Struct rustc_mir::borrow_check::nll::type_check::free_region_relations::UniversalRegionRelations [−][src]
pub(crate) struct UniversalRegionRelations<'tcx> { universal_regions: Rc<UniversalRegions<'tcx>>, outlives: TransitiveRelation<RegionVid>, inverse_outlives: TransitiveRelation<RegionVid>, }
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Fields
universal_regions: Rc<UniversalRegions<'tcx>>
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outlives: TransitiveRelation<RegionVid>
🔬 This is a nightly-only experimental API. (rustc_private
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Stores the outlives relations that are known to hold from the implied bounds, in-scope where clauses, and that sort of thing.
inverse_outlives: TransitiveRelation<RegionVid>
🔬 This is a nightly-only experimental API. (rustc_private
)
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This is the <=
relation; that is, if a: b
, then b <= a
,
and we store that here. This is useful when figuring out how
to express some local region in terms of external regions our
caller will understand.
Methods
impl<'tcx> UniversalRegionRelations<'tcx>
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impl<'tcx> UniversalRegionRelations<'tcx>
fn relate_universal_regions(&mut self, fr_a: RegionVid, fr_b: RegionVid)
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fn relate_universal_regions(&mut self, fr_a: RegionVid, fr_b: RegionVid)
🔬 This is a nightly-only experimental API. (rustc_private
)
this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml
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Records in the outlives_relation
(and
inverse_outlives_relation
) that fr_a: fr_b
. Invoked by the
builder below.
pub(crate) fn postdom_upper_bound(
&self,
fr1: RegionVid,
fr2: RegionVid
) -> RegionVid
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pub(crate) fn postdom_upper_bound(
&self,
fr1: RegionVid,
fr2: RegionVid
) -> RegionVid
🔬 This is a nightly-only experimental API. (rustc_private
)
this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml
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Given two universal regions, returns the postdominating upper-bound (effectively the least upper bound).
(See TransitiveRelation::postdom_upper_bound
for details on
the postdominating upper bound in general.)
pub(crate) fn non_local_upper_bound(&self, fr: RegionVid) -> RegionVid
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pub(crate) fn non_local_upper_bound(&self, fr: RegionVid) -> RegionVid
🔬 This is a nightly-only experimental API. (rustc_private
)
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Finds an "upper bound" for fr
that is not local. In other
words, returns the smallest (*) known region fr1
that (a)
outlives fr
and (b) is not local. This cannot fail, because
we will always find 'static
at worst.
(*) If there are multiple competing choices, we pick the "postdominating"
one. See TransitiveRelation::postdom_upper_bound
for details.
pub(crate) fn non_local_lower_bound(&self, fr: RegionVid) -> Option<RegionVid>
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pub(crate) fn non_local_lower_bound(&self, fr: RegionVid) -> Option<RegionVid>
🔬 This is a nightly-only experimental API. (rustc_private
)
this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml
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Finds a "lower bound" for fr
that is not local. In other
words, returns the largest (*) known region fr1
that (a) is
outlived by fr
and (b) is not local. This cannot fail,
because we will always find 'static
at worst.
(*) If there are multiple competing choices, we pick the "postdominating"
one. See TransitiveRelation::postdom_upper_bound
for details.
fn non_local_bound(
&self,
relation: &TransitiveRelation<RegionVid>,
fr0: RegionVid
) -> Option<RegionVid>
[src]
fn non_local_bound(
&self,
relation: &TransitiveRelation<RegionVid>,
fr0: RegionVid
) -> Option<RegionVid>
🔬 This is a nightly-only experimental API. (rustc_private
)
this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml
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Helper for non_local_upper_bound
and
non_local_lower_bound
. Repeatedly invokes postdom_parent
until we find something that is not local. Returns None if we
never do so.
pub(crate) fn outlives(&self, fr1: RegionVid, fr2: RegionVid) -> bool
[src]
pub(crate) fn outlives(&self, fr1: RegionVid, fr2: RegionVid) -> bool
🔬 This is a nightly-only experimental API. (rustc_private
)
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True if fr1 is known to outlive fr2.
This will only ever be true for universally quantified regions.
pub(crate) fn regions_outlived_by(&self, fr1: RegionVid) -> Vec<&RegionVid>
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pub(crate) fn regions_outlived_by(&self, fr1: RegionVid) -> Vec<&RegionVid>
🔬 This is a nightly-only experimental API. (rustc_private
)
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Returns a vector of free regions x
such that fr1: x
is
known to hold.
Trait Implementations
impl<'tcx> Debug for UniversalRegionRelations<'tcx>
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impl<'tcx> Debug for UniversalRegionRelations<'tcx>
fn fmt(&self, f: &mut Formatter) -> Result
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fn fmt(&self, f: &mut Formatter) -> Result
Formats the value using the given formatter. Read more
impl<'tcx> FreeRegionRelations<'tcx> for UniversalRegionRelations<'tcx>
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impl<'tcx> FreeRegionRelations<'tcx> for UniversalRegionRelations<'tcx>
This trait is used by the impl-trait
constraint code to abstract
over the FreeRegionMap
from lexical regions and
UniversalRegions
(from NLL)`.
fn sub_free_regions(&self, shorter: Region<'tcx>, longer: Region<'tcx>) -> bool
[src]
fn sub_free_regions(&self, shorter: Region<'tcx>, longer: Region<'tcx>) -> bool
🔬 This is a nightly-only experimental API. (rustc_private
)
this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml
instead?
Tests whether r_a <= r_b
. Both must be free regions or 'static
. Read more
Auto Trait Implementations
impl<'tcx> !Send for UniversalRegionRelations<'tcx>
impl<'tcx> !Send for UniversalRegionRelations<'tcx>
impl<'tcx> !Sync for UniversalRegionRelations<'tcx>
impl<'tcx> !Sync for UniversalRegionRelations<'tcx>