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Revert "Revert "Rollup merge of #98582 - oli-obk:unconstrained_opaque_type, r=estebank""

Browse source 
This reverts commit 4a742a691e.
This commit is contained in:
Oli Scherer 2022-07-27 11:58:34 +00:00
parent 5d664f7a8f
commit 40e2de8c41
30 changed files with 250 additions and 37 deletions
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4
compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
View file

@ -2146,7 +2146,9 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
}
StorageDeadOrDrop::Destructor(_) => kind,
},
ProjectionElem::Field(..) | ProjectionElem::Downcast(..) => {
ProjectionElem::OpaqueCast { .. }
| ProjectionElem::Field(..)
| ProjectionElem::Downcast(..) => {
match place_ty.ty.kind() {
ty::Adt(def, _) if def.has_dtor(tcx) => {
// Report the outermost adt with a destructor

2
compiler/rustc_borrowck/src/diagnostics/mod.rs
View file

@ -237,6 +237,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
}
ProjectionElem::Downcast(..) if opt.including_downcast => return None,
ProjectionElem::Downcast(..) => (),
ProjectionElem::OpaqueCast(..) => (),
ProjectionElem::Field(field, _ty) => {
// FIXME(project-rfc_2229#36): print capture precisely here.
if let Some(field) = self.is_upvar_field_projection(PlaceRef {
@ -317,6 +318,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
PlaceRef { local, projection: proj_base }.ty(self.body, self.infcx.tcx)
}
ProjectionElem::Downcast(..) => place.ty(self.body, self.infcx.tcx),
ProjectionElem::OpaqueCast(ty) => PlaceTy::from_ty(*ty),
ProjectionElem::Field(_, field_type) => PlaceTy::from_ty(*field_type),
},
};

1
compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
View file

@ -169,6 +169,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
..,
ProjectionElem::Index(_)
| ProjectionElem::ConstantIndex { .. }
| ProjectionElem::OpaqueCast { .. }
| ProjectionElem::Subslice { .. }
| ProjectionElem::Downcast(..),
],

2
compiler/rustc_borrowck/src/lib.rs
View file

@ -1781,6 +1781,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
for (place_base, elem) in place.iter_projections().rev() {
match elem {
ProjectionElem::Index(_/*operand*/) |
ProjectionElem::OpaqueCast(_) |
ProjectionElem::ConstantIndex { .. } |
// assigning to P[i] requires P to be valid.
ProjectionElem::Downcast(_/*adt_def*/, _/*variant_idx*/) =>
@ -2172,6 +2173,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
| ProjectionElem::Index(..)
| ProjectionElem::ConstantIndex { .. }
| ProjectionElem::Subslice { .. }
| ProjectionElem::OpaqueCast { .. }
| ProjectionElem::Downcast(..) => {
let upvar_field_projection = self.is_upvar_field_projection(place);
if let Some(field) = upvar_field_projection {

13
compiler/rustc_borrowck/src/places_conflict.rs
View file

@ -250,6 +250,7 @@ fn place_components_conflict<'tcx>(
| (ProjectionElem::Index { .. }, _, _)
| (ProjectionElem::ConstantIndex { .. }, _, _)
| (ProjectionElem::Subslice { .. }, _, _)
| (ProjectionElem::OpaqueCast { .. }, _, _)
| (ProjectionElem::Downcast { .. }, _, _) => {
// Recursive case. This can still be disjoint on a
// further iteration if this a shallow access and
@ -317,6 +318,17 @@ fn place_projection_conflict<'tcx>(
debug!("place_element_conflict: DISJOINT-OR-EQ-DEREF");
Overlap::EqualOrDisjoint
}
(ProjectionElem::OpaqueCast(v1), ProjectionElem::OpaqueCast(v2)) => {
if v1 == v2 {
// same type - recur.
debug!("place_element_conflict: DISJOINT-OR-EQ-OPAQUE");
Overlap::EqualOrDisjoint
} else {
// Different types. Disjoint!
debug!("place_element_conflict: DISJOINT-OPAQUE");
Overlap::Disjoint
}
}
(ProjectionElem::Field(f1, _), ProjectionElem::Field(f2, _)) => {
if f1 == f2 {
// same field (e.g., `a.y` vs. `a.y`) - recur.
@ -520,6 +532,7 @@ fn place_projection_conflict<'tcx>(
| ProjectionElem::Field(..)
| ProjectionElem::Index(..)
| ProjectionElem::ConstantIndex { .. }
| ProjectionElem::OpaqueCast { .. }
| ProjectionElem::Subslice { .. }
| ProjectionElem::Downcast(..),
_,

1
compiler/rustc_borrowck/src/prefixes.rs
View file

@ -81,6 +81,7 @@ impl<'cx, 'tcx> Iterator for Prefixes<'cx, 'tcx> {
}
ProjectionElem::Downcast(..)
| ProjectionElem::Subslice { .. }
| ProjectionElem::OpaqueCast { .. }
| ProjectionElem::ConstantIndex { .. }
| ProjectionElem::Index(_) => {
cursor = cursor_base;

17
compiler/rustc_borrowck/src/type_check/mod.rs
View file

@ -760,6 +760,19 @@ impl<'a, 'b, 'tcx> TypeVerifier<'a, 'b, 'tcx> {
}
PlaceTy::from_ty(fty)
}
ProjectionElem::OpaqueCast(ty) => {
let ty = self.sanitize_type(place, ty);
let ty = self.cx.normalize(ty, location);
self.cx
.eq_types(
base.ty,
ty,
location.to_locations(),
ConstraintCategory::TypeAnnotation,
)
.unwrap();
PlaceTy::from_ty(ty)
}
}
}
@ -1166,10 +1179,11 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
tcx,
self.param_env,
proj,
|this, field, ()| {
|this, field, _| {
let ty = this.field_ty(tcx, field);
self.normalize(ty, locations)
},
|_, _| unreachable!(),
);
curr_projected_ty = projected_ty;
}
@ -2501,6 +2515,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
}
ProjectionElem::Field(..)
| ProjectionElem::Downcast(..)
| ProjectionElem::OpaqueCast(..)
| ProjectionElem::Index(..)
| ProjectionElem::ConstantIndex { .. }
| ProjectionElem::Subslice { .. } => {

1
compiler/rustc_codegen_cranelift/src/base.rs
View file

@ -850,6 +850,7 @@ pub(crate) fn codegen_place<'tcx>(
PlaceElem::Deref => {
cplace = cplace.place_deref(fx);
}
PlaceElem::OpaqueCast(ty) => cplace = cplace.place_opaque_cast(fx, ty),
PlaceElem::Field(field, _ty) => {
cplace = cplace.place_field(fx, field);
}

8
compiler/rustc_codegen_cranelift/src/value_and_place.rs
View file

@ -621,6 +621,14 @@ impl<'tcx> CPlace<'tcx> {
}
}
pub(crate) fn place_opaque_cast(
self,
fx: &mut FunctionCx<'_, '_, 'tcx>,
ty: Ty<'tcx>,
) -> CPlace<'tcx> {
CPlace { inner: self.inner, layout: fx.layout_of(ty) }
}
pub(crate) fn place_field(
self,
fx: &mut FunctionCx<'_, '_, 'tcx>,

16
compiler/rustc_codegen_ssa/src/mir/place.rs
View file

@ -400,6 +400,21 @@ impl<'a, 'tcx, V: CodegenObject> PlaceRef<'tcx, V> {
downcast
}
pub fn project_type<Bx: BuilderMethods<'a, 'tcx, Value = V>>(
&self,
bx: &mut Bx,
ty: Ty<'tcx>,
) -> Self {
let mut downcast = *self;
downcast.layout = bx.cx().layout_of(ty);
// Cast to the appropriate type.
let variant_ty = bx.cx().backend_type(downcast.layout);
downcast.llval = bx.pointercast(downcast.llval, bx.cx().type_ptr_to(variant_ty));
downcast
}
pub fn storage_live<Bx: BuilderMethods<'a, 'tcx, Value = V>>(&self, bx: &mut Bx) {
bx.lifetime_start(self.llval, self.layout.size);
}
@ -442,6 +457,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
mir::ProjectionElem::Field(ref field, _) => {
cg_base.project_field(bx, field.index())
}
mir::ProjectionElem::OpaqueCast(ty) => cg_base.project_type(bx, ty),
mir::ProjectionElem::Index(index) => {
let index = &mir::Operand::Copy(mir::Place::from(index));
let index = self.codegen_operand(bx, index);

10
compiler/rustc_const_eval/src/interpret/projection.rs
View file

@ -350,6 +350,11 @@ where
) -> InterpResult<'tcx, PlaceTy<'tcx, M::Provenance>> {
use rustc_middle::mir::ProjectionElem::*;
Ok(match proj_elem {
OpaqueCast(ty) => {
let mut place = base.clone();
place.layout = self.layout_of(ty)?;
place
}
Field(field, _) => self.place_field(base, field.index())?,
Downcast(_, variant) => self.place_downcast(base, variant)?,
Deref => self.deref_operand(&self.place_to_op(base)?)?.into(),
@ -374,6 +379,11 @@ where
) -> InterpResult<'tcx, OpTy<'tcx, M::Provenance>> {
use rustc_middle::mir::ProjectionElem::*;
Ok(match proj_elem {
OpaqueCast(ty) => {
let mut op = base.clone();
op.layout = self.layout_of(ty)?;
op
}
Field(field, _) => self.operand_field(base, field.index())?,
Downcast(_, variant) => self.operand_downcast(base, variant)?,
Deref => self.deref_operand(base)?.into(),

1
compiler/rustc_const_eval/src/transform/check_consts/check.rs
View file

@ -656,6 +656,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
ProjectionElem::ConstantIndex { .. }
| ProjectionElem::Downcast(..)
| ProjectionElem::OpaqueCast(..)
| ProjectionElem::Subslice { .. }
| ProjectionElem::Field(..)
| ProjectionElem::Index(_) => {}

1
compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs
View file

@ -308,6 +308,7 @@ where
ProjectionElem::Deref
| ProjectionElem::Field(_, _)
| ProjectionElem::OpaqueCast(_)
| ProjectionElem::ConstantIndex { .. }
| ProjectionElem::Subslice { .. }
| ProjectionElem::Downcast(_, _)

2
compiler/rustc_const_eval/src/transform/promote_consts.rs
View file

@ -361,7 +361,7 @@ impl<'tcx> Validator<'_, 'tcx> {
return Err(Unpromotable);
}
}
ProjectionElem::Downcast(..) => {
ProjectionElem::OpaqueCast(..) | ProjectionElem::Downcast(..) => {
return Err(Unpromotable);
}

8
compiler/rustc_middle/src/mir/mod.rs
View file

@ -1380,6 +1380,7 @@ impl<V, T> ProjectionElem<V, T> {
Self::Field(_, _)
| Self::Index(_)
| Self::OpaqueCast(_)
| Self::ConstantIndex { .. }
| Self::Subslice { .. }
| Self::Downcast(_, _) => false,
@ -1574,7 +1575,9 @@ impl Debug for Place<'_> {
fn fmt(&self, fmt: &mut Formatter<'_>) -> fmt::Result {
for elem in self.projection.iter().rev() {
match elem {
ProjectionElem::Downcast(_, _) | ProjectionElem::Field(_, _) => {
ProjectionElem::OpaqueCast(_)
| ProjectionElem::Downcast(_, _)
| ProjectionElem::Field(_, _) => {
write!(fmt, "(").unwrap();
}
ProjectionElem::Deref => {
@ -1590,6 +1593,9 @@ impl Debug for Place<'_> {
for elem in self.projection.iter() {
match elem {
ProjectionElem::OpaqueCast(ty) => {
write!(fmt, " as {})", ty)?;
}
ProjectionElem::Downcast(Some(name), _index) => {
write!(fmt, " as {})", name)?;
}

7
compiler/rustc_middle/src/mir/syntax.rs
View file

@ -829,6 +829,9 @@ pub type AssertMessage<'tcx> = AssertKind<Operand<'tcx>>;
/// generator has more than one variant, the parent place's variant index must be set, indicating
/// which variant is being used. If it has just one variant, the variant index may or may not be
/// included - the single possible variant is inferred if it is not included.
/// - [`OpaqueCast`](ProjectionElem::OpaqueCast): This projection changes the place's type to the
/// given one, and makes no other changes. A `OpaqueCast` projection on any type other than an
/// opaque type from the current crate is not well-formed.
/// - [`ConstantIndex`](ProjectionElem::ConstantIndex): Computes an offset in units of `T` into the
/// place as described in the documentation for the `ProjectionElem`. The resulting address is
/// the parent's address plus that offset, and the type is `T`. This is only legal if the parent
@ -928,6 +931,10 @@ pub enum ProjectionElem<V, T> {
///
/// The included Symbol is the name of the variant, used for printing MIR.
Downcast(Option<Symbol>, VariantIdx),
/// Like an explicit cast from an opaque type to a concrete type, but without
/// requiring an intermediate variable.
OpaqueCast(T),
}
/// Alias for projections as they appear in places, where the base is a place

4
compiler/rustc_middle/src/mir/tcx.rs
View file

@ -57,7 +57,7 @@ impl<'tcx> PlaceTy<'tcx> {
/// `PlaceElem`, where we can just use the `Ty` that is already
/// stored inline on field projection elems.
pub fn projection_ty(self, tcx: TyCtxt<'tcx>, elem: PlaceElem<'tcx>) -> PlaceTy<'tcx> {
self.projection_ty_core(tcx, ty::ParamEnv::empty(), &elem, |_, _, ty| ty)
self.projection_ty_core(tcx, ty::ParamEnv::empty(), &elem, |_, _, ty| ty, |_, ty| ty)
}
/// `place_ty.projection_ty_core(tcx, elem, |...| { ... })`
@ -71,6 +71,7 @@ impl<'tcx> PlaceTy<'tcx> {
param_env: ty::ParamEnv<'tcx>,
elem: &ProjectionElem<V, T>,
mut handle_field: impl FnMut(&Self, Field, T) -> Ty<'tcx>,
mut handle_opaque_cast: impl FnMut(&Self, T) -> Ty<'tcx>,
) -> PlaceTy<'tcx>
where
V: ::std::fmt::Debug,
@ -109,6 +110,7 @@ impl<'tcx> PlaceTy<'tcx> {
PlaceTy { ty: self.ty, variant_index: Some(index) }
}
ProjectionElem::Field(f, fty) => PlaceTy::from_ty(handle_field(&self, f, fty)),
ProjectionElem::OpaqueCast(ty) => PlaceTy::from_ty(handle_opaque_cast(&self, ty)),
};
debug!("projection_ty self: {:?} elem: {:?} yields: {:?}", self, elem, answer);
answer

7
compiler/rustc_middle/src/mir/visit.rs
View file

@ -1094,6 +1094,11 @@ macro_rules! visit_place_fns {
self.visit_ty(&mut new_ty, TyContext::Location(location));
if ty != new_ty { Some(PlaceElem::Field(field, new_ty)) } else { None }
}
PlaceElem::OpaqueCast(ty) => {
let mut new_ty = ty;
self.visit_ty(&mut new_ty, TyContext::Location(location));
if ty != new_ty { Some(PlaceElem::OpaqueCast(new_ty)) } else { None }
}
PlaceElem::Deref
| PlaceElem::ConstantIndex { .. }
| PlaceElem::Subslice { .. }
@ -1163,7 +1168,7 @@ macro_rules! visit_place_fns {
location: Location,
) {
match elem {
ProjectionElem::Field(_field, ty) => {
ProjectionElem::OpaqueCast(ty) | ProjectionElem::Field(_, ty) => {
self.visit_ty(ty, TyContext::Location(location));
}
ProjectionElem::Index(local) => {

17
compiler/rustc_mir_build/src/build/expr/as_place.rs
View file

@ -102,6 +102,8 @@ fn convert_to_hir_projections_and_truncate_for_capture<'tcx>(
variant = Some(*idx);
continue;
}
// These do not affect anything, they just make sure we know the right type.
ProjectionElem::OpaqueCast(_) => continue,
ProjectionElem::Index(..)
| ProjectionElem::ConstantIndex { .. }
| ProjectionElem::Subslice { .. } => {
@ -168,7 +170,7 @@ fn find_capture_matching_projections<'a, 'tcx>(
/// `PlaceBuilder` now starts from `PlaceBase::Local`.
///
/// Returns a Result with the error being the PlaceBuilder (`from_builder`) that was not found.
#[instrument(level = "trace", skip(cx))]
#[instrument(level = "trace", skip(cx), ret)]
fn to_upvars_resolved_place_builder<'tcx>(
from_builder: PlaceBuilder<'tcx>,
cx: &Builder<'_, 'tcx>,
@ -213,7 +215,6 @@ fn to_upvars_resolved_place_builder<'tcx>(
&capture.captured_place.place.projections,
);
upvar_resolved_place_builder.projection.extend(remaining_projections);
trace!(?upvar_resolved_place_builder);
Ok(upvar_resolved_place_builder)
}
@ -232,16 +233,21 @@ fn strip_prefix<'tcx>(
prefix_projections: &[HirProjection<'tcx>],
) -> impl Iterator<Item = PlaceElem<'tcx>> {
let mut iter = projections.into_iter();
let mut next = || match iter.next()? {
// Filter out opaque casts, they are unnecessary in the prefix.
ProjectionElem::OpaqueCast(..) => iter.next(),
other => Some(other),
};
for projection in prefix_projections {
match projection.kind {
HirProjectionKind::Deref => {
assert!(matches!(iter.next(), Some(ProjectionElem::Deref)));
assert!(matches!(next(), Some(ProjectionElem::Deref)));
}
HirProjectionKind::Field(..) => {
if base_ty.is_enum() {
assert!(matches!(iter.next(), Some(ProjectionElem::Downcast(..))));
assert!(matches!(next(), Some(ProjectionElem::Downcast(..))));
}
assert!(matches!(iter.next(), Some(ProjectionElem::Field(..))));
assert!(matches!(next(), Some(ProjectionElem::Field(..))));
}
HirProjectionKind::Index | HirProjectionKind::Subslice => {
bug!("unexpected projection kind: {:?}", projection);
@ -711,6 +717,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
}
ProjectionElem::Field(..)
| ProjectionElem::Downcast(..)
| ProjectionElem::OpaqueCast(..)
| ProjectionElem::ConstantIndex { .. }
| ProjectionElem::Subslice { .. } => (),
}

7
compiler/rustc_mir_build/src/build/matches/util.rs
View file

@ -95,9 +95,14 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
impl<'pat, 'tcx> MatchPair<'pat, 'tcx> {
pub(in crate::build) fn new(
place: PlaceBuilder<'tcx>,
mut place: PlaceBuilder<'tcx>,
pattern: &'pat Pat<'tcx>,
) -> MatchPair<'pat, 'tcx> {
// Force the place type to the pattern's type.
// FIXME(oli-obk): can we use this to simplify slice/array pattern hacks?
// FIXME(oli-obk): only add this projection if `place` actually had an opaque
// type before the projection.
place = place.project(ProjectionElem::OpaqueCast(pattern.ty));
MatchPair { place, pattern }
}
}

10
compiler/rustc_mir_build/src/thir/pattern/usefulness.rs
View file

@ -842,7 +842,15 @@ fn is_useful<'p, 'tcx>(
}
}
} else {
let ty = v.head().ty();
let mut ty = v.head().ty();
// Opaque types can't get destructured/split, but the patterns can
// actually hint at hidden types, so we use the patterns' types instead.
if let ty::Opaque(..) = ty.kind() {
if let Some(row) = rows.first() {
ty = row.head().ty();
}
}
let is_non_exhaustive = cx.is_foreign_non_exhaustive_enum(ty);
debug!("v.head: {:?}, v.span: {:?}", v.head(), v.head().span());
let pcx = &PatCtxt { cx, ty, span: v.head().span(), is_top_level, is_non_exhaustive };

1
compiler/rustc_mir_dataflow/src/move_paths/abs_domain.rs
View file

@ -48,6 +48,7 @@ impl<'tcx> Lift for PlaceElem<'tcx> {
match *self {
ProjectionElem::Deref => ProjectionElem::Deref,
ProjectionElem::Field(f, ty) => ProjectionElem::Field(f, ty.lift()),
ProjectionElem::OpaqueCast(ty) => ProjectionElem::OpaqueCast(ty.lift()),
ProjectionElem::Index(ref i) => ProjectionElem::Index(i.lift()),
ProjectionElem::Subslice { from, to, from_end } => {
ProjectionElem::Subslice { from, to, from_end }

3
src/test/ui/type-alias-impl-trait/cross_inference_pattern_bug.rs
View file

@ -1,8 +1,9 @@
// compile-flags: --edition=2021
// check-pass
#![feature(type_alias_impl_trait)]
fn main() {
type T = impl Copy; //~ ERROR unconstrained opaque type
type T = impl Copy;
let foo: T = (1u32, 2u32);
let (a, b): (u32, u32) = foo;
}

10
src/test/ui/type-alias-impl-trait/cross_inference_pattern_bug.stderr
View file

@ -1,10 +0,0 @@
error: unconstrained opaque type
--> $DIR/cross_inference_pattern_bug.rs:5:14
|
LL | type T = impl Copy;
| ^^^^^^^^^
|
= note: `T` must be used in combination with a concrete type within the same module
error: aborting due to previous error

6
src/test/ui/type-alias-impl-trait/cross_inference_pattern_bug_no_type.rs
View file

@ -1,13 +1,13 @@
// known-bug: #96572
// compile-flags: --edition=2021 --crate-type=lib
// rustc-env:RUST_BACKTRACE=0
// check-pass
// tracked in https://github.com/rust-lang/rust/issues/96572
#![feature(type_alias_impl_trait)]
fn main() {
type T = impl Copy; // error: unconstrained opaque type
type T = impl Copy;
let foo: T = (1u32, 2u32);
let (a, b) = foo; // removing this line makes the code compile
let (a, b) = foo; // this line used to make the code fail
}

10
src/test/ui/type-alias-impl-trait/cross_inference_pattern_bug_no_type.stderr
View file

@ -1,10 +0,0 @@
error: unconstrained opaque type
--> $DIR/cross_inference_pattern_bug_no_type.rs:10:14
|
LL | type T = impl Copy; // error: unconstrained opaque type
| ^^^^^^^^^
|
= note: `T` must be used in combination with a concrete type within the same module
error: aborting due to previous error

10
src/test/ui/type-alias-impl-trait/issue-96572-unconstrained-mismatch.rs Normal file
View file

@ -0,0 +1,10 @@
#![feature(type_alias_impl_trait)]
fn main() {
type T = impl Copy;
let foo: T = Some((1u32, 2u32));
match foo {
None => (),
Some((a, b, c)) => (), //~ ERROR mismatched types
}
}

15
src/test/ui/type-alias-impl-trait/issue-96572-unconstrained-mismatch.stderr Normal file
View file

@ -0,0 +1,15 @@
error[E0308]: mismatched types
--> $DIR/issue-96572-unconstrained-mismatch.rs:8:14
|
LL | match foo {
| --- this expression has type `T`
LL | None => (),
LL | Some((a, b, c)) => (),
| ^^^^^^^^^ expected a tuple with 2 elements, found one with 3 elements
|
= note: expected tuple `(u32, u32)`
found tuple `(_, _, _)`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.

92
src/test/ui/type-alias-impl-trait/issue-96572-unconstrained.rs Normal file
View file

@ -0,0 +1,92 @@
#![feature(type_alias_impl_trait)]
// check-pass
fn main() {
type T = impl Copy;
let foo: T = Some((1u32, 2u32));
match foo {
None => (),
Some((a, b)) => (),
}
}
fn upvar() {
#[derive(Copy, Clone)]
struct Foo((u32, u32));
type T = impl Copy;
let foo: T = Foo((1u32, 2u32));
let x = move || {
let Foo((a, b)) = foo;
};
}
fn enum_upvar() {
type T = impl Copy;
let foo: T = Some((1u32, 2u32));
let x = move || {
match foo {
None => (),
Some((a, b)) => (),
}
};
}
fn r#struct() {
#[derive(Copy, Clone)]
struct Foo((u32, u32));
type U = impl Copy;
let foo: U = Foo((1u32, 2u32));
let Foo((a, b)) = foo;
}
mod only_pattern {
type T = impl Copy;
fn foo(foo: T) {
let (mut x, mut y) = foo;
x = 42;
y = "foo";
}
type U = impl Copy;
fn bar(bar: Option<U>) {
match bar {
Some((mut x, mut y)) => {
x = 42;
y = "foo";
}
None => {}
}
}
}
mod only_pattern_rpit {
#[allow(unconditional_recursion)]
fn foo(b: bool) -> impl Copy {
let (mut x, mut y) = foo(false);
x = 42;
y = "foo";
if b {
panic!()
} else {
foo(true)
}
}
fn bar(b: bool) -> Option<impl Copy> {
if b {
return None;
}
match bar(!b) {
Some((mut x, mut y)) => {
x = 42;
y = "foo";
}
None => {}
}
None
}
}

1
src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs
View file

@ -260,6 +260,7 @@ fn check_place<'tcx>(tcx: TyCtxt<'tcx>, place: Place<'tcx>, span: Span, body: &B
}
},
ProjectionElem::ConstantIndex { .. }
| ProjectionElem::OpaqueCast(..)
| ProjectionElem::Downcast(..)
| ProjectionElem::Subslice { .. }
| ProjectionElem::Deref