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Auto merge of #78779 - LeSeulArtichaut:ty-visitor-return, r=oli-obk

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Introduce `TypeVisitor::BreakTy`

Implements MCP rust-lang/compiler-team#383.
r? `@ghost`
cc `@lcnr` `@oli-obk`

~~Blocked on FCP in rust-lang/compiler-team#383.~~
This commit is contained in:
bors 2020-11-17 12:24:34 +00:00
commit e0ef0fc392
32 changed files with 232 additions and 213 deletions
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2
compiler/rustc_infer/src/infer/error_reporting/mod.rs
View File

@ -1498,7 +1498,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
}
impl<'tcx> ty::fold::TypeVisitor<'tcx> for OpaqueTypesVisitor<'tcx> {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<()> {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
if let Some((kind, def_id)) = TyCategory::from_ty(t) {
let span = self.tcx.def_span(def_id);
// Avoid cluttering the output when the "found" and error span overlap:

2
compiler/rustc_infer/src/infer/error_reporting/nice_region_error/static_impl_trait.rs
View File

@ -474,7 +474,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
struct TraitObjectVisitor(Vec<DefId>);
impl TypeVisitor<'_> for TraitObjectVisitor {
fn visit_ty(&mut self, t: Ty<'_>) -> ControlFlow<()> {
fn visit_ty(&mut self, t: Ty<'_>) -> ControlFlow<Self::BreakTy> {
match t.kind() {
ty::Dynamic(preds, RegionKind::ReStatic) => {
if let Some(def_id) = preds.principal_def_id() {

6
compiler/rustc_infer/src/infer/mod.rs
View File

@ -1,5 +1,3 @@
//! See the Book for more information.
pub use self::freshen::TypeFreshener;
pub use self::LateBoundRegionConversionTime::*;
pub use self::RegionVariableOrigin::*;
@ -1334,9 +1332,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
where
T: TypeFoldable<'tcx>,
{
let mut r = resolve::UnresolvedTypeFinder::new(self);
value.visit_with(&mut r);
r.first_unresolved
value.visit_with(&mut resolve::UnresolvedTypeFinder::new(self)).break_value()
}
pub fn probe_const_var(

7
compiler/rustc_infer/src/infer/nll_relate/mod.rs
View File

@ -741,7 +741,10 @@ struct ScopeInstantiator<'me, 'tcx> {
}
impl<'me, 'tcx> TypeVisitor<'tcx> for ScopeInstantiator<'me, 'tcx> {
fn visit_binder<T: TypeFoldable<'tcx>>(&mut self, t: &ty::Binder<T>) -> ControlFlow<()> {
fn visit_binder<T: TypeFoldable<'tcx>>(
&mut self,
t: &ty::Binder<T>,
) -> ControlFlow<Self::BreakTy> {
self.target_index.shift_in(1);
t.super_visit_with(self);
self.target_index.shift_out(1);
@ -749,7 +752,7 @@ impl<'me, 'tcx> TypeVisitor<'tcx> for ScopeInstantiator<'me, 'tcx> {
ControlFlow::CONTINUE
}
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<()> {
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
let ScopeInstantiator { bound_region_scope, next_region, .. } = self;
match r {

11
compiler/rustc_infer/src/infer/resolve.rs
View File

@ -111,19 +111,17 @@ impl<'a, 'tcx> TypeFolder<'tcx> for OpportunisticRegionResolver<'a, 'tcx> {
/// involve some hashing and so forth).
pub struct UnresolvedTypeFinder<'a, 'tcx> {
infcx: &'a InferCtxt<'a, 'tcx>,
/// Used to find the type parameter name and location for error reporting.
pub first_unresolved: Option<(Ty<'tcx>, Option<Span>)>,
}
impl<'a, 'tcx> UnresolvedTypeFinder<'a, 'tcx> {
pub fn new(infcx: &'a InferCtxt<'a, 'tcx>) -> Self {
UnresolvedTypeFinder { infcx, first_unresolved: None }
UnresolvedTypeFinder { infcx }
}
}
impl<'a, 'tcx> TypeVisitor<'tcx> for UnresolvedTypeFinder<'a, 'tcx> {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<()> {
type BreakTy = (Ty<'tcx>, Option<Span>);
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
let t = self.infcx.shallow_resolve(t);
if t.has_infer_types() {
if let ty::Infer(infer_ty) = *t.kind() {
@ -144,8 +142,7 @@ impl<'a, 'tcx> TypeVisitor<'tcx> for UnresolvedTypeFinder<'a, 'tcx> {
} else {
None
};
self.first_unresolved = Some((t, ty_var_span));
ControlFlow::BREAK
ControlFlow::Break((t, ty_var_span))
} else {
// Otherwise, visit its contents.
t.super_visit_with(self)

2
compiler/rustc_infer/src/traits/structural_impls.rs
View File

@ -69,7 +69,7 @@ impl<'tcx, O: TypeFoldable<'tcx>> TypeFoldable<'tcx> for traits::Obligation<'tcx
}
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.predicate.visit_with(visitor)
}
}

14
compiler/rustc_lint/src/types.rs
View File

@ -1131,16 +1131,14 @@ impl<'a, 'tcx> ImproperCTypesVisitor<'a, 'tcx> {
fn check_for_opaque_ty(&mut self, sp: Span, ty: Ty<'tcx>) -> bool {
struct ProhibitOpaqueTypes<'a, 'tcx> {
cx: &'a LateContext<'tcx>,
ty: Option<Ty<'tcx>>,
};
impl<'a, 'tcx> ty::fold::TypeVisitor<'tcx> for ProhibitOpaqueTypes<'a, 'tcx> {
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<()> {
type BreakTy = Ty<'tcx>;
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
match ty.kind() {
ty::Opaque(..) => {
self.ty = Some(ty);
ControlFlow::BREAK
}
ty::Opaque(..) => ControlFlow::Break(ty),
// Consider opaque types within projections FFI-safe if they do not normalize
// to more opaque types.
ty::Projection(..) => {
@ -1159,9 +1157,7 @@ impl<'a, 'tcx> ImproperCTypesVisitor<'a, 'tcx> {
}
}
let mut visitor = ProhibitOpaqueTypes { cx: self.cx, ty: None };
ty.visit_with(&mut visitor);
if let Some(ty) = visitor.ty {
if let Some(ty) = ty.visit_with(&mut ProhibitOpaqueTypes { cx: self.cx }).break_value() {
self.emit_ffi_unsafe_type_lint(ty, sp, "opaque types have no C equivalent", None);
true
} else {

2
compiler/rustc_macros/src/type_foldable.rs
View File

@ -35,7 +35,7 @@ pub fn type_foldable_derive(mut s: synstructure::Structure<'_>) -> proc_macro2::
fn super_visit_with<__F: ::rustc_middle::ty::fold::TypeVisitor<'tcx>>(
&self,
__folder: &mut __F
) -> ::std::ops::ControlFlow<()> {
) -> ::std::ops::ControlFlow<__F::BreakTy> {
match *self { #body_visit }
::std::ops::ControlFlow::CONTINUE
}

1
compiler/rustc_middle/src/lib.rs
View File

@ -51,6 +51,7 @@
#![feature(half_open_range_patterns)]
#![feature(exclusive_range_pattern)]
#![feature(control_flow_enum)]
#![feature(associated_type_defaults)]
#![recursion_limit = "512"]
#[macro_use]

4
compiler/rustc_middle/src/macros.rs
View File

@ -62,7 +62,7 @@ macro_rules! TrivialTypeFoldableImpls {
fn super_visit_with<F: $crate::ty::fold::TypeVisitor<$tcx>>(
&self,
_: &mut F)
-> ::std::ops::ControlFlow<()>
-> ::std::ops::ControlFlow<F::BreakTy>
{
::std::ops::ControlFlow::CONTINUE
}
@ -105,7 +105,7 @@ macro_rules! EnumTypeFoldableImpl {
fn super_visit_with<V: $crate::ty::fold::TypeVisitor<$tcx>>(
&self,
visitor: &mut V,
) -> ::std::ops::ControlFlow<()> {
) -> ::std::ops::ControlFlow<V::BreakTy> {
EnumTypeFoldableImpl!(@VisitVariants(self, visitor) input($($variants)*) output())
}
}

5
compiler/rustc_middle/src/mir/mod.rs
View File

@ -2464,7 +2464,10 @@ impl<'tcx> TypeFoldable<'tcx> for UserTypeProjection {
}
}
fn super_visit_with<Vs: TypeVisitor<'tcx>>(&self, visitor: &mut Vs) -> ControlFlow<()> {
fn super_visit_with<Vs: TypeVisitor<'tcx>>(
&self,
visitor: &mut Vs,
) -> ControlFlow<Vs::BreakTy> {
self.base.visit_with(visitor)
// Note: there's nothing in `self.proj` to visit.
}

25
compiler/rustc_middle/src/mir/type_foldable.rs
View File

@ -87,7 +87,7 @@ impl<'tcx> TypeFoldable<'tcx> for Terminator<'tcx> {
Terminator { source_info: self.source_info, kind }
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
use crate::mir::TerminatorKind::*;
match self.kind {
@ -144,7 +144,7 @@ impl<'tcx> TypeFoldable<'tcx> for GeneratorKind {
self
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
ControlFlow::CONTINUE
}
}
@ -154,7 +154,7 @@ impl<'tcx> TypeFoldable<'tcx> for Place<'tcx> {
Place { local: self.local.fold_with(folder), projection: self.projection.fold_with(folder) }
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.local.visit_with(visitor)?;
self.projection.visit_with(visitor)
}
@ -165,7 +165,7 @@ impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<PlaceElem<'tcx>> {
ty::util::fold_list(self, folder, |tcx, v| tcx.intern_place_elems(v))
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.iter().try_for_each(|t| t.visit_with(visitor))
}
}
@ -211,7 +211,7 @@ impl<'tcx> TypeFoldable<'tcx> for Rvalue<'tcx> {
}
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
use crate::mir::Rvalue::*;
match *self {
Use(ref op) => op.visit_with(visitor),
@ -266,7 +266,7 @@ impl<'tcx> TypeFoldable<'tcx> for Operand<'tcx> {
}
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
match *self {
Operand::Copy(ref place) | Operand::Move(ref place) => place.visit_with(visitor),
Operand::Constant(ref c) => c.visit_with(visitor),
@ -290,7 +290,10 @@ impl<'tcx> TypeFoldable<'tcx> for PlaceElem<'tcx> {
}
}
fn super_visit_with<Vs: TypeVisitor<'tcx>>(&self, visitor: &mut Vs) -> ControlFlow<()> {
fn super_visit_with<Vs: TypeVisitor<'tcx>>(
&self,
visitor: &mut Vs,
) -> ControlFlow<Vs::BreakTy> {
use crate::mir::ProjectionElem::*;
match self {
@ -305,7 +308,7 @@ impl<'tcx> TypeFoldable<'tcx> for Field {
fn super_fold_with<F: TypeFolder<'tcx>>(self, _: &mut F) -> Self {
self
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
ControlFlow::CONTINUE
}
}
@ -314,7 +317,7 @@ impl<'tcx> TypeFoldable<'tcx> for GeneratorSavedLocal {
fn super_fold_with<F: TypeFolder<'tcx>>(self, _: &mut F) -> Self {
self
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
ControlFlow::CONTINUE
}
}
@ -323,7 +326,7 @@ impl<'tcx, R: Idx, C: Idx> TypeFoldable<'tcx> for BitMatrix<R, C> {
fn super_fold_with<F: TypeFolder<'tcx>>(self, _: &mut F) -> Self {
self
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
ControlFlow::CONTINUE
}
}
@ -336,7 +339,7 @@ impl<'tcx> TypeFoldable<'tcx> for Constant<'tcx> {
literal: self.literal.fold_with(folder),
}
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.literal.visit_with(visitor)
}
}

110
compiler/rustc_middle/src/ty/fold.rs
View File

@ -49,8 +49,8 @@ pub trait TypeFoldable<'tcx>: fmt::Debug + Clone {
self.super_fold_with(folder)
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()>;
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy>;
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.super_visit_with(visitor)
}
@ -73,7 +73,7 @@ pub trait TypeFoldable<'tcx>: fmt::Debug + Clone {
}
fn has_type_flags(&self, flags: TypeFlags) -> bool {
self.visit_with(&mut HasTypeFlagsVisitor { flags }).is_break()
self.visit_with(&mut HasTypeFlagsVisitor { flags }).break_value() == Some(FoundFlags)
}
fn has_projections(&self) -> bool {
self.has_type_flags(TypeFlags::HAS_PROJECTION)
@ -142,26 +142,13 @@ pub trait TypeFoldable<'tcx>: fmt::Debug + Clone {
fn still_further_specializable(&self) -> bool {
self.has_type_flags(TypeFlags::STILL_FURTHER_SPECIALIZABLE)
}
/// A visitor that does not recurse into types, works like `fn walk_shallow` in `Ty`.
fn visit_tys_shallow(&self, visit: impl FnMut(Ty<'tcx>) -> ControlFlow<()>) -> ControlFlow<()> {
pub struct Visitor<F>(F);
impl<'tcx, F: FnMut(Ty<'tcx>) -> ControlFlow<()>> TypeVisitor<'tcx> for Visitor<F> {
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<()> {
self.0(ty)
}
}
self.visit_with(&mut Visitor(visit))
}
}
impl TypeFoldable<'tcx> for hir::Constness {
fn super_fold_with<F: TypeFolder<'tcx>>(self, _: &mut F) -> Self {
self
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
ControlFlow::CONTINUE
}
}
@ -195,23 +182,25 @@ pub trait TypeFolder<'tcx>: Sized {
}
pub trait TypeVisitor<'tcx>: Sized {
fn visit_binder<T: TypeFoldable<'tcx>>(&mut self, t: &Binder<T>) -> ControlFlow<()> {
type BreakTy = !;
fn visit_binder<T: TypeFoldable<'tcx>>(&mut self, t: &Binder<T>) -> ControlFlow<Self::BreakTy> {
t.super_visit_with(self)
}
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<()> {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
t.super_visit_with(self)
}
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<()> {
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
r.super_visit_with(self)
}
fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<()> {
fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
c.super_visit_with(self)
}
fn visit_predicate(&mut self, p: ty::Predicate<'tcx>) -> ControlFlow<()> {
fn visit_predicate(&mut self, p: ty::Predicate<'tcx>) -> ControlFlow<Self::BreakTy> {
p.super_visit_with(self)
}
}
@ -329,14 +318,19 @@ impl<'tcx> TyCtxt<'tcx> {
where
F: FnMut(ty::Region<'tcx>) -> bool,
{
fn visit_binder<T: TypeFoldable<'tcx>>(&mut self, t: &Binder<T>) -> ControlFlow<()> {
type BreakTy = ();
fn visit_binder<T: TypeFoldable<'tcx>>(
&mut self,
t: &Binder<T>,
) -> ControlFlow<Self::BreakTy> {
self.outer_index.shift_in(1);
let result = t.as_ref().skip_binder().visit_with(self);
self.outer_index.shift_out(1);
result
}
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<()> {
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
match *r {
ty::ReLateBound(debruijn, _) if debruijn < self.outer_index => {
ControlFlow::CONTINUE
@ -351,7 +345,7 @@ impl<'tcx> TyCtxt<'tcx> {
}
}
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<()> {
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
// We're only interested in types involving regions
if ty.flags().intersects(TypeFlags::HAS_FREE_REGIONS) {
ty.super_visit_with(self)
@ -809,6 +803,9 @@ where
value.fold_with(&mut Shifter::new(tcx, amount))
}
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
struct FoundEscapingVars;
/// An "escaping var" is a bound var whose binder is not part of `t`. A bound var can be a
/// bound region or a bound type.
///
@ -840,93 +837,114 @@ struct HasEscapingVarsVisitor {
}
impl<'tcx> TypeVisitor<'tcx> for HasEscapingVarsVisitor {
fn visit_binder<T: TypeFoldable<'tcx>>(&mut self, t: &Binder<T>) -> ControlFlow<()> {
type BreakTy = FoundEscapingVars;
fn visit_binder<T: TypeFoldable<'tcx>>(&mut self, t: &Binder<T>) -> ControlFlow<Self::BreakTy> {
self.outer_index.shift_in(1);
let result = t.super_visit_with(self);
self.outer_index.shift_out(1);
result
}
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<()> {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
// If the outer-exclusive-binder is *strictly greater* than
// `outer_index`, that means that `t` contains some content
// bound at `outer_index` or above (because
// `outer_exclusive_binder` is always 1 higher than the
// content in `t`). Therefore, `t` has some escaping vars.
if t.outer_exclusive_binder > self.outer_index {
ControlFlow::BREAK
ControlFlow::Break(FoundEscapingVars)
} else {
ControlFlow::CONTINUE
}
}
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<()> {
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
// If the region is bound by `outer_index` or anything outside
// of outer index, then it escapes the binders we have
// visited.
if r.bound_at_or_above_binder(self.outer_index) {
ControlFlow::BREAK
ControlFlow::Break(FoundEscapingVars)
} else {
ControlFlow::CONTINUE
}
}
fn visit_const(&mut self, ct: &'tcx ty::Const<'tcx>) -> ControlFlow<()> {
fn visit_const(&mut self, ct: &'tcx ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
// we don't have a `visit_infer_const` callback, so we have to
// hook in here to catch this case (annoying...), but
// otherwise we do want to remember to visit the rest of the
// const, as it has types/regions embedded in a lot of other
// places.
match ct.val {
ty::ConstKind::Bound(debruijn, _) if debruijn >= self.outer_index => ControlFlow::BREAK,
ty::ConstKind::Bound(debruijn, _) if debruijn >= self.outer_index => {
ControlFlow::Break(FoundEscapingVars)
}
_ => ct.super_visit_with(self),
}
}
fn visit_predicate(&mut self, predicate: ty::Predicate<'tcx>) -> ControlFlow<()> {
fn visit_predicate(&mut self, predicate: ty::Predicate<'tcx>) -> ControlFlow<Self::BreakTy> {
if predicate.inner.outer_exclusive_binder > self.outer_index {
ControlFlow::BREAK
ControlFlow::Break(FoundEscapingVars)
} else {
ControlFlow::CONTINUE
}
}
}
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
struct FoundFlags;
// FIXME: Optimize for checking for infer flags
struct HasTypeFlagsVisitor {
flags: ty::TypeFlags,
}
impl<'tcx> TypeVisitor<'tcx> for HasTypeFlagsVisitor {
fn visit_ty(&mut self, t: Ty<'_>) -> ControlFlow<()> {
type BreakTy = FoundFlags;
fn visit_ty(&mut self, t: Ty<'_>) -> ControlFlow<Self::BreakTy> {
debug!(
"HasTypeFlagsVisitor: t={:?} t.flags={:?} self.flags={:?}",
t,
t.flags(),
self.flags
);
if t.flags().intersects(self.flags) { ControlFlow::BREAK } else { ControlFlow::CONTINUE }
if t.flags().intersects(self.flags) {
ControlFlow::Break(FoundFlags)
} else {
ControlFlow::CONTINUE
}
}
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<()> {
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
let flags = r.type_flags();
debug!("HasTypeFlagsVisitor: r={:?} r.flags={:?} self.flags={:?}", r, flags, self.flags);
if flags.intersects(self.flags) { ControlFlow::BREAK } else { ControlFlow::CONTINUE }
if flags.intersects(self.flags) {
ControlFlow::Break(FoundFlags)
} else {
ControlFlow::CONTINUE
}
}
fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<()> {
fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
let flags = FlagComputation::for_const(c);
debug!("HasTypeFlagsVisitor: c={:?} c.flags={:?} self.flags={:?}", c, flags, self.flags);
if flags.intersects(self.flags) { ControlFlow::BREAK } else { ControlFlow::CONTINUE }
if flags.intersects(self.flags) {
ControlFlow::Break(FoundFlags)
} else {
ControlFlow::CONTINUE
}
}
fn visit_predicate(&mut self, predicate: ty::Predicate<'tcx>) -> ControlFlow<()> {
fn visit_predicate(&mut self, predicate: ty::Predicate<'tcx>) -> ControlFlow<Self::BreakTy> {
debug!(
"HasTypeFlagsVisitor: predicate={:?} predicate.flags={:?} self.flags={:?}",
predicate, predicate.inner.flags, self.flags
);
if predicate.inner.flags.intersects(self.flags) {
ControlFlow::BREAK
ControlFlow::Break(FoundFlags)
} else {
ControlFlow::CONTINUE
}
@ -960,14 +978,14 @@ impl LateBoundRegionsCollector {
}
impl<'tcx> TypeVisitor<'tcx> for LateBoundRegionsCollector {
fn visit_binder<T: TypeFoldable<'tcx>>(&mut self, t: &Binder<T>) -> ControlFlow<()> {
fn visit_binder<T: TypeFoldable<'tcx>>(&mut self, t: &Binder<T>) -> ControlFlow<Self::BreakTy> {
self.current_index.shift_in(1);
let result = t.super_visit_with(self);
self.current_index.shift_out(1);
result
}
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<()> {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
// if we are only looking for "constrained" region, we have to
// ignore the inputs to a projection, as they may not appear
// in the normalized form
@ -980,7 +998,7 @@ impl<'tcx> TypeVisitor<'tcx> for LateBoundRegionsCollector {
t.super_visit_with(self)
}
fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<()> {
fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
// if we are only looking for "constrained" region, we have to
// ignore the inputs of an unevaluated const, as they may not appear
// in the normalized form
@ -993,7 +1011,7 @@ impl<'tcx> TypeVisitor<'tcx> for LateBoundRegionsCollector {
c.super_visit_with(self)
}
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<()> {
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
if let ty::ReLateBound(debruijn, br) = *r {
if debruijn == self.current_index {
self.regions.insert(br);

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

@ -1849,7 +1849,7 @@ impl<'tcx> TypeFoldable<'tcx> for ParamEnv<'tcx> {
ParamEnv::new(self.caller_bounds().fold_with(folder), self.reveal().fold_with(folder))
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.caller_bounds().visit_with(visitor)?;
self.reveal().visit_with(visitor)
}

2
compiler/rustc_middle/src/ty/print/pretty.rs
View File

@ -1796,7 +1796,7 @@ impl<F: fmt::Write> FmtPrinter<'_, 'tcx, F> {
{
struct LateBoundRegionNameCollector<'a>(&'a mut FxHashSet<Symbol>);
impl<'tcx> ty::fold::TypeVisitor<'tcx> for LateBoundRegionNameCollector<'_> {
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<()> {
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
if let ty::ReLateBound(_, ty::BrNamed(_, name)) = *r {
self.0.insert(name);
}

54
compiler/rustc_middle/src/ty/structural_impls.rs
View File

@ -729,7 +729,7 @@ impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::AdtDef {
self
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> ControlFlow<V::BreakTy> {
ControlFlow::CONTINUE
}
}
@ -739,7 +739,7 @@ impl<'tcx, T: TypeFoldable<'tcx>, U: TypeFoldable<'tcx>> TypeFoldable<'tcx> for
(self.0.fold_with(folder), self.1.fold_with(folder))
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.0.visit_with(visitor)?;
self.1.visit_with(visitor)
}
@ -752,7 +752,7 @@ impl<'tcx, A: TypeFoldable<'tcx>, B: TypeFoldable<'tcx>, C: TypeFoldable<'tcx>>
(self.0.fold_with(folder), self.1.fold_with(folder), self.2.fold_with(folder))
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.0.visit_with(visitor)?;
self.1.visit_with(visitor)?;
self.2.visit_with(visitor)
@ -779,7 +779,7 @@ impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Rc<T> {
Rc::new((*self).clone().fold_with(folder))
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
(**self).visit_with(visitor)
}
}
@ -790,7 +790,7 @@ impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Arc<T> {
Arc::new((*self).clone().fold_with(folder))
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
(**self).visit_with(visitor)
}
}
@ -800,7 +800,7 @@ impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Box<T> {
self.map_id(|value| value.fold_with(folder))
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
(**self).visit_with(visitor)
}
}
@ -810,7 +810,7 @@ impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Vec<T> {
self.map_id(|t| t.fold_with(folder))
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.iter().try_for_each(|t| t.visit_with(visitor))
}
}
@ -820,7 +820,7 @@ impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Box<[T]> {
self.map_id(|t| t.fold_with(folder))
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.iter().try_for_each(|t| t.visit_with(visitor))
}
}
@ -834,11 +834,11 @@ impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for ty::Binder<T> {
folder.fold_binder(self)
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.as_ref().skip_binder().visit_with(visitor)
}
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
visitor.visit_binder(self)
}
}
@ -848,7 +848,7 @@ impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<ty::ExistentialPredicate<'tcx>>
ty::util::fold_list(self, folder, |tcx, v| tcx.intern_existential_predicates(v))
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.iter().try_for_each(|p| p.visit_with(visitor))
}
}
@ -858,7 +858,7 @@ impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<Ty<'tcx>> {
ty::util::fold_list(self, folder, |tcx, v| tcx.intern_type_list(v))
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.iter().try_for_each(|t| t.visit_with(visitor))
}
}
@ -868,7 +868,7 @@ impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<ProjectionKind> {
ty::util::fold_list(self, folder, |tcx, v| tcx.intern_projs(v))
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.iter().try_for_each(|t| t.visit_with(visitor))
}
}
@ -894,7 +894,7 @@ impl<'tcx> TypeFoldable<'tcx> for ty::instance::Instance<'tcx> {
}
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
use crate::ty::InstanceDef::*;
self.substs.visit_with(visitor)?;
match self.def {
@ -920,7 +920,7 @@ impl<'tcx> TypeFoldable<'tcx> for interpret::GlobalId<'tcx> {
Self { instance: self.instance.fold_with(folder), promoted: self.promoted }
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.instance.visit_with(visitor)
}
}
@ -969,7 +969,7 @@ impl<'tcx> TypeFoldable<'tcx> for Ty<'tcx> {
folder.fold_ty(self)
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
match self.kind() {
ty::RawPtr(ref tm) => tm.visit_with(visitor),
ty::Array(typ, sz) => {
@ -1011,7 +1011,7 @@ impl<'tcx> TypeFoldable<'tcx> for Ty<'tcx> {
}
}
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
visitor.visit_ty(self)
}
}
@ -1025,11 +1025,11 @@ impl<'tcx> TypeFoldable<'tcx> for ty::Region<'tcx> {
folder.fold_region(self)
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> ControlFlow<V::BreakTy> {
ControlFlow::CONTINUE
}
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
visitor.visit_region(*self)
}
}
@ -1040,11 +1040,11 @@ impl<'tcx> TypeFoldable<'tcx> for ty::Predicate<'tcx> {
folder.tcx().reuse_or_mk_predicate(self, new)
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
ty::PredicateKind::super_visit_with(&self.inner.kind, visitor)
}
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
visitor.visit_predicate(*self)
}
@ -1062,7 +1062,7 @@ impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<ty::Predicate<'tcx>> {
ty::util::fold_list(self, folder, |tcx, v| tcx.intern_predicates(v))
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.iter().try_for_each(|p| p.visit_with(visitor))
}
}
@ -1072,7 +1072,7 @@ impl<'tcx, T: TypeFoldable<'tcx>, I: Idx> TypeFoldable<'tcx> for IndexVec<I, T>
self.map_id(|x| x.fold_with(folder))
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.iter().try_for_each(|t| t.visit_with(visitor))
}
}
@ -1092,12 +1092,12 @@ impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::Const<'tcx> {
folder.fold_const(self)
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.ty.visit_with(visitor)?;
self.val.visit_with(visitor)
}
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
visitor.visit_const(self)
}
}
@ -1117,7 +1117,7 @@ impl<'tcx> TypeFoldable<'tcx> for ty::ConstKind<'tcx> {
}
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
match *self {
ty::ConstKind::Infer(ic) => ic.visit_with(visitor),
ty::ConstKind::Param(p) => p.visit_with(visitor),
@ -1135,7 +1135,7 @@ impl<'tcx> TypeFoldable<'tcx> for InferConst<'tcx> {
self
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> ControlFlow<V::BreakTy> {
ControlFlow::CONTINUE
}
}

4
compiler/rustc_middle/src/ty/subst.rs
View File

@ -160,7 +160,7 @@ impl<'tcx> TypeFoldable<'tcx> for GenericArg<'tcx> {
}
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
match self.unpack() {
GenericArgKind::Lifetime(lt) => lt.visit_with(visitor),
GenericArgKind::Type(ty) => ty.visit_with(visitor),
@ -392,7 +392,7 @@ impl<'tcx> TypeFoldable<'tcx> for SubstsRef<'tcx> {
}
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<()> {
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.iter().try_for_each(|t| t.visit_with(visitor))
}
}

6
compiler/rustc_mir/src/interpret/util.rs
View File

@ -18,7 +18,9 @@ where
};
impl<'tcx> TypeVisitor<'tcx> for UsedParamsNeedSubstVisitor<'tcx> {
fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<()> {
type BreakTy = ();
fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
if !c.needs_subst() {
return ControlFlow::CONTINUE;
}
@ -29,7 +31,7 @@ where
}
}
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<()> {
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
if !ty.needs_subst() {
return ControlFlow::CONTINUE;
}

10
compiler/rustc_mir/src/monomorphize/polymorphize.rs
View File

@ -250,7 +250,7 @@ impl<'a, 'tcx> Visitor<'tcx> for MarkUsedGenericParams<'a, 'tcx> {
}
impl<'a, 'tcx> TypeVisitor<'tcx> for MarkUsedGenericParams<'a, 'tcx> {
fn visit_const(&mut self, c: &'tcx Const<'tcx>) -> ControlFlow<()> {
fn visit_const(&mut self, c: &'tcx Const<'tcx>) -> ControlFlow<Self::BreakTy> {
debug!("visit_const: c={:?}", c);
if !c.has_param_types_or_consts() {
return ControlFlow::CONTINUE;
@ -283,7 +283,7 @@ impl<'a, 'tcx> TypeVisitor<'tcx> for MarkUsedGenericParams<'a, 'tcx> {
}
}
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<()> {
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
debug!("visit_ty: ty={:?}", ty);
if !ty.has_param_types_or_consts() {
return ControlFlow::CONTINUE;
@ -318,7 +318,9 @@ struct HasUsedGenericParams<'a> {
}
impl<'a, 'tcx> TypeVisitor<'tcx> for HasUsedGenericParams<'a> {
fn visit_const(&mut self, c: &'tcx Const<'tcx>) -> ControlFlow<()> {
type BreakTy = ();
fn visit_const(&mut self, c: &'tcx Const<'tcx>) -> ControlFlow<Self::BreakTy> {
debug!("visit_const: c={:?}", c);
if !c.has_param_types_or_consts() {
return ControlFlow::CONTINUE;
@ -336,7 +338,7 @@ impl<'a, 'tcx> TypeVisitor<'tcx> for HasUsedGenericParams<'a> {
}
}
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<()> {
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
debug!("visit_ty: ty={:?}", ty);
if !ty.has_param_types_or_consts() {
return ControlFlow::CONTINUE;

2
compiler/rustc_mir/src/util/pretty.rs
View File

@ -640,7 +640,7 @@ pub fn write_allocations<'tcx>(
}
struct CollectAllocIds(BTreeSet<AllocId>);
impl<'tcx> TypeVisitor<'tcx> for CollectAllocIds {
fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<()> {
fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
if let ty::ConstKind::Value(val) = c.val {
self.0.extend(alloc_ids_from_const(val));
}

35
compiler/rustc_privacy/src/lib.rs
View File

@ -4,6 +4,7 @@
#![feature(or_patterns)]
#![feature(control_flow_enum)]
#![feature(try_blocks)]
#![feature(associated_type_defaults)]
#![recursion_limit = "256"]
use rustc_attr as attr;
@ -44,6 +45,8 @@ use std::{cmp, fmt, mem};
/// manually. Second, it doesn't visit some type components like signatures of fn types, or traits
/// in `impl Trait`, see individual comments in `DefIdVisitorSkeleton::visit_ty`.
trait DefIdVisitor<'tcx> {
type BreakTy = ();
fn tcx(&self) -> TyCtxt<'tcx>;
fn shallow(&self) -> bool {
false
@ -56,7 +59,7 @@ trait DefIdVisitor<'tcx> {
def_id: DefId,
kind: &str,
descr: &dyn fmt::Display,
) -> ControlFlow<()>;
) -> ControlFlow<Self::BreakTy>;
/// Not overridden, but used to actually visit types and traits.
fn skeleton(&mut self) -> DefIdVisitorSkeleton<'_, 'tcx, Self> {
@ -66,13 +69,16 @@ trait DefIdVisitor<'tcx> {
dummy: Default::default(),
}
}
fn visit(&mut self, ty_fragment: impl TypeFoldable<'tcx>) -> ControlFlow<()> {
fn visit(&mut self, ty_fragment: impl TypeFoldable<'tcx>) -> ControlFlow<Self::BreakTy> {
ty_fragment.visit_with(&mut self.skeleton())
}
fn visit_trait(&mut self, trait_ref: TraitRef<'tcx>) -> ControlFlow<()> {
fn visit_trait(&mut self, trait_ref: TraitRef<'tcx>) -> ControlFlow<Self::BreakTy> {
self.skeleton().visit_trait(trait_ref)
}
fn visit_predicates(&mut self, predicates: ty::GenericPredicates<'tcx>) -> ControlFlow<()> {
fn visit_predicates(
&mut self,
predicates: ty::GenericPredicates<'tcx>,
) -> ControlFlow<Self::BreakTy> {
self.skeleton().visit_predicates(predicates)
}
}
@ -87,13 +93,13 @@ impl<'tcx, V> DefIdVisitorSkeleton<'_, 'tcx, V>
where
V: DefIdVisitor<'tcx> + ?Sized,
{
fn visit_trait(&mut self, trait_ref: TraitRef<'tcx>) -> ControlFlow<()> {
fn visit_trait(&mut self, trait_ref: TraitRef<'tcx>) -> ControlFlow<V::BreakTy> {
let TraitRef { def_id, substs } = trait_ref;
self.def_id_visitor.visit_def_id(def_id, "trait", &trait_ref.print_only_trait_path())?;
if self.def_id_visitor.shallow() { ControlFlow::CONTINUE } else { substs.visit_with(self) }
}
fn visit_predicate(&mut self, predicate: ty::Predicate<'tcx>) -> ControlFlow<()> {
fn visit_predicate(&mut self, predicate: ty::Predicate<'tcx>) -> ControlFlow<V::BreakTy> {
match predicate.skip_binders() {
ty::PredicateAtom::Trait(ty::TraitPredicate { trait_ref }, _) => {
self.visit_trait(trait_ref)
@ -119,7 +125,10 @@ where
}
}
fn visit_predicates(&mut self, predicates: ty::GenericPredicates<'tcx>) -> ControlFlow<()> {
fn visit_predicates(
&mut self,
predicates: ty::GenericPredicates<'tcx>,
) -> ControlFlow<V::BreakTy> {
let ty::GenericPredicates { parent: _, predicates } = predicates;
predicates.iter().try_for_each(|&(predicate, _span)| self.visit_predicate(predicate))
}
@ -129,7 +138,9 @@ impl<'tcx, V> TypeVisitor<'tcx> for DefIdVisitorSkeleton<'_, 'tcx, V>
where
V: DefIdVisitor<'tcx> + ?Sized,
{
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<()> {
type BreakTy = V::BreakTy;
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<V::BreakTy> {
let tcx = self.def_id_visitor.tcx();
// InternalSubsts are not visited here because they are visited below in `super_visit_with`.
match *ty.kind() {
@ -283,7 +294,7 @@ impl<'a, 'tcx, VL: VisibilityLike> DefIdVisitor<'tcx> for FindMin<'a, 'tcx, VL>
def_id: DefId,
_kind: &str,
_descr: &dyn fmt::Display,
) -> ControlFlow<()> {
) -> ControlFlow<Self::BreakTy> {
self.min = VL::new_min(self, def_id);
ControlFlow::CONTINUE
}
@ -902,7 +913,7 @@ impl DefIdVisitor<'tcx> for ReachEverythingInTheInterfaceVisitor<'_, 'tcx> {
def_id: DefId,
_kind: &str,
_descr: &dyn fmt::Display,
) -> ControlFlow<()> {
) -> ControlFlow<Self::BreakTy> {
if let Some(def_id) = def_id.as_local() {
if let (ty::Visibility::Public, _) | (_, Some(AccessLevel::ReachableFromImplTrait)) =
(self.tcx().visibility(def_id.to_def_id()), self.access_level)
@ -1299,7 +1310,7 @@ impl DefIdVisitor<'tcx> for TypePrivacyVisitor<'tcx> {
def_id: DefId,
kind: &str,
descr: &dyn fmt::Display,
) -> ControlFlow<()> {
) -> ControlFlow<Self::BreakTy> {
if self.check_def_id(def_id, kind, descr) {
ControlFlow::BREAK
} else {
@ -1799,7 +1810,7 @@ impl DefIdVisitor<'tcx> for SearchInterfaceForPrivateItemsVisitor<'tcx> {
def_id: DefId,
kind: &str,
descr: &dyn fmt::Display,
) -> ControlFlow<()> {
) -> ControlFlow<Self::BreakTy> {
if self.check_def_id(def_id, kind, descr) {
ControlFlow::BREAK
} else {

9
compiler/rustc_trait_selection/src/opaque_types.rs
View File

@ -692,12 +692,15 @@ impl<'tcx, OP> TypeVisitor<'tcx> for ConstrainOpaqueTypeRegionVisitor<OP>
where
OP: FnMut(ty::Region<'tcx>),
{
fn visit_binder<T: TypeFoldable<'tcx>>(&mut self, t: &ty::Binder<T>) -> ControlFlow<()> {
fn visit_binder<T: TypeFoldable<'tcx>>(
&mut self,
t: &ty::Binder<T>,
) -> ControlFlow<Self::BreakTy> {
t.as_ref().skip_binder().visit_with(self);
ControlFlow::CONTINUE
}
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<()> {
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
match *r {
// ignore bound regions, keep visiting
ty::ReLateBound(_, _) => ControlFlow::CONTINUE,
@ -708,7 +711,7 @@ where
}
}
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<()> {
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
// We're only interested in types involving regions
if !ty.flags().intersects(ty::TypeFlags::HAS_FREE_REGIONS) {
return ControlFlow::CONTINUE;

14
compiler/rustc_trait_selection/src/traits/const_evaluatable.rs
View File

@ -78,7 +78,7 @@ pub fn is_const_evaluatable<'cx, 'tcx>(
Concrete,
}
let mut failure_kind = FailureKind::Concrete;
walk_abstract_const(tcx, ct, |node| match node {
walk_abstract_const::<!, _>(tcx, ct, |node| match node {
Node::Leaf(leaf) => {
let leaf = leaf.subst(tcx, ct.substs);
if leaf.has_infer_types_or_consts() {
@ -574,19 +574,19 @@ pub(super) fn try_unify_abstract_consts<'tcx>(
// on `ErrorReported`.
}
pub fn walk_abstract_const<'tcx, F>(
pub fn walk_abstract_const<'tcx, R, F>(
tcx: TyCtxt<'tcx>,
ct: AbstractConst<'tcx>,
mut f: F,
) -> ControlFlow<()>
) -> ControlFlow<R>
where
F: FnMut(Node<'tcx>) -> ControlFlow<()>,
F: FnMut(Node<'tcx>) -> ControlFlow<R>,
{
fn recurse<'tcx>(
fn recurse<'tcx, R>(
tcx: TyCtxt<'tcx>,
ct: AbstractConst<'tcx>,
f: &mut dyn FnMut(Node<'tcx>) -> ControlFlow<()>,
) -> ControlFlow<()> {
f: &mut dyn FnMut(Node<'tcx>) -> ControlFlow<R>,
) -> ControlFlow<R> {
let root = ct.root();
f(root)?;
match root {

8
compiler/rustc_trait_selection/src/traits/object_safety.rs
View File

@ -771,7 +771,9 @@ fn contains_illegal_self_type_reference<'tcx, T: TypeFoldable<'tcx>>(
}
impl<'tcx> TypeVisitor<'tcx> for IllegalSelfTypeVisitor<'tcx> {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<()> {
type BreakTy = ();
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
match t.kind() {
ty::Param(_) => {
if t == self.tcx.types.self_param {
@ -812,7 +814,7 @@ fn contains_illegal_self_type_reference<'tcx, T: TypeFoldable<'tcx>>(
}
}
fn visit_const(&mut self, ct: &ty::Const<'tcx>) -> ControlFlow<()> {
fn visit_const(&mut self, ct: &ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
// First check if the type of this constant references `Self`.
self.visit_ty(ct.ty)?;
@ -844,7 +846,7 @@ fn contains_illegal_self_type_reference<'tcx, T: TypeFoldable<'tcx>>(
}
}
fn visit_predicate(&mut self, pred: ty::Predicate<'tcx>) -> ControlFlow<()> {
fn visit_predicate(&mut self, pred: ty::Predicate<'tcx>) -> ControlFlow<Self::BreakTy> {
if let ty::PredicateAtom::ConstEvaluatable(def, substs) = pred.skip_binders() {
// FIXME(const_evaluatable_checked): We should probably deduplicate the logic for
// `AbstractConst`s here, it might make sense to change `ConstEvaluatable` to

53
compiler/rustc_trait_selection/src/traits/structural_match.rs
View File

@ -55,9 +55,7 @@ pub fn search_for_structural_match_violation<'tcx>(
) -> Option<NonStructuralMatchTy<'tcx>> {
// FIXME: we should instead pass in an `infcx` from the outside.
tcx.infer_ctxt().enter(|infcx| {
let mut search = Search { infcx, span, found: None, seen: FxHashSet::default() };
ty.visit_with(&mut search);
search.found
ty.visit_with(&mut Search { infcx, span, seen: FxHashSet::default() }).break_value()
})
}
@ -116,9 +114,6 @@ struct Search<'a, 'tcx> {
infcx: InferCtxt<'a, 'tcx>,
/// Records first ADT that does not implement a structural-match trait.
found: Option<NonStructuralMatchTy<'tcx>>,
/// Tracks ADTs previously encountered during search, so that
/// we will not recur on them again.
seen: FxHashSet<hir::def_id::DefId>,
@ -135,38 +130,33 @@ impl Search<'a, 'tcx> {
}
impl<'a, 'tcx> TypeVisitor<'tcx> for Search<'a, 'tcx> {
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<()> {
type BreakTy = NonStructuralMatchTy<'tcx>;
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
debug!("Search visiting ty: {:?}", ty);
let (adt_def, substs) = match *ty.kind() {
ty::Adt(adt_def, substs) => (adt_def, substs),
ty::Param(_) => {
self.found = Some(NonStructuralMatchTy::Param);
return ControlFlow::BREAK;
return ControlFlow::Break(NonStructuralMatchTy::Param);
}
ty::Dynamic(..) => {
self.found = Some(NonStructuralMatchTy::Dynamic);
return ControlFlow::BREAK;
return ControlFlow::Break(NonStructuralMatchTy::Dynamic);
}
ty::Foreign(_) => {
self.found = Some(NonStructuralMatchTy::Foreign);
return ControlFlow::BREAK;
return ControlFlow::Break(NonStructuralMatchTy::Foreign);
}
ty::Opaque(..) => {
self.found = Some(NonStructuralMatchTy::Opaque);
return ControlFlow::BREAK;
return ControlFlow::Break(NonStructuralMatchTy::Opaque);
}
ty::Projection(..) => {
self.found = Some(NonStructuralMatchTy::Projection);
return ControlFlow::BREAK;
return ControlFlow::Break(NonStructuralMatchTy::Projection);
}
ty::Generator(..) | ty::GeneratorWitness(..) => {
self.found = Some(NonStructuralMatchTy::Generator);
return ControlFlow::BREAK;
return ControlFlow::Break(NonStructuralMatchTy::Generator);
}
ty::Closure(..) => {
self.found = Some(NonStructuralMatchTy::Closure);
return ControlFlow::BREAK;
return ControlFlow::Break(NonStructuralMatchTy::Closure);
}
ty::RawPtr(..) => {
// structural-match ignores substructure of
@ -206,8 +196,7 @@ impl<'a, 'tcx> TypeVisitor<'tcx> for Search<'a, 'tcx> {
ty::Array(..) | ty::Slice(_) | ty::Ref(..) | ty::Tuple(..) => {
// First check all contained types and then tell the caller to continue searching.
ty.super_visit_with(self);
return ControlFlow::CONTINUE;
return ty.super_visit_with(self);
}
ty::Infer(_) | ty::Placeholder(_) | ty::Bound(..) => {
bug!("unexpected type during structural-match checking: {:?}", ty);
@ -227,8 +216,7 @@ impl<'a, 'tcx> TypeVisitor<'tcx> for Search<'a, 'tcx> {
if !self.type_marked_structural(ty) {
debug!("Search found ty: {:?}", ty);
self.found = Some(NonStructuralMatchTy::Adt(&adt_def));
return ControlFlow::BREAK;
return ControlFlow::Break(NonStructuralMatchTy::Adt(&adt_def));
}
// structural-match does not care about the
@ -244,20 +232,11 @@ impl<'a, 'tcx> TypeVisitor<'tcx> for Search<'a, 'tcx> {
// even though we skip super_visit_with, we must recur on
// fields of ADT.
let tcx = self.tcx();
for field_ty in adt_def.all_fields().map(|field| field.ty(tcx, substs)) {
adt_def.all_fields().map(|field| field.ty(tcx, substs)).try_for_each(|field_ty| {
let ty = self.tcx().normalize_erasing_regions(ty::ParamEnv::empty(), field_ty);
debug!("structural-match ADT: field_ty={:?}, ty={:?}", field_ty, ty);
if ty.visit_with(self).is_break() {
// found an ADT without structural-match; halt visiting!
assert!(self.found.is_some());
return ControlFlow::BREAK;
}
}
// Even though we do not want to recur on substs, we do
// want our caller to continue its own search.
ControlFlow::CONTINUE
ty.visit_with(self)
})
}
}

10
compiler/rustc_traits/src/chalk/lowering.rs
View File

@ -859,14 +859,14 @@ impl<'tcx> BoundVarsCollector<'tcx> {
}
impl<'tcx> TypeVisitor<'tcx> for BoundVarsCollector<'tcx> {
fn visit_binder<T: TypeFoldable<'tcx>>(&mut self, t: &Binder<T>) -> ControlFlow<()> {
fn visit_binder<T: TypeFoldable<'tcx>>(&mut self, t: &Binder<T>) -> ControlFlow<Self::BreakTy> {
self.binder_index.shift_in(1);
let result = t.super_visit_with(self);
self.binder_index.shift_out(1);
result
}
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<()> {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
match *t.kind() {
ty::Bound(debruijn, bound_ty) if debruijn == self.binder_index => {
match self.parameters.entry(bound_ty.var.as_u32()) {
@ -886,7 +886,7 @@ impl<'tcx> TypeVisitor<'tcx> for BoundVarsCollector<'tcx> {
t.super_visit_with(self)
}
fn visit_region(&mut self, r: Region<'tcx>) -> ControlFlow<()> {
fn visit_region(&mut self, r: Region<'tcx>) -> ControlFlow<Self::BreakTy> {
match r {
ty::ReLateBound(index, br) if *index == self.binder_index => match br {
ty::BoundRegion::BrNamed(def_id, _name) => {
@ -1076,7 +1076,7 @@ impl PlaceholdersCollector {
}
impl<'tcx> TypeVisitor<'tcx> for PlaceholdersCollector {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<()> {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
match t.kind() {
ty::Placeholder(p) if p.universe == self.universe_index => {
self.next_ty_placeholder = self.next_ty_placeholder.max(p.name.as_usize() + 1);
@ -1088,7 +1088,7 @@ impl<'tcx> TypeVisitor<'tcx> for PlaceholdersCollector {
t.super_visit_with(self)
}
fn visit_region(&mut self, r: Region<'tcx>) -> ControlFlow<()> {
fn visit_region(&mut self, r: Region<'tcx>) -> ControlFlow<Self::BreakTy> {
match r {
ty::RePlaceholder(p) if p.universe == self.universe_index => {
if let ty::BoundRegion::BrAnon(anon) = p.name {

23
compiler/rustc_typeck/src/check/check.rs
View File

@ -446,24 +446,24 @@ pub(super) fn check_opaque_for_inheriting_lifetimes(
struct ProhibitOpaqueVisitor<'tcx> {
opaque_identity_ty: Ty<'tcx>,
generics: &'tcx ty::Generics,
ty: Option<Ty<'tcx>>,
};
impl<'tcx> ty::fold::TypeVisitor<'tcx> for ProhibitOpaqueVisitor<'tcx> {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<()> {
type BreakTy = Option<Ty<'tcx>>;
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
debug!("check_opaque_for_inheriting_lifetimes: (visit_ty) t={:?}", t);
if t != self.opaque_identity_ty && t.super_visit_with(self).is_break() {
self.ty = Some(t);
return ControlFlow::BREAK;
return ControlFlow::Break(Some(t));
}
ControlFlow::CONTINUE
}
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<()> {
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
debug!("check_opaque_for_inheriting_lifetimes: (visit_region) r={:?}", r);
if let RegionKind::ReEarlyBound(ty::EarlyBoundRegion { index, .. }) = r {
if *index < self.generics.parent_count as u32 {
return ControlFlow::BREAK;
return ControlFlow::Break(None);
} else {
return ControlFlow::CONTINUE;
}
@ -472,7 +472,7 @@ pub(super) fn check_opaque_for_inheriting_lifetimes(
r.super_visit_with(self)
}
fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<()> {
fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
if let ty::ConstKind::Unevaluated(..) = c.val {
// FIXME(#72219) We currenctly don't detect lifetimes within substs
// which would violate this check. Even though the particular substitution is not used
@ -494,18 +494,17 @@ pub(super) fn check_opaque_for_inheriting_lifetimes(
InternalSubsts::identity_for_item(tcx, def_id.to_def_id()),
),
generics: tcx.generics_of(def_id),
ty: None,
};
let prohibit_opaque = tcx
.explicit_item_bounds(def_id)
.iter()
.any(|(predicate, _)| predicate.visit_with(&mut visitor).is_break());
.try_for_each(|(predicate, _)| predicate.visit_with(&mut visitor));
debug!(
"check_opaque_for_inheriting_lifetimes: prohibit_opaque={:?}, visitor={:?}",
prohibit_opaque, visitor
);
if prohibit_opaque {
if let Some(ty) = prohibit_opaque.break_value() {
let is_async = match item.kind {
ItemKind::OpaqueTy(hir::OpaqueTy { origin, .. }) => match origin {
hir::OpaqueTyOrigin::AsyncFn => true,
@ -525,7 +524,7 @@ pub(super) fn check_opaque_for_inheriting_lifetimes(
if let Ok(snippet) = tcx.sess.source_map().span_to_snippet(span) {
if snippet == "Self" {
if let Some(ty) = visitor.ty {
if let Some(ty) = ty {
err.span_suggestion(
span,
"consider spelling out the type instead",
@ -1455,7 +1454,7 @@ fn opaque_type_cycle_error(tcx: TyCtxt<'tcx>, def_id: LocalDefId, span: Span) {
{
struct VisitTypes(Vec<DefId>);
impl<'tcx> ty::fold::TypeVisitor<'tcx> for VisitTypes {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<()> {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
match *t.kind() {
ty::Opaque(def, _) => {
self.0.push(def);

2
compiler/rustc_typeck/src/check/op.rs
View File

@ -983,7 +983,7 @@ fn suggest_constraining_param(
struct TypeParamVisitor<'tcx>(Vec<Ty<'tcx>>);
impl<'tcx> TypeVisitor<'tcx> for TypeParamVisitor<'tcx> {
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<()> {
fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
if let ty::Param(_) = ty.kind() {
self.0.push(ty);
}

8
compiler/rustc_typeck/src/check/wfcheck.rs
View File

@ -800,18 +800,20 @@ fn check_where_clauses<'tcx, 'fcx>(
params: FxHashSet<u32>,
}
impl<'tcx> ty::fold::TypeVisitor<'tcx> for CountParams {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<()> {
type BreakTy = ();
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
if let ty::Param(param) = t.kind() {
self.params.insert(param.index);
}
t.super_visit_with(self)
}
fn visit_region(&mut self, _: ty::Region<'tcx>) -> ControlFlow<()> {
fn visit_region(&mut self, _: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
ControlFlow::BREAK
}
fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<()> {
fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
if let ty::ConstKind::Param(param) = c.val {
self.params.insert(param.index);
}

2
compiler/rustc_typeck/src/collect.rs
View File

@ -2062,7 +2062,7 @@ fn const_evaluatable_predicates_of<'tcx>(
}
impl<'a, 'tcx> TypeVisitor<'tcx> for TyAliasVisitor<'a, 'tcx> {
fn visit_const(&mut self, ct: &'tcx Const<'tcx>) -> ControlFlow<()> {
fn visit_const(&mut self, ct: &'tcx Const<'tcx>) -> ControlFlow<Self::BreakTy> {
if let ty::ConstKind::Unevaluated(def, substs, None) = ct.val {
self.preds.insert((
ty::PredicateAtom::ConstEvaluatable(def, substs).to_predicate(self.tcx),

6
compiler/rustc_typeck/src/constrained_generic_params.rs
View File

@ -57,7 +57,7 @@ struct ParameterCollector {
}
impl<'tcx> TypeVisitor<'tcx> for ParameterCollector {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<()> {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
match *t.kind() {
ty::Projection(..) | ty::Opaque(..) if !self.include_nonconstraining => {
// projections are not injective
@ -72,14 +72,14 @@ impl<'tcx> TypeVisitor<'tcx> for ParameterCollector {
t.super_visit_with(self)
}
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<()> {
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
if let ty::ReEarlyBound(data) = *r {
self.parameters.push(Parameter::from(data));
}
ControlFlow::CONTINUE
}
fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<()> {
fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
match c.val {
ty::ConstKind::Unevaluated(..) if !self.include_nonconstraining => {
// Constant expressions are not injective

4
src/tools/clippy/clippy_lints/src/redundant_clone.rs
View File

@ -563,7 +563,9 @@ impl<'a, 'tcx> mir::visit::Visitor<'tcx> for PossibleBorrowerVisitor<'a, 'tcx> {
struct ContainsRegion;
impl TypeVisitor<'_> for ContainsRegion {
fn visit_region(&mut self, _: ty::Region<'_>) -> ControlFlow<()> {
type BreakTy = ();
fn visit_region(&mut self, _: ty::Region<'_>) -> ControlFlow<Self::BreakTy> {
ControlFlow::BREAK
}
}