Enum rustc_middle::mir::query::ConstraintCategory
source · [−]pub enum ConstraintCategory<'tcx> {
Show 18 variants
Return(ReturnConstraint),
Yield,
UseAsConst,
UseAsStatic,
TypeAnnotation,
Cast,
ClosureBounds,
CallArgument(Option<Ty<'tcx>>),
CopyBound,
SizedBound,
Assignment,
Usage,
OpaqueType,
ClosureUpvar(Field),
Predicate(Span),
Boring,
BoringNoLocation,
Internal,
}
Expand description
Outlives-constraints can be categorized to determine whether and why they are interesting (for error reporting). Order of variants indicates sort order of the category, thereby influencing diagnostic output.
See also rustc_const_eval::borrow_check::constraints
.
Variants
Return(ReturnConstraint)
Yield
UseAsConst
UseAsStatic
TypeAnnotation
Cast
ClosureBounds
A constraint that came from checking the body of a closure.
We try to get the category that the closure used when reporting this.
CallArgument(Option<Ty<'tcx>>)
Contains the function type if available.
CopyBound
SizedBound
Assignment
Usage
A constraint that came from a usage of a variable (e.g. in an ADT expression
like Foo { field: my_val }
)
OpaqueType
ClosureUpvar(Field)
Predicate(Span)
A constraint from a user-written predicate
with the provided span, written on the item
with the given DefId
Boring
A “boring” constraint (caused by the given location) is one that the user probably doesn’t want to see described in diagnostics, because it is kind of an artifact of the type system setup.
BoringNoLocation
Internal
A constraint that doesn’t correspond to anything the user sees.
Trait Implementations
sourceimpl<'tcx> Clone for ConstraintCategory<'tcx>
impl<'tcx> Clone for ConstraintCategory<'tcx>
sourcefn clone(&self) -> ConstraintCategory<'tcx>
fn clone(&self) -> ConstraintCategory<'tcx>
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
sourceimpl<'tcx> Debug for ConstraintCategory<'tcx>
impl<'tcx> Debug for ConstraintCategory<'tcx>
sourceimpl<'tcx, __D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<__D> for ConstraintCategory<'tcx>
impl<'tcx, __D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<__D> for ConstraintCategory<'tcx>
sourceimpl<'tcx, __E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<__E> for ConstraintCategory<'tcx>
impl<'tcx, __E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<__E> for ConstraintCategory<'tcx>
sourceimpl<'tcx> Hash for ConstraintCategory<'tcx>
impl<'tcx> Hash for ConstraintCategory<'tcx>
sourceimpl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for ConstraintCategory<'tcx>
impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for ConstraintCategory<'tcx>
fn hash_stable(
&self,
__hcx: &mut StableHashingContext<'__ctx>,
__hasher: &mut StableHasher
)
sourceimpl<'tcx> Ord for ConstraintCategory<'tcx>
impl<'tcx> Ord for ConstraintCategory<'tcx>
sourcefn cmp(&self, other: &ConstraintCategory<'tcx>) -> Ordering
fn cmp(&self, other: &ConstraintCategory<'tcx>) -> Ordering
1.21.0 · sourcefn max(self, other: Self) -> Self
fn max(self, other: Self) -> Self
Compares and returns the maximum of two values. Read more
1.21.0 · sourcefn min(self, other: Self) -> Self
fn min(self, other: Self) -> Self
Compares and returns the minimum of two values. Read more
1.50.0 · sourcefn clamp(self, min: Self, max: Self) -> Self where
Self: PartialOrd<Self>,
fn clamp(self, min: Self, max: Self) -> Self where
Self: PartialOrd<Self>,
Restrict a value to a certain interval. Read more
sourceimpl<'tcx> PartialEq<ConstraintCategory<'tcx>> for ConstraintCategory<'tcx>
impl<'tcx> PartialEq<ConstraintCategory<'tcx>> for ConstraintCategory<'tcx>
sourcefn eq(&self, other: &ConstraintCategory<'tcx>) -> bool
fn eq(&self, other: &ConstraintCategory<'tcx>) -> bool
This method tests for self
and other
values to be equal, and is used
by ==
. Read more
sourcefn ne(&self, other: &ConstraintCategory<'tcx>) -> bool
fn ne(&self, other: &ConstraintCategory<'tcx>) -> bool
This method tests for !=
.
sourceimpl<'tcx> PartialOrd<ConstraintCategory<'tcx>> for ConstraintCategory<'tcx>
impl<'tcx> PartialOrd<ConstraintCategory<'tcx>> for ConstraintCategory<'tcx>
sourcefn partial_cmp(&self, other: &ConstraintCategory<'tcx>) -> Option<Ordering>
fn partial_cmp(&self, other: &ConstraintCategory<'tcx>) -> Option<Ordering>
This method returns an ordering between self
and other
values if one exists. Read more
1.0.0 · sourcefn lt(&self, other: &Rhs) -> bool
fn lt(&self, other: &Rhs) -> bool
This method tests less than (for self
and other
) and is used by the <
operator. Read more
1.0.0 · sourcefn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
impl<'tcx> Copy for ConstraintCategory<'tcx>
impl<'tcx> Eq for ConstraintCategory<'tcx>
impl<'tcx> StructuralEq for ConstraintCategory<'tcx>
impl<'tcx> StructuralPartialEq for ConstraintCategory<'tcx>
Auto Trait Implementations
impl<'tcx> !RefUnwindSafe for ConstraintCategory<'tcx>
impl<'tcx> !Send for ConstraintCategory<'tcx>
impl<'tcx> !Sync for ConstraintCategory<'tcx>
impl<'tcx> Unpin for ConstraintCategory<'tcx>
impl<'tcx> !UnwindSafe for ConstraintCategory<'tcx>
Blanket Implementations
sourceimpl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for T where
T: Copy,
impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for T where
T: Copy,
fn allocate_on(self, arena: &'a Arena<'tcx>) -> &'a mut T
fn allocate_from_iter(
arena: &'a Arena<'tcx>,
iter: impl IntoIterator<Item = T>
) -> &'a mut [T]ⓘNotable traits for &[u8]impl Read for &[u8]impl Write for &mut [u8]
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<Ctxt, T> DepNodeParams<Ctxt> for T where
Ctxt: DepContext,
T: for<'a> HashStable<StableHashingContext<'a>> + Debug,
impl<Ctxt, T> DepNodeParams<Ctxt> for T where
Ctxt: DepContext,
T: for<'a> HashStable<StableHashingContext<'a>> + Debug,
default fn fingerprint_style() -> FingerprintStyle
sourcedefault fn to_fingerprint(&self, tcx: Ctxt) -> Fingerprint
default fn to_fingerprint(&self, tcx: Ctxt) -> Fingerprint
This method turns the parameters of a DepNodeConstructor into an opaque Fingerprint to be used in DepNode. Not all DepNodeParams support being turned into a Fingerprint (they don’t need to if the corresponding DepNode is anonymous). Read more
default fn to_debug_str(&self, Ctxt) -> String
sourcedefault fn recover(Ctxt, &DepNode<<Ctxt as DepContext>::DepKind>) -> Option<T>
default fn recover(Ctxt, &DepNode<<Ctxt as DepContext>::DepKind>) -> Option<T>
This method tries to recover the query key from the given DepNode
,
something which is needed when forcing DepNode
s during red-green
evaluation. The query system will only call this method if
fingerprint_style()
is not FingerprintStyle::Opaque
.
It is always valid to return None
here, in which case incremental
compilation will treat the query as having changed instead of forcing it. Read more
sourceimpl<T, R> InternIteratorElement<T, R> for T
impl<T, R> InternIteratorElement<T, R> for T
type Output = R
fn intern_with<I, F>(iter: I, f: F) -> <T as InternIteratorElement<T, R>>::Output where
I: Iterator<Item = T>,
F: FnOnce(&[T]) -> R,
sourceimpl<T> MaybeResult<T> for T
impl<T> MaybeResult<T> for T
impl<'a, T> Captures<'a> for T where
T: ?Sized,
Layout
Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...)
attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.
Size: 16 bytes
Size for each variant:
Return
: 4 bytesYield
: 0 bytesUseAsConst
: 0 bytesUseAsStatic
: 0 bytesTypeAnnotation
: 0 bytesCast
: 0 bytesClosureBounds
: 0 bytesCallArgument
: 12 bytesCopyBound
: 0 bytesSizedBound
: 0 bytesAssignment
: 0 bytesUsage
: 0 bytesOpaqueType
: 0 bytesClosureUpvar
: 4 bytesPredicate
: 8 bytesBoring
: 0 bytesBoringNoLocation
: 0 bytesInternal
: 0 bytes