Enum rustc_mir::borrow_check::nll::universal_regions::RegionClassification [−][src]
pub enum RegionClassification { Global, External, Local, }
🔬 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?
Variants
Global
🔬 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?
A global region is one that can be named from
anywhere. There is only one, 'static
.
External
🔬 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?
An external region is only relevant for closures. In that case, it refers to regions that are free in the closure type -- basically, something bound in the surrounding context.
Consider this example:
fn foo<'a, 'b>(a: &'a u32, b: &'b u32, c: &'static u32) { let closure = for<'x> |x: &'x u32| { .. }; ^^^^^^^ pretend this were legal syntax for declaring a late-bound region in a closure signature }
Here, the lifetimes 'a
and 'b
would be external to the
closure.
If we are not analyzing a closure, there are no external lifetimes.
Local
🔬 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?
A local lifetime is one about which we know the full set of relevant constraints (that is, relationships to other named regions). For a closure, this includes any region bound in the closure's signature. For a fn item, this includes all regions other than global ones.
Continuing with the example from External
, if we were
analyzing the closure, then 'x
would be local (and 'a
and
'b
are external). If we are analyzing the function item
foo
, then 'a
and 'b
are local (and 'x
is not in
scope).
Trait Implementations
impl Copy for RegionClassification
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impl Copy for RegionClassification
impl Clone for RegionClassification
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impl Clone for RegionClassification
fn clone(&self) -> RegionClassification
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fn clone(&self) -> RegionClassification
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0[src]
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
impl Debug for RegionClassification
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impl Debug for RegionClassification
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 PartialEq for RegionClassification
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impl PartialEq for RegionClassification
fn eq(&self, other: &RegionClassification) -> bool
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fn eq(&self, other: &RegionClassification) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, other: &Rhs) -> bool
1.0.0[src]
fn ne(&self, other: &Rhs) -> bool
This method tests for !=
.
impl Eq for RegionClassification
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impl Eq for RegionClassification
fn assert_receiver_is_total_eq(&self)
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fn assert_receiver_is_total_eq(&self)
impl Hash for RegionClassification
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impl Hash for RegionClassification
Auto Trait Implementations
impl Send for RegionClassification
impl Send for RegionClassification
impl Sync for RegionClassification
impl Sync for RegionClassification