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Auto merge of #130016 - matthiaskrgr:rollup-fopistw, r=matthiaskrgr

Browse Source 
Rollup of 6 pull requests

Successful merges:

 - #129021 (Check WF of source type's signature on fn pointer cast)
 - #129781 (Make `./x.py <cmd> compiler/<crate>` aware of the crate's features)
 - #129963 (Inaccurate `{Path,OsStr}::to_string_lossy()` documentation)
 - #129969 (Make `Ty::boxed_ty` return an `Option`)
 - #129995 (Remove wasm32-wasip2's tier 2 status from release notes)
 - #130013 (coverage: Count await when the Future is immediately ready )

r? `@ghost`
`@rustbot` modify labels: rollup
This commit is contained in:
bors 2024-09-06 07:18:50 +00:00
commit a3af2085cc
47 changed files with 396 additions and 139 deletions
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1
RELEASES.md
View File

@ -34,7 +34,6 @@ Compiler
- [Add Tier 3 `std` Xtensa targets:](https://github.com/rust-lang/rust/pull/126380/) `xtensa-esp32-espidf`, `xtensa-esp32s2-espidf`, `xtensa-esp32s3-espidf`
- [Add Tier 3 i686 Redox OS target:](https://github.com/rust-lang/rust/pull/126192/) `i686-unknown-redox`
- [Promote `arm64ec-pc-windows-msvc` to Tier 2.](https://github.com/rust-lang/rust/pull/126039/)
- [Promote `wasm32-wasip2` to Tier 2.](https://github.com/rust-lang/rust/pull/126967/)
- [Promote `loongarch64-unknown-linux-musl` to Tier 2 with host tools.](https://github.com/rust-lang/rust/pull/126298/)
- [Enable full tools and profiler for LoongArch Linux targets.](https://github.com/rust-lang/rust/pull/127078/)
- [Unconditionally warn on usage of `wasm32-wasi`.](https://github.com/rust-lang/rust/pull/126662/) (see compatibility note below)

3
compiler/rustc_borrowck/src/diagnostics/explain_borrow.rs
View File

@ -662,9 +662,10 @@ fn was_captured_by_trait_object(&self, borrow: &BorrowData<'tcx>) -> bool {
// `&dyn Trait`
ty::Ref(_, ty, _) if ty.is_trait() => true,
// `Box<dyn Trait>`
_ if ty.is_box() && ty.boxed_ty().is_trait() => {
_ if ty.boxed_ty().is_some_and(Ty::is_trait) => {
true
}
// `dyn Trait`
_ if ty.is_trait() => true,
// Anything else.

4
compiler/rustc_borrowck/src/diagnostics/mod.rs
View File

@ -345,9 +345,9 @@ fn describe_field_from_ty(
variant_index: Option<VariantIdx>,
including_tuple_field: IncludingTupleField,
) -> Option<String> {
if ty.is_box() {
if let Some(boxed_ty) = ty.boxed_ty() {
// If the type is a box, the field is described from the boxed type
self.describe_field_from_ty(ty.boxed_ty(), field, variant_index, including_tuple_field)
self.describe_field_from_ty(boxed_ty, field, variant_index, including_tuple_field)
} else {
match *ty.kind() {
ty::Adt(def, _) => {

71
compiler/rustc_borrowck/src/type_check/mod.rs
View File

@ -1979,19 +1979,76 @@ fn check_rvalue(&mut self, body: &Body<'tcx>, rvalue: &Rvalue<'tcx>, location: L
match cast_kind {
CastKind::PointerCoercion(PointerCoercion::ReifyFnPointer) => {
let fn_sig = op.ty(body, tcx).fn_sig(tcx);
let src_sig = op.ty(body, tcx).fn_sig(tcx);
// HACK: This shouldn't be necessary... We can remove this when we actually
// get binders with where clauses, then elaborate implied bounds into that
// binder, and implement a higher-ranked subtyping algorithm that actually
// respects these implied bounds.
//
// This protects against the case where we are casting from a higher-ranked
// fn item to a non-higher-ranked fn pointer, where the cast throws away
// implied bounds that would've needed to be checked at the call site. This
// only works when we're casting to a non-higher-ranked fn ptr, since
// placeholders in the target signature could have untracked implied
// bounds, resulting in incorrect errors.
//
// We check that this signature is WF before subtyping the signature with
// the target fn sig.
if src_sig.has_bound_regions()
&& let ty::FnPtr(target_fn_tys, target_hdr) = *ty.kind()
&& let target_sig = target_fn_tys.with(target_hdr)
&& let Some(target_sig) = target_sig.no_bound_vars()
{
let src_sig = self.infcx.instantiate_binder_with_fresh_vars(
span,
BoundRegionConversionTime::HigherRankedType,
src_sig,
);
let src_ty = Ty::new_fn_ptr(self.tcx(), ty::Binder::dummy(src_sig));
self.prove_predicate(
ty::ClauseKind::WellFormed(src_ty.into()),
location.to_locations(),
ConstraintCategory::Cast { unsize_to: None },
);
let src_ty = self.normalize(src_ty, location);
if let Err(terr) = self.sub_types(
src_ty,
*ty,
location.to_locations(),
ConstraintCategory::Cast { unsize_to: None },
) {
span_mirbug!(
self,
rvalue,
"equating {:?} with {:?} yields {:?}",
target_sig,
src_sig,
terr
);
};
}
let src_ty = Ty::new_fn_ptr(tcx, src_sig);
// HACK: We want to assert that the signature of the source fn is
// well-formed, because we don't enforce that via the WF of FnDef
// types normally. This should be removed when we improve the tracking
// of implied bounds of fn signatures.
self.prove_predicate(
ty::ClauseKind::WellFormed(src_ty.into()),
location.to_locations(),
ConstraintCategory::Cast { unsize_to: None },
);
// The type that we see in the fcx is like
// `foo::<'a, 'b>`, where `foo` is the path to a
// function definition. When we extract the
// signature, it comes from the `fn_sig` query,
// and hence may contain unnormalized results.
let fn_sig = self.normalize(fn_sig, location);
let ty_fn_ptr_from = Ty::new_fn_ptr(tcx, fn_sig);
let src_ty = self.normalize(src_ty, location);
if let Err(terr) = self.sub_types(
ty_fn_ptr_from,
src_ty,
*ty,
location.to_locations(),
ConstraintCategory::Cast { unsize_to: None },
@ -2000,7 +2057,7 @@ fn check_rvalue(&mut self, body: &Body<'tcx>, rvalue: &Rvalue<'tcx>, location: L
self,
rvalue,
"equating {:?} with {:?} yields {:?}",
ty_fn_ptr_from,
src_ty,
ty,
terr
);

2
compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs
View File

@ -456,7 +456,7 @@ pub(crate) fn type_di_node<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>, t: Ty<'tcx>) ->
if def.is_box()
&& args.get(1).map_or(true, |arg| cx.layout_of(arg.expect_ty()).is_1zst()) =>
{
build_pointer_or_reference_di_node(cx, t, t.boxed_ty(), unique_type_id)
build_pointer_or_reference_di_node(cx, t, t.expect_boxed_ty(), unique_type_id)
}
ty::FnDef(..) | ty::FnPtr(..) => build_subroutine_type_di_node(cx, unique_type_id),
ty::Closure(..) => build_closure_env_di_node(cx, unique_type_id),

2
compiler/rustc_const_eval/src/interpret/call.rs
View File

@ -189,7 +189,7 @@ fn layout_compat(
ty::Ref(_, ty, _) => *ty,
ty::RawPtr(ty, _) => *ty,
// We only accept `Box` with the default allocator.
_ if ty.is_box_global(*self.tcx) => ty.boxed_ty(),
_ if ty.is_box_global(*self.tcx) => ty.expect_boxed_ty(),
_ => return Ok(None),
}))
};

3
compiler/rustc_hir_typeck/src/method/prelude_edition_lints.rs
View File

@ -63,8 +63,7 @@ pub(super) fn lint_edition_dependent_dot_call(
// Instead, the problem is that the array-into_iter hack will no longer
// apply in Rust 2021.
(ARRAY_INTO_ITER, "2021")
} else if self_ty.is_box()
&& self_ty.boxed_ty().is_slice()
} else if self_ty.boxed_ty().is_some_and(Ty::is_slice)
&& !span.at_least_rust_2024()
{
// In this case, it wasn't really a prelude addition that was the problem.

3
compiler/rustc_hir_typeck/src/method/probe.rs
View File

@ -1485,8 +1485,7 @@ fn consider_probe(
// Some trait methods are excluded for boxed slices before 2024.
// (`boxed_slice.into_iter()` wants a slice iterator for compatibility.)
if self_ty.is_box()
&& self_ty.boxed_ty().is_slice()
if self_ty.boxed_ty().is_some_and(Ty::is_slice)
&& !method_name.span.at_least_rust_2024()
{
let trait_def = self.tcx.trait_def(poly_trait_ref.def_id());

7
compiler/rustc_lint/src/shadowed_into_iter.rs
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@ -94,12 +94,9 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'tcx>) {
fn is_ref_to_array(ty: Ty<'_>) -> bool {
if let ty::Ref(_, pointee_ty, _) = *ty.kind() { pointee_ty.is_array() } else { false }
}
fn is_boxed_slice(ty: Ty<'_>) -> bool {
ty.is_box() && ty.boxed_ty().is_slice()
}
fn is_ref_to_boxed_slice(ty: Ty<'_>) -> bool {
if let ty::Ref(_, pointee_ty, _) = *ty.kind() {
is_boxed_slice(pointee_ty)
pointee_ty.boxed_ty().is_some_and(Ty::is_slice)
} else {
false
}
@ -119,7 +116,7 @@ fn is_ref_to_boxed_slice(ty: Ty<'_>) -> bool {
.iter()
.copied()
.take_while(|ty| !is_ref_to_boxed_slice(*ty))
.position(|ty| is_boxed_slice(ty))
.position(|ty| ty.boxed_ty().is_some_and(Ty::is_slice))
{
(BOXED_SLICE_INTO_ITER, "Box<[T]>", "2024", idx == 0)
} else {

6
compiler/rustc_lint/src/types.rs
View File

@ -1304,8 +1304,10 @@ fn check_type_for_ffi(
match *ty.kind() {
ty::Adt(def, args) => {
if def.is_box() && matches!(self.mode, CItemKind::Definition) {
if ty.boxed_ty().is_sized(tcx, self.cx.param_env) {
if let Some(boxed) = ty.boxed_ty()
&& matches!(self.mode, CItemKind::Definition)
{
if boxed.is_sized(tcx, self.cx.param_env) {
return FfiSafe;
} else {
return FfiUnsafe {

5
compiler/rustc_lint/src/unused.rs
View File

@ -283,9 +283,8 @@ fn is_ty_must_use<'tcx>(
}
match *ty.kind() {
ty::Adt(..) if ty.is_box() => {
let boxed_ty = ty.boxed_ty();
is_ty_must_use(cx, boxed_ty, expr, span)
ty::Adt(..) if let Some(boxed) = ty.boxed_ty() => {
is_ty_must_use(cx, boxed, expr, span)
.map(|inner| MustUsePath::Boxed(Box::new(inner)))
}
ty::Adt(def, args) if cx.tcx.is_lang_item(def.did(), LangItem::Pin) => {

6
compiler/rustc_middle/src/ty/layout.rs
View File

@ -1075,11 +1075,13 @@ fn ty_and_layout_pointee_info_at(
// the raw pointer, so size and align are set to the boxed type, but `pointee.safe`
// will still be `None`.
if let Some(ref mut pointee) = result {
if offset.bytes() == 0 && this.ty.is_box() {
if offset.bytes() == 0
&& let Some(boxed_ty) = this.ty.boxed_ty()
{
debug_assert!(pointee.safe.is_none());
let optimize = tcx.sess.opts.optimize != OptLevel::No;
pointee.safe = Some(PointerKind::Box {
unpin: optimize && this.ty.boxed_ty().is_unpin(tcx, cx.param_env()),
unpin: optimize && boxed_ty.is_unpin(tcx, cx.param_env()),
global: this.ty.is_box_global(tcx),
});
}

15
compiler/rustc_middle/src/ty/sty.rs
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@ -1170,14 +1170,19 @@ pub fn is_box_global(self, tcx: TyCtxt<'tcx>) -> bool {
}
}
/// Panics if called on any type other than `Box<T>`.
pub fn boxed_ty(self) -> Ty<'tcx> {
pub fn boxed_ty(self) -> Option<Ty<'tcx>> {
match self.kind() {
Adt(def, args) if def.is_box() => args.type_at(0),
_ => bug!("`boxed_ty` is called on non-box type {:?}", self),
Adt(def, args) if def.is_box() => Some(args.type_at(0)),
_ => None,
}
}
/// Panics if called on any type other than `Box<T>`.
pub fn expect_boxed_ty(self) -> Ty<'tcx> {
self.boxed_ty()
.unwrap_or_else(|| bug!("`expect_boxed_ty` is called on non-box type {:?}", self))
}
/// A scalar type is one that denotes an atomic datum, with no sub-components.
/// (A RawPtr is scalar because it represents a non-managed pointer, so its
/// contents are abstract to rustc.)
@ -1323,7 +1328,7 @@ fn visit_ty(&mut self, t: Ty<'tcx>) -> Self::Result {
/// Some types -- notably unsafe ptrs -- can only be dereferenced explicitly.
pub fn builtin_deref(self, explicit: bool) -> Option<Ty<'tcx>> {
match *self.kind() {
Adt(def, _) if def.is_box() => Some(self.boxed_ty()),
_ if let Some(boxed) = self.boxed_ty() => Some(boxed),
Ref(_, ty, _) => Some(ty),
RawPtr(ty, _) if explicit => Some(ty),
_ => None,

2
compiler/rustc_middle/src/ty/util.rs
View File

@ -1628,7 +1628,7 @@ pub fn determine<P>(self_arg_ty: Ty<'tcx>, is_self_ty: P) -> ExplicitSelf<'tcx>
_ if is_self_ty(self_arg_ty) => ByValue,
ty::Ref(region, ty, mutbl) if is_self_ty(ty) => ByReference(region, mutbl),
ty::RawPtr(ty, mutbl) if is_self_ty(ty) => ByRawPointer(mutbl),
ty::Adt(def, _) if def.is_box() && is_self_ty(self_arg_ty.boxed_ty()) => ByBox,
_ if self_arg_ty.boxed_ty().is_some_and(is_self_ty) => ByBox,
_ => Other,
}
}

36
compiler/rustc_mir_transform/src/coverage/spans.rs
View File

@ -3,7 +3,7 @@
use rustc_data_structures::captures::Captures;
use rustc_data_structures::fx::FxHashSet;
use rustc_middle::mir;
use rustc_span::Span;
use rustc_span::{DesugaringKind, ExpnKind, MacroKind, Span};
use tracing::{debug, debug_span, instrument};
use crate::coverage::graph::{BasicCoverageBlock, CoverageGraph};
@ -25,7 +25,7 @@ pub(super) fn extract_refined_covspans(
// First, perform the passes that need macro information.
covspans.sort_by(|a, b| basic_coverage_blocks.cmp_in_dominator_order(a.bcb, b.bcb));
remove_unwanted_macro_spans(&mut covspans);
remove_unwanted_expansion_spans(&mut covspans);
split_visible_macro_spans(&mut covspans);
// We no longer need the extra information in `SpanFromMir`, so convert to `Covspan`.
@ -76,18 +76,24 @@ pub(super) fn extract_refined_covspans(
/// invocation, which is unhelpful. Keeping only the first such span seems to
/// give better mappings, so remove the others.
///
/// Similarly, `await` expands to a branch on the discriminant of `Poll`, which
/// leads to incorrect coverage if the `Future` is immediately ready (#98712).
///
/// (The input spans should be sorted in BCB dominator order, so that the
/// retained "first" span is likely to dominate the others.)
fn remove_unwanted_macro_spans(covspans: &mut Vec<SpanFromMir>) {
let mut seen_macro_spans = FxHashSet::default();
covspans.retain(|covspan| {
// Ignore (retain) non-macro-expansion spans.
if covspan.visible_macro.is_none() {
return true;
}
fn remove_unwanted_expansion_spans(covspans: &mut Vec<SpanFromMir>) {
let mut deduplicated_spans = FxHashSet::default();
// Retain only the first macro-expanded covspan with this span.
seen_macro_spans.insert(covspan.span)
covspans.retain(|covspan| {
match covspan.expn_kind {
// Retain only the first await-related or macro-expanded covspan with this span.
Some(ExpnKind::Desugaring(kind)) if kind == DesugaringKind::Await => {
deduplicated_spans.insert(covspan.span)
}
Some(ExpnKind::Macro(MacroKind::Bang, _)) => deduplicated_spans.insert(covspan.span),
// Ignore (retain) other spans.
_ => true,
}
});
}
@ -99,7 +105,9 @@ fn split_visible_macro_spans(covspans: &mut Vec<SpanFromMir>) {
let mut extra_spans = vec![];
covspans.retain(|covspan| {
let Some(visible_macro) = covspan.visible_macro else { return true };
let Some(ExpnKind::Macro(MacroKind::Bang, visible_macro)) = covspan.expn_kind else {
return true;
};
let split_len = visible_macro.as_str().len() as u32 + 1;
let (before, after) = covspan.span.split_at(split_len);
@ -111,8 +119,8 @@ fn split_visible_macro_spans(covspans: &mut Vec<SpanFromMir>) {
return true;
}
extra_spans.push(SpanFromMir::new(before, covspan.visible_macro, covspan.bcb));
extra_spans.push(SpanFromMir::new(after, covspan.visible_macro, covspan.bcb));
extra_spans.push(SpanFromMir::new(before, covspan.expn_kind.clone(), covspan.bcb));
extra_spans.push(SpanFromMir::new(after, covspan.expn_kind.clone(), covspan.bcb));
false // Discard the original covspan that we just split.
});

22
compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs
View File

@ -3,13 +3,13 @@
use rustc_middle::mir::{
self, FakeReadCause, Statement, StatementKind, Terminator, TerminatorKind,
};
use rustc_span::{Span, Symbol};
use rustc_span::{ExpnKind, Span};
use crate::coverage::graph::{
BasicCoverageBlock, BasicCoverageBlockData, CoverageGraph, START_BCB,
};
use crate::coverage::spans::Covspan;
use crate::coverage::unexpand::unexpand_into_body_span_with_visible_macro;
use crate::coverage::unexpand::unexpand_into_body_span_with_expn_kind;
use crate::coverage::ExtractedHirInfo;
pub(crate) struct ExtractedCovspans {
@ -60,7 +60,7 @@ fn bcb_to_initial_coverage_spans<'a, 'tcx>(
let data = &mir_body[bb];
let unexpand = move |expn_span| {
unexpand_into_body_span_with_visible_macro(expn_span, body_span)
unexpand_into_body_span_with_expn_kind(expn_span, body_span)
// Discard any spans that fill the entire body, because they tend
// to represent compiler-inserted code, e.g. implicitly returning `()`.
.filter(|(span, _)| !span.source_equal(body_span))
@ -68,9 +68,9 @@ fn bcb_to_initial_coverage_spans<'a, 'tcx>(
let mut extract_statement_span = |statement| {
let expn_span = filtered_statement_span(statement)?;
let (span, visible_macro) = unexpand(expn_span)?;
let (span, expn_kind) = unexpand(expn_span)?;
initial_covspans.push(SpanFromMir::new(span, visible_macro, bcb));
initial_covspans.push(SpanFromMir::new(span, expn_kind, bcb));
Some(())
};
for statement in data.statements.iter() {
@ -79,9 +79,9 @@ fn bcb_to_initial_coverage_spans<'a, 'tcx>(
let mut extract_terminator_span = |terminator| {
let expn_span = filtered_terminator_span(terminator)?;
let (span, visible_macro) = unexpand(expn_span)?;
let (span, expn_kind) = unexpand(expn_span)?;
initial_covspans.push(SpanFromMir::new(span, visible_macro, bcb));
initial_covspans.push(SpanFromMir::new(span, expn_kind, bcb));
Some(())
};
extract_terminator_span(data.terminator());
@ -214,7 +214,7 @@ pub(crate) struct SpanFromMir {
/// With the exception of `fn_sig_span`, this should always be contained
/// within `body_span`.
pub(crate) span: Span,
pub(crate) visible_macro: Option<Symbol>,
pub(crate) expn_kind: Option<ExpnKind>,
pub(crate) bcb: BasicCoverageBlock,
}
@ -223,12 +223,12 @@ fn for_fn_sig(fn_sig_span: Span) -> Self {
Self::new(fn_sig_span, None, START_BCB)
}
pub(crate) fn new(span: Span, visible_macro: Option<Symbol>, bcb: BasicCoverageBlock) -> Self {
Self { span, visible_macro, bcb }
pub(crate) fn new(span: Span, expn_kind: Option<ExpnKind>, bcb: BasicCoverageBlock) -> Self {
Self { span, expn_kind, bcb }
}
pub(crate) fn into_covspan(self) -> Covspan {
let Self { span, visible_macro: _, bcb } = self;
let Self { span, expn_kind: _, bcb } = self;
Covspan { span, bcb }
}
}

15
compiler/rustc_mir_transform/src/coverage/unexpand.rs
View File

@ -1,4 +1,4 @@
use rustc_span::{ExpnKind, MacroKind, Span, Symbol};
use rustc_span::{ExpnKind, Span};
/// Walks through the expansion ancestors of `original_span` to find a span that
/// is contained in `body_span` and has the same [syntax context] as `body_span`.
@ -13,20 +13,15 @@ pub(crate) fn unexpand_into_body_span(original_span: Span, body_span: Span) -> O
///
/// If the returned span represents a bang-macro invocation (e.g. `foo!(..)`),
/// the returned symbol will be the name of that macro (e.g. `foo`).
pub(crate) fn unexpand_into_body_span_with_visible_macro(
pub(crate) fn unexpand_into_body_span_with_expn_kind(
original_span: Span,
body_span: Span,
) -> Option<(Span, Option<Symbol>)> {
) -> Option<(Span, Option<ExpnKind>)> {
let (span, prev) = unexpand_into_body_span_with_prev(original_span, body_span)?;
let visible_macro = prev
.map(|prev| match prev.ctxt().outer_expn_data().kind {
ExpnKind::Macro(MacroKind::Bang, name) => Some(name),
_ => None,
})
.flatten();
let expn_kind = prev.map(|prev| prev.ctxt().outer_expn_data().kind);
Some((span, visible_macro))
Some((span, expn_kind))
}
/// Walks through the expansion ancestors of `original_span` to find a span that

12
compiler/rustc_mir_transform/src/elaborate_box_derefs.rs
View File

@ -62,11 +62,13 @@ fn visit_place(
let base_ty = self.local_decls[place.local].ty;
// Derefer ensures that derefs are always the first projection
if place.projection.first() == Some(&PlaceElem::Deref) && base_ty.is_box() {
if let Some(PlaceElem::Deref) = place.projection.first()
&& let Some(boxed_ty) = base_ty.boxed_ty()
{
let source_info = self.local_decls[place.local].source_info;
let (unique_ty, nonnull_ty, ptr_ty) =
build_ptr_tys(tcx, base_ty.boxed_ty(), self.unique_did, self.nonnull_did);
build_ptr_tys(tcx, boxed_ty, self.unique_did, self.nonnull_did);
let ptr_local = self.patch.new_temp(ptr_ty, source_info.span);
@ -120,13 +122,15 @@ fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
for (base, elem) in place.iter_projections() {
let base_ty = base.ty(&body.local_decls, tcx).ty;
if elem == PlaceElem::Deref && base_ty.is_box() {
if let PlaceElem::Deref = elem
&& let Some(boxed_ty) = base_ty.boxed_ty()
{
// Clone the projections before us, since now we need to mutate them.
let new_projections =
new_projections.get_or_insert_with(|| base.projection.to_vec());
let (unique_ty, nonnull_ty, ptr_ty) =
build_ptr_tys(tcx, base_ty.boxed_ty(), unique_did, nonnull_did);
build_ptr_tys(tcx, boxed_ty, unique_did, nonnull_did);
new_projections.extend_from_slice(&build_projection(
unique_ty, nonnull_ty, ptr_ty,

7
compiler/rustc_monomorphize/src/collector.rs
View File

@ -1041,8 +1041,11 @@ fn find_vtable_types_for_unsizing<'tcx>(
match (source_ty.kind(), target_ty.kind()) {
(&ty::Ref(_, a, _), &ty::Ref(_, b, _) | &ty::RawPtr(b, _))
| (&ty::RawPtr(a, _), &ty::RawPtr(b, _)) => ptr_vtable(a, b),
(&ty::Adt(def_a, _), &ty::Adt(def_b, _)) if def_a.is_box() && def_b.is_box() => {
ptr_vtable(source_ty.boxed_ty(), target_ty.boxed_ty())
(_, _)
if let Some(source_boxed) = source_ty.boxed_ty()
&& let Some(target_boxed) = target_ty.boxed_ty() =>
{
ptr_vtable(source_boxed, target_boxed)
}
// T as dyn* Trait

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

@ -1,5 +1,7 @@
// tidy-alphabetical-start
#![feature(array_windows)]
#![feature(if_let_guard)]
#![feature(let_chains)]
#![warn(unreachable_pub)]
// tidy-alphabetical-end

3
compiler/rustc_trait_selection/src/error_reporting/infer/mod.rs
View File

@ -348,8 +348,7 @@ fn note_error_origin(
}
}
if let Some(ty::error::ExpectedFound { found, .. }) = exp_found
&& ty.is_box()
&& ty.boxed_ty() == found
&& ty.boxed_ty() == Some(found)
&& let Ok(snippet) = self.tcx.sess.source_map().span_to_snippet(span)
{
err.span_suggestion(

2
library/std/src/ffi/os_str.rs
View File

@ -852,7 +852,7 @@ pub fn to_str(&self) -> Option<&str> {
/// Converts an `OsStr` to a <code>[Cow]<[str]></code>.
///
/// Any non-Unicode sequences are replaced with
/// Any non-UTF-8 sequences are replaced with
/// [`U+FFFD REPLACEMENT CHARACTER`][U+FFFD].
///
/// [U+FFFD]: crate::char::REPLACEMENT_CHARACTER

2
library/std/src/path.rs
View File

@ -2200,7 +2200,7 @@ pub fn to_str(&self) -> Option<&str> {
/// Converts a `Path` to a [`Cow<str>`].
///
/// Any non-Unicode sequences are replaced with
/// Any non-UTF-8 sequences are replaced with
/// [`U+FFFD REPLACEMENT CHARACTER`][U+FFFD].
///
/// [U+FFFD]: super::char::REPLACEMENT_CHARACTER

2
src/bootstrap/src/core/build_steps/check.rs
View File

@ -228,7 +228,7 @@ fn run(self, builder: &Builder<'_>) {
self.override_build_kind.unwrap_or(builder.kind),
);
rustc_cargo(builder, &mut cargo, target, &compiler);
rustc_cargo(builder, &mut cargo, target, &compiler, &self.crates);
// For ./x.py clippy, don't run with --all-targets because
// linting tests and benchmarks can produce very noisy results

2
src/bootstrap/src/core/build_steps/clippy.rs
View File

@ -197,7 +197,7 @@ fn run(self, builder: &Builder<'_>) {
Kind::Clippy,
);
rustc_cargo(builder, &mut cargo, target, &compiler);
rustc_cargo(builder, &mut cargo, target, &compiler, &self.crates);
// Explicitly pass -p for all compiler crates -- this will force cargo
// to also lint the tests/benches/examples for these crates, rather

5
src/bootstrap/src/core/build_steps/compile.rs
View File

@ -988,7 +988,7 @@ fn run(self, builder: &Builder<'_>) -> u32 {
Kind::Build,
);
rustc_cargo(builder, &mut cargo, target, &compiler);
rustc_cargo(builder, &mut cargo, target, &compiler, &self.crates);
// NB: all RUSTFLAGS should be added to `rustc_cargo()` so they will be
// consistently applied by check/doc/test modes too.
@ -1047,10 +1047,11 @@ pub fn rustc_cargo(
cargo: &mut Cargo,
target: TargetSelection,
compiler: &Compiler,
crates: &[String],
) {
cargo
.arg("--features")
.arg(builder.rustc_features(builder.kind, target))
.arg(builder.rustc_features(builder.kind, target, crates))
.arg("--manifest-path")
.arg(builder.src.join("compiler/rustc/Cargo.toml"));

2
src/bootstrap/src/core/build_steps/doc.rs
View File

@ -826,7 +826,7 @@ fn run(self, builder: &Builder<'_>) {
// see https://github.com/rust-lang/rust/pull/122066#issuecomment-1983049222
// cargo.rustdocflag("--generate-link-to-definition");
compile::rustc_cargo(builder, &mut cargo, target, &compiler);
compile::rustc_cargo(builder, &mut cargo, target, &compiler, &self.crates);
cargo.arg("-Zskip-rustdoc-fingerprint");
// Only include compiler crates, no dependencies of those, such as `libc`.

2
src/bootstrap/src/core/build_steps/test.rs
View File

@ -2690,7 +2690,7 @@ fn run(self, builder: &Builder<'_>) {
}
}
Mode::Rustc => {
compile::rustc_cargo(builder, &mut cargo, target, &compiler);
compile::rustc_cargo(builder, &mut cargo, target, &compiler, &self.crates);
}
_ => panic!("can only test libraries"),
};

10
src/bootstrap/src/core/metadata.rs
View File

@ -1,3 +1,4 @@
use std::collections::BTreeMap;
use std::path::PathBuf;
use serde_derive::Deserialize;
@ -21,6 +22,7 @@ struct Package {
manifest_path: String,
dependencies: Vec<Dependency>,
targets: Vec<Target>,
features: BTreeMap<String, Vec<String>>,
}
/// For more information, see the output of
@ -51,7 +53,13 @@ pub fn build(build: &mut Build) {
.map(|dep| dep.name)
.collect();
let has_lib = package.targets.iter().any(|t| t.kind.iter().any(|k| k == "lib"));
let krate = Crate { name: name.clone(), deps, path, has_lib };
let krate = Crate {
name: name.clone(),
deps,
path,
has_lib,
features: package.features.keys().cloned().collect(),
};
let relative_path = krate.local_path(build);
build.crates.insert(name.clone(), krate);
let existing_path = build.crate_paths.insert(relative_path, name);

19
src/bootstrap/src/lib.rs
View File

@ -183,6 +183,7 @@ struct Crate {
deps: HashSet<String>,
path: PathBuf,
has_lib: bool,
features: Vec<String>,
}
impl Crate {
@ -672,16 +673,24 @@ fn std_features(&self, target: TargetSelection) -> String {
}
/// Gets the space-separated set of activated features for the compiler.
fn rustc_features(&self, kind: Kind, target: TargetSelection) -> String {
fn rustc_features(&self, kind: Kind, target: TargetSelection, crates: &[String]) -> String {
let possible_features_by_crates: HashSet<_> = crates
.iter()
.flat_map(|krate| &self.crates[krate].features)
.map(std::ops::Deref::deref)
.collect();
let check = |feature: &str| -> bool {
crates.is_empty() || possible_features_by_crates.contains(feature)
};
let mut features = vec![];
if self.config.jemalloc {
if self.config.jemalloc && check("jemalloc") {
features.push("jemalloc");
}
if self.config.llvm_enabled(target) || kind == Kind::Check {
if (self.config.llvm_enabled(target) || kind == Kind::Check) && check("llvm") {
features.push("llvm");
}
// keep in sync with `bootstrap/compile.rs:rustc_cargo_env`
if self.config.rustc_parallel {
if self.config.rustc_parallel && check("rustc_use_parallel_compiler") {
features.push("rustc_use_parallel_compiler");
}
if self.config.rust_randomize_layout {
@ -693,7 +702,7 @@ fn rustc_features(&self, kind: Kind, target: TargetSelection) -> String {
// which is everything (including debug/trace/etc.)
// if its unset, if debug_assertions is on, then debug_logging will also be on
// as well as tracing *ignoring* this feature when debug_assertions is on
if !self.config.rust_debug_logging {
if !self.config.rust_debug_logging && check("max_level_info") {
features.push("max_level_info");
}

6
src/tools/clippy/clippy_lints/src/escape.rs
View File

@ -50,7 +50,7 @@ pub fn new(conf: &'static Conf) -> Self {
}
fn is_non_trait_box(ty: Ty<'_>) -> bool {
ty.is_box() && !ty.boxed_ty().is_trait()
ty.boxed_ty().is_some_and(|boxed| !boxed.is_trait())
}
struct EscapeDelegate<'a, 'tcx> {
@ -191,8 +191,8 @@ fn fake_read(&mut self, _: &PlaceWithHirId<'tcx>, _: FakeReadCause, _: HirId) {}
impl<'a, 'tcx> EscapeDelegate<'a, 'tcx> {
fn is_large_box(&self, ty: Ty<'tcx>) -> bool {
// Large types need to be boxed to avoid stack overflows.
if ty.is_box() {
self.cx.layout_of(ty.boxed_ty()).map_or(0, |l| l.size.bytes()) > self.too_large_for_stack
if let Some(boxed_ty) = ty.boxed_ty() {
self.cx.layout_of(boxed_ty).map_or(0, |l| l.size.bytes()) > self.too_large_for_stack
} else {
false
}

4
src/tools/clippy/clippy_lints/src/methods/mod.rs
View File

@ -5187,8 +5187,8 @@ fn matches<'a>(self, cx: &LateContext<'a>, parent_ty: Ty<'a>, ty: Ty<'a>) -> boo
fn matches_value<'a>(cx: &LateContext<'a>, parent_ty: Ty<'a>, ty: Ty<'a>) -> bool {
if ty == parent_ty {
true
} else if ty.is_box() {
ty.boxed_ty() == parent_ty
} else if let Some(boxed_ty) = ty.boxed_ty() {
boxed_ty == parent_ty
} else if is_type_diagnostic_item(cx, ty, sym::Rc) || is_type_diagnostic_item(cx, ty, sym::Arc) {
if let ty::Adt(_, args) = ty.kind() {
args.types().next().map_or(false, |t| t == parent_ty)

4
src/tools/clippy/clippy_lints/src/methods/utils.rs
View File

@ -16,7 +16,7 @@ pub(super) fn derefs_to_slice<'tcx>(
fn may_slice<'a>(cx: &LateContext<'a>, ty: Ty<'a>) -> bool {
match ty.kind() {
ty::Slice(_) => true,
ty::Adt(def, _) if def.is_box() => may_slice(cx, ty.boxed_ty()),
ty::Adt(..) if let Some(boxed) = ty.boxed_ty() => may_slice(cx, boxed),
ty::Adt(..) => is_type_diagnostic_item(cx, ty, sym::Vec),
ty::Array(_, size) => size.try_eval_target_usize(cx.tcx, cx.param_env).is_some(),
ty::Ref(_, inner, _) => may_slice(cx, *inner),
@ -33,7 +33,7 @@ fn may_slice<'a>(cx: &LateContext<'a>, ty: Ty<'a>) -> bool {
} else {
match ty.kind() {
ty::Slice(_) => Some(expr),
ty::Adt(def, _) if def.is_box() && may_slice(cx, ty.boxed_ty()) => Some(expr),
_ if ty.boxed_ty().is_some_and(|boxed| may_slice(cx, boxed)) => Some(expr),
ty::Ref(_, inner, _) => {
if may_slice(cx, *inner) {
Some(expr)

6
src/tools/clippy/clippy_lints/src/unnecessary_box_returns.rs
View File

@ -75,11 +75,9 @@ fn check_fn_item(&mut self, cx: &LateContext<'_>, decl: &FnDecl<'_>, def_id: Loc
.instantiate_bound_regions_with_erased(cx.tcx.fn_sig(def_id).skip_binder())
.output();
if !return_ty.is_box() {
let Some(boxed_ty) = return_ty.boxed_ty() else {
return;
}
let boxed_ty = return_ty.boxed_ty();
};
// It's sometimes useful to return Box<T> if T is unsized, so don't lint those.
// Also, don't lint if we know that T is very large, in which case returning

4
src/tools/clippy/clippy_utils/src/ty.rs
View File

@ -704,8 +704,8 @@ pub fn expr_sig<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'_>) -> Option<ExprFnS
/// If the type is function like, get the signature for it.
pub fn ty_sig<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<ExprFnSig<'tcx>> {
if ty.is_box() {
return ty_sig(cx, ty.boxed_ty());
if let Some(boxed_ty) = ty.boxed_ty() {
return ty_sig(cx, boxed_ty);
}
match *ty.kind() {
ty::Closure(id, subs) => {

48
tests/coverage/async.cov-map
View File

@ -92,20 +92,18 @@ Number of file 0 mappings: 1
- Code(Counter(0)) at (prev + 25, 1) to (start + 0, 23)
Function name: async::g::{closure#0} (unused)
Raw bytes (69): 0x[01, 01, 00, 0d, 00, 19, 17, 01, 0c, 00, 02, 09, 00, 0a, 00, 00, 0e, 00, 11, 00, 00, 12, 00, 17, 00, 00, 1b, 00, 1c, 00, 00, 20, 00, 22, 00, 01, 09, 00, 0a, 00, 00, 0e, 00, 11, 00, 00, 12, 00, 17, 00, 00, 1b, 00, 1c, 00, 00, 20, 00, 22, 00, 01, 0e, 00, 10, 00, 02, 01, 00, 02]
Raw bytes (59): 0x[01, 01, 00, 0b, 00, 19, 17, 01, 0c, 00, 02, 09, 00, 0a, 00, 00, 0e, 00, 17, 00, 00, 1b, 00, 1c, 00, 00, 20, 00, 22, 00, 01, 09, 00, 0a, 00, 00, 0e, 00, 17, 00, 00, 1b, 00, 1c, 00, 00, 20, 00, 22, 00, 01, 0e, 00, 10, 00, 02, 01, 00, 02]
Number of files: 1
- file 0 => global file 1
Number of expressions: 0
Number of file 0 mappings: 13
Number of file 0 mappings: 11
- Code(Zero) at (prev + 25, 23) to (start + 1, 12)
- Code(Zero) at (prev + 2, 9) to (start + 0, 10)
- Code(Zero) at (prev + 0, 14) to (start + 0, 17)
- Code(Zero) at (prev + 0, 18) to (start + 0, 23)
- Code(Zero) at (prev + 0, 14) to (start + 0, 23)
- Code(Zero) at (prev + 0, 27) to (start + 0, 28)
- Code(Zero) at (prev + 0, 32) to (start + 0, 34)
- Code(Zero) at (prev + 1, 9) to (start + 0, 10)
- Code(Zero) at (prev + 0, 14) to (start + 0, 17)
- Code(Zero) at (prev + 0, 18) to (start + 0, 23)
- Code(Zero) at (prev + 0, 14) to (start + 0, 23)
- Code(Zero) at (prev + 0, 27) to (start + 0, 28)
- Code(Zero) at (prev + 0, 32) to (start + 0, 34)
- Code(Zero) at (prev + 1, 14) to (start + 0, 16)
@ -120,15 +118,14 @@ Number of file 0 mappings: 1
- Code(Counter(0)) at (prev + 33, 1) to (start + 0, 22)
Function name: async::h::{closure#0} (unused)
Raw bytes (44): 0x[01, 01, 00, 08, 00, 21, 16, 03, 0c, 00, 04, 09, 00, 0a, 00, 00, 0e, 00, 13, 00, 00, 14, 00, 19, 00, 00, 1a, 00, 1b, 00, 00, 20, 00, 22, 00, 01, 0e, 00, 10, 00, 02, 01, 00, 02]
Raw bytes (39): 0x[01, 01, 00, 07, 00, 21, 16, 03, 0c, 00, 04, 09, 00, 0a, 00, 00, 0e, 00, 19, 00, 00, 1a, 00, 1b, 00, 00, 20, 00, 22, 00, 01, 0e, 00, 10, 00, 02, 01, 00, 02]
Number of files: 1
- file 0 => global file 1
Number of expressions: 0
Number of file 0 mappings: 8
Number of file 0 mappings: 7
- Code(Zero) at (prev + 33, 22) to (start + 3, 12)
- Code(Zero) at (prev + 4, 9) to (start + 0, 10)
- Code(Zero) at (prev + 0, 14) to (start + 0, 19)
- Code(Zero) at (prev + 0, 20) to (start + 0, 25)
- Code(Zero) at (prev + 0, 14) to (start + 0, 25)
- Code(Zero) at (prev + 0, 26) to (start + 0, 27)
- Code(Zero) at (prev + 0, 32) to (start + 0, 34)
- Code(Zero) at (prev + 1, 14) to (start + 0, 16)
@ -143,28 +140,25 @@ Number of file 0 mappings: 1
- Code(Counter(0)) at (prev + 42, 1) to (start + 0, 19)
Function name: async::i::{closure#0}
Raw bytes (78): 0x[01, 01, 02, 07, 21, 19, 1d, 0e, 01, 2a, 13, 04, 0c, 0d, 05, 09, 00, 0a, 01, 00, 0e, 00, 12, 05, 00, 13, 00, 18, 09, 00, 1c, 00, 21, 0d, 00, 27, 00, 2a, 15, 00, 2b, 00, 30, 1d, 01, 09, 00, 0a, 11, 00, 0e, 00, 11, 25, 00, 12, 00, 17, 29, 00, 1b, 00, 20, 1d, 00, 24, 00, 26, 21, 01, 0e, 00, 10, 03, 02, 01, 00, 02]
Raw bytes (63): 0x[01, 01, 02, 07, 19, 11, 15, 0b, 01, 2a, 13, 04, 0c, 09, 05, 09, 00, 0a, 01, 00, 0e, 00, 18, 05, 00, 1c, 00, 21, 09, 00, 27, 00, 30, 15, 01, 09, 00, 0a, 0d, 00, 0e, 00, 17, 1d, 00, 1b, 00, 20, 15, 00, 24, 00, 26, 19, 01, 0e, 00, 10, 03, 02, 01, 00, 02]
Number of files: 1
- file 0 => global file 1
Number of expressions: 2
- expression 0 operands: lhs = Expression(1, Add), rhs = Counter(8)
- expression 1 operands: lhs = Counter(6), rhs = Counter(7)
Number of file 0 mappings: 14
- expression 0 operands: lhs = Expression(1, Add), rhs = Counter(6)
- expression 1 operands: lhs = Counter(4), rhs = Counter(5)
Number of file 0 mappings: 11
- Code(Counter(0)) at (prev + 42, 19) to (start + 4, 12)
- Code(Counter(3)) at (prev + 5, 9) to (start + 0, 10)
- Code(Counter(0)) at (prev + 0, 14) to (start + 0, 18)
- Code(Counter(1)) at (prev + 0, 19) to (start + 0, 24)
- Code(Counter(2)) at (prev + 0, 28) to (start + 0, 33)
- Code(Counter(3)) at (prev + 0, 39) to (start + 0, 42)
- Code(Counter(5)) at (prev + 0, 43) to (start + 0, 48)
- Code(Counter(7)) at (prev + 1, 9) to (start + 0, 10)
- Code(Counter(4)) at (prev + 0, 14) to (start + 0, 17)
- Code(Counter(9)) at (prev + 0, 18) to (start + 0, 23)
- Code(Counter(10)) at (prev + 0, 27) to (start + 0, 32)
- Code(Counter(7)) at (prev + 0, 36) to (start + 0, 38)
- Code(Counter(8)) at (prev + 1, 14) to (start + 0, 16)
- Code(Counter(2)) at (prev + 5, 9) to (start + 0, 10)
- Code(Counter(0)) at (prev + 0, 14) to (start + 0, 24)
- Code(Counter(1)) at (prev + 0, 28) to (start + 0, 33)
- Code(Counter(2)) at (prev + 0, 39) to (start + 0, 48)
- Code(Counter(5)) at (prev + 1, 9) to (start + 0, 10)
- Code(Counter(3)) at (prev + 0, 14) to (start + 0, 23)
- Code(Counter(7)) at (prev + 0, 27) to (start + 0, 32)
- Code(Counter(5)) at (prev + 0, 36) to (start + 0, 38)
- Code(Counter(6)) at (prev + 1, 14) to (start + 0, 16)
- Code(Expression(0, Add)) at (prev + 2, 1) to (start + 0, 2)
= ((c6 + c7) + c8)
= ((c4 + c5) + c6)
Function name: async::j
Raw bytes (58): 0x[01, 01, 02, 07, 0d, 05, 09, 0a, 01, 35, 01, 00, 0d, 01, 0b, 0b, 00, 0c, 05, 01, 09, 00, 0a, 01, 00, 0e, 00, 1b, 05, 00, 1f, 00, 27, 09, 01, 09, 00, 0a, 11, 00, 0e, 00, 1a, 09, 00, 1e, 00, 20, 0d, 01, 0e, 00, 10, 03, 02, 01, 00, 02]

4
tests/coverage/async.coverage
View File

@ -45,9 +45,9 @@
LL| 1| // executed asynchronously.
LL| 1| match x {
LL| 1| y if c(x).await == y + 1 => { d().await; }
^0 ^0 ^0 ^0
^0 ^0
LL| 1| y if f().await == y + 1 => (),
^0 ^0 ^0
^0 ^0
LL| 1| _ => (),
LL| | }
LL| 1|}

25
tests/coverage/await_ready.cov-map Normal file
View File

@ -0,0 +1,25 @@
Function name: await_ready::await_ready
Raw bytes (9): 0x[01, 01, 00, 01, 01, 0a, 01, 00, 1e]
Number of files: 1
- file 0 => global file 1
Number of expressions: 0
Number of file 0 mappings: 1
- Code(Counter(0)) at (prev + 10, 1) to (start + 0, 30)
Function name: await_ready::await_ready::{closure#0}
Raw bytes (14): 0x[01, 01, 00, 02, 01, 0a, 1e, 03, 0f, 05, 04, 01, 00, 02]
Number of files: 1
- file 0 => global file 1
Number of expressions: 0
Number of file 0 mappings: 2
- Code(Counter(0)) at (prev + 10, 30) to (start + 3, 15)
- Code(Counter(1)) at (prev + 4, 1) to (start + 0, 2)
Function name: await_ready::main
Raw bytes (9): 0x[01, 01, 00, 01, 01, 10, 01, 03, 02]
Number of files: 1
- file 0 => global file 1
Number of expressions: 0
Number of file 0 mappings: 1
- Code(Counter(0)) at (prev + 16, 1) to (start + 3, 2)

38
tests/coverage/await_ready.coverage Normal file
View File

@ -0,0 +1,38 @@
LL| |#![feature(coverage_attribute)]
LL| |#![feature(custom_inner_attributes)] // for #![rustfmt::skip]
LL| |#![feature(noop_waker)]
LL| |#![rustfmt::skip]
LL| |//@ edition: 2021
LL| |
LL| |#[coverage(off)]
LL| |async fn ready() -> u8 { 1 }
LL| |
LL| 1|async fn await_ready() -> u8 {
LL| 1| // await should be covered even if the function never yields
LL| 1| ready()
LL| 1| .await
LL| 1|}
LL| |
LL| 1|fn main() {
LL| 1| let mut future = Box::pin(await_ready());
LL| 1| executor::block_on(future.as_mut());
LL| 1|}
LL| |
LL| |mod executor {
LL| | use core::future::Future;
LL| | use core::pin::pin;
LL| | use core::task::{Context, Poll, Waker};
LL| |
LL| | #[coverage(off)]
LL| | pub fn block_on<F: Future>(mut future: F) -> F::Output {
LL| | let mut future = pin!(future);
LL| | let mut context = Context::from_waker(Waker::noop());
LL| |
LL| | loop {
LL| | if let Poll::Ready(val) = future.as_mut().poll(&mut context) {
LL| | break val;
LL| | }
LL| | }
LL| | }
LL| |}

37
tests/coverage/await_ready.rs Normal file
View File

@ -0,0 +1,37 @@
#![feature(coverage_attribute)]
#![feature(custom_inner_attributes)] // for #![rustfmt::skip]
#![feature(noop_waker)]
#![rustfmt::skip]
//@ edition: 2021
#[coverage(off)]
async fn ready() -> u8 { 1 }
async fn await_ready() -> u8 {
// await should be covered even if the function never yields
ready()
.await
}
fn main() {
let mut future = Box::pin(await_ready());
executor::block_on(future.as_mut());
}
mod executor {
use core::future::Future;
use core::pin::pin;
use core::task::{Context, Poll, Waker};
#[coverage(off)]
pub fn block_on<F: Future>(mut future: F) -> F::Output {
let mut future = pin!(future);
let mut context = Context::from_waker(Waker::noop());
loop {
if let Poll::Ready(val) = future.as_mut().poll(&mut context) {
break val;
}
}
}
}

13
tests/ui/implied-bounds/implied-bounds-on-nested-references-plus-variance-2.rs Normal file
View File

@ -0,0 +1,13 @@
//@ check-pass
//@ known-bug: #25860
static UNIT: &'static &'static () = &&();
fn foo<'a, 'b, T>(_: &'a &'b (), v: &'b T, _: &()) -> &'a T { v }
fn bad<'a, T>(x: &'a T) -> &'static T {
let f: fn(_, &'a T, &()) -> &'static T = foo;
f(UNIT, x, &())
}
fn main() {}

13
tests/ui/implied-bounds/implied-bounds-on-nested-references-plus-variance-early-bound.rs Normal file
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@ -0,0 +1,13 @@
// Regression test for #129021.
static UNIT: &'static &'static () = &&();
fn foo<'a: 'a, 'b: 'b, T>(_: &'a &'b (), v: &'b T) -> &'a T { v }
fn bad<'a, T>(x: &'a T) -> &'static T {
let f: fn(_, &'a T) -> &'static T = foo;
//~^ ERROR lifetime may not live long enough
f(UNIT, x)
}
fn main() {}

10
tests/ui/implied-bounds/implied-bounds-on-nested-references-plus-variance-early-bound.stderr Normal file
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@ -0,0 +1,10 @@
error: lifetime may not live long enough
--> $DIR/implied-bounds-on-nested-references-plus-variance-early-bound.rs:8:12
|
LL | fn bad<'a, T>(x: &'a T) -> &'static T {
| -- lifetime `'a` defined here
LL | let f: fn(_, &'a T) -> &'static T = foo;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'static`
error: aborting due to 1 previous error

19
tests/ui/implied-bounds/implied-bounds-on-nested-references-plus-variance-unnormalized.rs Normal file
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@ -0,0 +1,19 @@
// Regression test for #129021.
trait ToArg<T> {
type Arg;
}
impl<T, U> ToArg<T> for U {
type Arg = T;
}
fn extend_inner<'a, 'b>(x: &'a str) -> <&'b &'a () as ToArg<&'b str>>::Arg { x }
fn extend<'a, 'b>(x: &'a str) -> &'b str {
(extend_inner as fn(_) -> _)(x)
//~^ ERROR lifetime may not live long enough
}
fn main() {
let y = extend(&String::from("Hello World"));
println!("{}", y);
}

14
tests/ui/implied-bounds/implied-bounds-on-nested-references-plus-variance-unnormalized.stderr Normal file
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@ -0,0 +1,14 @@
error: lifetime may not live long enough
--> $DIR/implied-bounds-on-nested-references-plus-variance-unnormalized.rs:12:5
|
LL | fn extend<'a, 'b>(x: &'a str) -> &'b str {
| -- -- lifetime `'b` defined here
| |
| lifetime `'a` defined here
LL | (extend_inner as fn(_) -> _)(x)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ function was supposed to return data with lifetime `'b` but it is returning data with lifetime `'a`
|
= help: consider adding the following bound: `'a: 'b`
error: aborting due to 1 previous error

7
tests/ui/implied-bounds/implied-bounds-on-nested-references-plus-variance.rs
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@ -1,8 +1,4 @@
//@ check-pass
//@ known-bug: #25860
// Should fail. The combination of variance and implied bounds for nested
// references allows us to infer a longer lifetime than we can prove.
// Regression test for #129021.
static UNIT: &'static &'static () = &&();
@ -10,6 +6,7 @@ fn foo<'a, 'b, T>(_: &'a &'b (), v: &'b T) -> &'a T { v }
fn bad<'a, T>(x: &'a T) -> &'static T {
let f: fn(_, &'a T) -> &'static T = foo;
//~^ ERROR lifetime may not live long enough
f(UNIT, x)
}

10
tests/ui/implied-bounds/implied-bounds-on-nested-references-plus-variance.stderr Normal file
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@ -0,0 +1,10 @@
error: lifetime may not live long enough
--> $DIR/implied-bounds-on-nested-references-plus-variance.rs:8:12
|
LL | fn bad<'a, T>(x: &'a T) -> &'static T {
| -- lifetime `'a` defined here
LL | let f: fn(_, &'a T) -> &'static T = foo;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'static`
error: aborting due to 1 previous error