Struct rustc_middle::ty::print::pretty::RegionHighlightMode
source · pub struct RegionHighlightMode<'tcx> {
tcx: TyCtxt<'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.
Fields
tcx: TyCtxt<'tcx>
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
.
Implementations
sourceimpl<'tcx> RegionHighlightMode<'tcx>
impl<'tcx> RegionHighlightMode<'tcx>
pub fn new(tcx: TyCtxt<'tcx>) -> Self
sourcepub fn maybe_highlighting_region(
&mut self,
region: Option<Region<'tcx>>,
number: Option<usize>
)
pub fn maybe_highlighting_region(
&mut self,
region: Option<Region<'tcx>>,
number: Option<usize>
)
If region
and number
are both Some
, invokes
highlighting_region
.
sourcepub fn highlighting_region(&mut self, region: Region<'tcx>, number: usize)
pub fn highlighting_region(&mut self, region: Region<'tcx>, number: usize)
Highlights the region inference variable vid
as 'N
.
sourcepub fn highlighting_region_vid(&mut self, vid: RegionVid, number: usize)
pub fn highlighting_region_vid(&mut self, vid: RegionVid, number: usize)
Convenience wrapper for highlighting_region
.
sourcefn region_highlighted(&self, region: Region<'tcx>) -> Option<usize>
fn region_highlighted(&self, region: Region<'tcx>) -> Option<usize>
Returns Some(n)
with the number to use for the given region, if any.
sourcepub fn highlighting_bound_region(&mut self, br: BoundRegionKind, number: usize)
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.
Trait Implementations
sourceimpl<'tcx> Clone for RegionHighlightMode<'tcx>
impl<'tcx> Clone for RegionHighlightMode<'tcx>
sourcefn clone(&self) -> RegionHighlightMode<'tcx>
fn clone(&self) -> RegionHighlightMode<'tcx>
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moreimpl<'tcx> Copy for RegionHighlightMode<'tcx>
Auto Trait Implementations
impl<'tcx> !RefUnwindSafe for RegionHighlightMode<'tcx>
impl<'tcx> !Send for RegionHighlightMode<'tcx>
impl<'tcx> !Sync for RegionHighlightMode<'tcx>
impl<'tcx> Unpin for RegionHighlightMode<'tcx>
impl<'tcx> !UnwindSafe for RegionHighlightMode<'tcx>
Blanket Implementations
sourceimpl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere
T: Copy,
impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere
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 Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
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>>::Outputwhere
I: Iterator<Item = T>,
F: FnOnce(&[T]) -> R,
sourceimpl<T> MaybeResult<T> for T
impl<T> MaybeResult<T> for T
sourceimpl<CTX, T> Value<CTX> for Twhere
CTX: DepContext,
impl<CTX, T> Value<CTX> for Twhere
CTX: DepContext,
default fn from_cycle_error(tcx: CTX) -> T
impl<'a, T> Captures<'a> for Twhere
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: 80 bytes