Struct rustc_infer::infer::free_regions::FreeRegionMap

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pub struct FreeRegionMap<'tcx> {
    pub(crate) relation: TransitiveRelation<Region<'tcx>>,
}

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§relation: TransitiveRelation<Region<'tcx>>

Stores the relation a < b, where a and b are regions.

Invariant: only free regions like 'x or 'static are stored in this relation, not scopes.

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impl<'tcx> FreeRegionMap<'tcx>

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pub fn elements(&self) -> impl Iterator<Item = Region<'tcx>> + '_

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pub fn is_empty(&self) -> bool

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pub fn sub_free_regions( &self, tcx: TyCtxt<'tcx>, r_a: Region<'tcx>, r_b: Region<'tcx>, ) -> bool

Tests whether r_a <= r_b.

Both regions must meet is_free_or_static.

Subtle: one tricky case that this code gets correct is as follows. If we know that r_b: 'static, then this function will return true, even though we don’t know anything that directly relates r_a and r_b.

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fn check_relation(&self, r_a: Region<'tcx>, r_b: Region<'tcx>) -> bool

Check whether r_a <= r_b is found in the relation.

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pub fn lub_param_regions( &self, tcx: TyCtxt<'tcx>, r_a: Region<'tcx>, r_b: Region<'tcx>, ) -> Region<'tcx>

Computes the least-upper-bound of two free regions. In some cases, this is more conservative than necessary, in order to avoid making arbitrary choices. See TransitiveRelation::postdom_upper_bound for more details.

Trait Implementations§

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impl<'tcx> Clone for FreeRegionMap<'tcx>

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fn clone(&self) -> FreeRegionMap<'tcx>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<'tcx> Debug for FreeRegionMap<'tcx>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<'tcx> DynSend for FreeRegionMap<'tcx>

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impl<'tcx> DynSync for FreeRegionMap<'tcx>

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impl<'tcx> Freeze for FreeRegionMap<'tcx>

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impl<'tcx> RefUnwindSafe for FreeRegionMap<'tcx>

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impl<'tcx> Send for FreeRegionMap<'tcx>

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impl<'tcx> Sync for FreeRegionMap<'tcx>

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impl<'tcx> Unpin for FreeRegionMap<'tcx>

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impl<'tcx> UnwindSafe for FreeRegionMap<'tcx>

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<T> Filterable for T

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fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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where U: From<T>,

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Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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Converts 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 more
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where F: FnOnce(&Self) -> bool,

Converts 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 more
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impl<P> IntoQueryParam<P> for P

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impl<T> MaybeResult<T> for T

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type Error = !

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fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

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unsafe fn deref<'a>(ptr: usize) -> &'a T

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unsafe fn drop(ptr: usize)

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impl<T> Same for T

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type Output = T

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where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

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Performs the conversion.
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where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

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fn vzip(self) -> V

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impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

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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: 128 bytes