Enum rustc_type_ir::relate::VarianceDiagInfo
source · pub enum VarianceDiagInfo<I: Interner> {
None,
Invariant {
ty: I::Ty,
param_index: u32,
},
}
Expand description
Extra information about why we ended up with a particular variance.
This is only used to add more information to error messages, and
has no effect on soundness. While choosing the ‘wrong’ VarianceDiagInfo
may lead to confusing notes in error messages, it will never cause
a miscompilation or unsoundness.
When in doubt, use VarianceDiagInfo::default()
Variants§
None
No additional information - this is the default. We will not add any additional information to error messages.
Invariant
We switched our variance because a generic argument occurs inside the invariant generic argument of another type.
Implementations§
source§impl<I: Interner> VarianceDiagInfo<I>
impl<I: Interner> VarianceDiagInfo<I>
sourcepub fn xform(self, other: VarianceDiagInfo<I>) -> VarianceDiagInfo<I>
pub fn xform(self, other: VarianceDiagInfo<I>) -> VarianceDiagInfo<I>
Mirrors Variance::xform
- used to ‘combine’ the existing
and new VarianceDiagInfo
s when our variance changes.
Trait Implementations§
source§impl<I: Interner> Clone for VarianceDiagInfo<I>
impl<I: Interner> Clone for VarianceDiagInfo<I>
source§impl<I: Interner> Debug for VarianceDiagInfo<I>
impl<I: Interner> Debug for VarianceDiagInfo<I>
source§impl<I: Interner> Default for VarianceDiagInfo<I>
impl<I: Interner> Default for VarianceDiagInfo<I>
source§impl<I: Interner> PartialEq for VarianceDiagInfo<I>
impl<I: Interner> PartialEq for VarianceDiagInfo<I>
impl<I: Interner> Copy for VarianceDiagInfo<I>
impl<I: Interner> Eq for VarianceDiagInfo<I>
Auto Trait Implementations§
impl<I> Freeze for VarianceDiagInfo<I>
impl<I> RefUnwindSafe for VarianceDiagInfo<I>
impl<I> Send for VarianceDiagInfo<I>
impl<I> Sync for VarianceDiagInfo<I>
impl<I> Unpin for VarianceDiagInfo<I>
impl<I> UnwindSafe for VarianceDiagInfo<I>
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<T> CloneToUninit for Twhere
T: Copy,
impl<T> CloneToUninit for Twhere
T: Copy,
source§unsafe fn clone_to_uninit(&self, dst: *mut T)
unsafe fn clone_to_uninit(&self, dst: *mut T)
clone_to_uninit
)source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§default unsafe fn clone_to_uninit(&self, dst: *mut T)
default unsafe fn clone_to_uninit(&self, dst: *mut T)
clone_to_uninit
)source§impl<T, R> CollectAndApply<T, R> for T
impl<T, R> CollectAndApply<T, R> for T
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§impl<I, T, U> Upcast<I, U> for Twhere
U: UpcastFrom<I, T>,
impl<I, T, U> Upcast<I, U> for Twhere
U: UpcastFrom<I, T>,
source§impl<I, T> UpcastFrom<I, T> for T
impl<I, T> UpcastFrom<I, T> for T
fn upcast_from(from: T, _tcx: I) -> T
source§impl<T> WithSubscriber for T
impl<T> WithSubscriber for T
source§fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
source§fn with_current_subscriber(self) -> WithDispatch<Self>
fn with_current_subscriber(self) -> WithDispatch<Self>
impl<'a, T> Captures<'a> for Twhere
T: ?Sized,
Layout§
Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.