pub struct RegionHighlightMode<'tcx> {
    highlight_regions: [Option<(Region<'tcx>, usize)>; 3],
    highlight_bound_region: Option<(BoundRegionKind, usize)>,
}
Expand description

The “region highlights” are used to control region printing during specific error messages. When a “region highlight” is enabled, it gives an alternate way to print specific regions. For now, we always print those regions using a number, so something like “'0”.

Regions not selected by the region highlight mode are presently unaffected.

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§highlight_regions: [Option<(Region<'tcx>, usize)>; 3]

If enabled, when we see the selected region, use “'N” instead of the ordinary behavior.

§highlight_bound_region: Option<(BoundRegionKind, usize)>

If enabled, when printing a “free region” that originated from the given ty::BoundRegionKind, print it as “'1”. Free regions that would ordinarily have names print as normal.

This is used when you have a signature like fn foo(x: &u32, y: &'a u32) and we want to give a name to the region of the reference x.

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impl<'tcx> RegionHighlightMode<'tcx>

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pub fn maybe_highlighting_region( &mut self, region: Option<Region<'tcx>>, number: Option<usize> )

If region and number are both Some, invokes highlighting_region.

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pub fn highlighting_region(&mut self, region: Region<'tcx>, number: usize)

Highlights the region inference variable vid as 'N.

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pub fn highlighting_region_vid( &mut self, tcx: TyCtxt<'tcx>, vid: RegionVid, number: usize )

Convenience wrapper for highlighting_region.

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fn region_highlighted(&self, region: Region<'tcx>) -> Option<usize>

Returns Some(n) with the number to use for the given region, if any.

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pub fn highlighting_bound_region(&mut self, br: BoundRegionKind, number: usize)

Highlight the given bound region. We can only highlight one bound region at a time. See the field highlight_bound_region for more detailed notes.

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impl<'tcx> Clone for RegionHighlightMode<'tcx>

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fn clone(&self) -> RegionHighlightMode<'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> Default for RegionHighlightMode<'tcx>

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fn default() -> RegionHighlightMode<'tcx>

Returns the “default value” for a type. Read more
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impl<'tcx> Copy for RegionHighlightMode<'tcx>

Auto Trait Implementations§

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impl<'tcx> RefUnwindSafe for RegionHighlightMode<'tcx>

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impl<'tcx> Send for RegionHighlightMode<'tcx>

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impl<'tcx> Sync for RegionHighlightMode<'tcx>

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impl<'tcx> Unpin for RegionHighlightMode<'tcx>

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impl<'tcx> UnwindSafe for RegionHighlightMode<'tcx>

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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 Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere T: Copy,

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fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut T

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fn allocate_from_iter<'a>( arena: &'a Arena<'tcx>, iter: impl IntoIterator<Item = T> ) -> &'a mut [T]

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impl<T> Borrow<T> for Twhere 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 Twhere 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, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> Rwhere 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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

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

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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> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<'tcx, T> ToPredicate<'tcx, T> for T

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fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> T

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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<Tcx, T> Value<Tcx> for Twhere Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle: &[QueryInfo], _guar: ErrorGuaranteed ) -> T

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: 72 bytes