struct UniversalRegionIndices<'tcx> {
indices: FxIndexMap<Region<'tcx>, RegionVid>,
pub fr_static: RegionVid,
pub tainted_by_errors: Cell<Option<ErrorGuaranteed>>,
}
Fields§
§indices: FxIndexMap<Region<'tcx>, RegionVid>
For those regions that may appear in the parameter environment
(’static and early-bound regions), we maintain a map from the
ty::Region
to the internal RegionVid
we are using. This is
used because trait matching and type-checking will feed us
region constraints that reference those regions and we need to
be able to map them to our internal RegionVid
. This is
basically equivalent to an GenericArgs
, except that it also
contains an entry for ReStatic
– it might be nice to just
use an args, and then handle ReStatic
another way.
fr_static: RegionVid
The vid assigned to 'static
. Used only for diagnostics.
tainted_by_errors: Cell<Option<ErrorGuaranteed>>
Whether we’ve encountered an error region. If we have, cancel all outlives errors, as they are likely bogus.
Implementations§
source§impl<'tcx> UniversalRegionIndices<'tcx>
impl<'tcx> UniversalRegionIndices<'tcx>
sourcefn insert_late_bound_region(&mut self, r: Region<'tcx>, vid: RegionVid)
fn insert_late_bound_region(&mut self, r: Region<'tcx>, vid: RegionVid)
Initially, the UniversalRegionIndices
map contains only the
early-bound regions in scope. Once that is all setup, we come
in later and instantiate the late-bound regions, and then we
insert the ReLateParam
version of those into the map as
well. These are used for error reporting.
sourcefn to_region_vid(&self, r: Region<'tcx>) -> RegionVid
fn to_region_vid(&self, r: Region<'tcx>) -> RegionVid
Converts r
into a local inference variable: r
can either
be a ReVar
(i.e., already a reference to an inference
variable) or it can be 'static
or some early-bound
region. This is useful when taking the results from
type-checking and trait-matching, which may sometimes
reference those regions from the ParamEnv
. It is also used
during initialization. Relies on the indices
map having been
fully initialized.
sourcefn fold_to_region_vids<T>(&self, tcx: TyCtxt<'tcx>, value: T) -> Twhere
T: TypeFoldable<TyCtxt<'tcx>>,
fn fold_to_region_vids<T>(&self, tcx: TyCtxt<'tcx>, value: T) -> Twhere
T: TypeFoldable<TyCtxt<'tcx>>,
Replaces all free regions in value
with region vids, as
returned by to_region_vid
.
Trait Implementations§
Auto Trait Implementations§
impl<'tcx> DynSend for UniversalRegionIndices<'tcx>
impl<'tcx> !DynSync for UniversalRegionIndices<'tcx>
impl<'tcx> !Freeze for UniversalRegionIndices<'tcx>
impl<'tcx> !RefUnwindSafe for UniversalRegionIndices<'tcx>
impl<'tcx> Send for UniversalRegionIndices<'tcx>
impl<'tcx> !Sync for UniversalRegionIndices<'tcx>
impl<'tcx> Unpin for UniversalRegionIndices<'tcx>
impl<'tcx> UnwindSafe for UniversalRegionIndices<'tcx>
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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: 64 bytes