("required by {a} bound in `{item_name}`");
if span.is_visible(sm) {
let msg = format!("required by {this} in `{short_item_name}`");
Expand Down
23 changes: 8 additions & 15 deletions compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -179,6 +179,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
for (error, suppressed) in iter::zip(&errors, &is_suppressed) {
if !suppressed && error.obligation.cause.span.from_expansion() == from_expansion {
let guar = self.report_fulfillment_error(error);
self.infcx.set_tainted_by_errors(guar);
reported = Some(guar);
// We want to ignore desugarings here: spans are equivalent even
// if one is the result of a desugaring and the other is not.
Expand Down Expand Up @@ -2686,22 +2687,14 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
}
}

// Given some `ConstArgHasType(?x, usize)`, we should not emit an error such as
// "type annotations needed: cannot satisfy the constant `_` has type `usize`"
// Instead we should emit a normal error suggesting the user to turbofish the
// const parameter that is currently being inferred. Unfortunately we cannot
// nicely emit such an error so we delay an ICE incase nobody else reports it
// for us.
ty::PredicateKind::Clause(ty::ClauseKind::ConstArgHasType(ct, ty)) => {
return self.tcx.sess.dcx().span_delayed_bug(
ty::PredicateKind::Clause(ty::ClauseKind::ConstArgHasType(ct, ..)) => self
.emit_inference_failure_err(
obligation.cause.body_id,
span,
format!(
"`ambiguous ConstArgHasType({:?}, {:?}) unaccompanied by inference error`",
ct, ty
),
);
}

ct.into(),
ErrorCode::E0284,
true,
),
ty::PredicateKind::NormalizesTo(ty::NormalizesTo { alias, term })
if term.is_infer() =>
{
Expand Down
38 changes: 0 additions & 38 deletions tests/crashes/122044.rs
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This file was deleted.

13 changes: 0 additions & 13 deletions tests/crashes/123255.rs
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This file was deleted.

2 changes: 2 additions & 0 deletions tests/incremental/const-generics/issue-64087.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -6,4 +6,6 @@ fn combinator<T, const S: usize>() -> [T; S] {}
fn main() {
combinator().into_iter();
//[cfail1]~^ ERROR type annotations needed
//[cfail1]~| ERROR type annotations needed
//[cfail1]~| ERROR type annotations needed
}
1 change: 1 addition & 0 deletions tests/ui/const-generics/defaults/doesnt_infer.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,4 +12,5 @@ fn main() {
let foo = Foo::<1>::foo();
let foo = Foo::foo();
//~^ ERROR type annotations needed for `Foo<_>`
//~| ERROR type annotations needed
}
31 changes: 27 additions & 4 deletions tests/ui/const-generics/defaults/doesnt_infer.stderr
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Original file line number Diff line number Diff line change
@@ -1,14 +1,37 @@
error[E0282]: type annotations needed for `Foo<_>`
error[E0284]: type annotations needed for `Foo<_>`
--> $DIR/doesnt_infer.rs:13:9
|
LL | let foo = Foo::foo();
| ^^^
| ^^^ ---------- type must be known at this point
|
note: required by a const generic parameter in `Foo::<N>::foo`
--> $DIR/doesnt_infer.rs:5:6
|
LL | impl<const N: u32> Foo<N> {
| ^^^^^^^^^^^^ required by this const generic parameter in `Foo::<N>::foo`
LL | fn foo() -> Self {
| --- required by a bound in this associated function
help: consider giving `foo` an explicit type, where the value of const parameter `N` is specified
|
LL | let foo: Foo<N> = Foo::foo();
| ++++++++

error[E0284]: type annotations needed for `Foo<_>`
--> $DIR/doesnt_infer.rs:13:9
|
LL | let foo = Foo::foo();
| ^^^ --- type must be known at this point
|
note: required by a const generic parameter in `Foo`
--> $DIR/doesnt_infer.rs:3:12
|
LL | struct Foo<const N: u32 = 2>;
| ^^^^^^^^^^^^^^^^ required by this const generic parameter in `Foo`
help: consider giving `foo` an explicit type, where the value of const parameter `N` is specified
|
LL | let foo: Foo<N> = Foo::foo();
| ++++++++

error: aborting due to 1 previous error
error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0282`.
For more information about this error, try `rustc --explain E0284`.
9 changes: 7 additions & 2 deletions tests/ui/const-generics/defaults/rp_impl_trait_fail.stderr
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Original file line number Diff line number Diff line change
Expand Up @@ -31,18 +31,23 @@ LL | 1_u64
|
= help: the trait `Traitor<1, 2>` is implemented for `u64`

error[E0282]: type annotations needed
error[E0284]: type annotations needed
--> $DIR/rp_impl_trait_fail.rs:28:5
|
LL | uwu();
| ^^^ cannot infer the value of the const parameter `N` declared on the function `uwu`
|
note: required by a const generic parameter in `uwu`
--> $DIR/rp_impl_trait_fail.rs:16:8
|
LL | fn uwu<const N: u8>() -> impl Traitor<N> {
| ^^^^^^^^^^^ required by this const generic parameter in `uwu`
help: consider specifying the generic argument
|
LL | uwu::<N>();
| +++++

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0277, E0282.
Some errors have detailed explanations: E0277, E0284.
For more information about an error, try `rustc --explain E0277`.
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