pub enum RegionClassification {
Global,
External,
Local,
}
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A global region is one that can be named from
anywhere. There is only one, 'static
.
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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.
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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).
Performs copy-assignment from source
. Read more
Formats the value using the given formatter. Read more
This method tests for self
and other
values to be equal, and is used by ==
. Read more
This method tests for !=
.
Feeds this value into the given [Hasher
]. Read more
Feeds a slice of this type into the given [Hasher
]. Read more
Creates owned data from borrowed data, usually by cloning. Read more
🔬 This is a nightly-only experimental API. (toowned_clone_into
)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
🔬 This is a nightly-only experimental API. (try_from
)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
Immutably borrows from an owned value. Read more
type Error = <U as TryFrom<T>>::Error
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)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
Mutably borrows from an owned value. Read more
🔬 This is a nightly-only experimental API. (get_type_id
)
this method will likely be replaced by an associated static
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Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S
is the encoder/decoder state type, T
is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more
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🔬 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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