pub enum BorrowKind {
ImmBorrow,
UniqueImmBorrow,
MutBorrow,
}
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🔬 This is a nightly-only experimental API. (rustc_private
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Data must be immutable and is aliasable.
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Data must be immutable but not aliasable. This kind of borrow
cannot currently be expressed by the user and is used only in
implicit closure bindings. It is needed when the closure
is borrowing or mutating a mutable referent, e.g.:
let x: &mut isize = ...;
let y = || *x += 5;
If we were to try to translate this closure into a more explicit
form, we'd encounter an error with the code as written:
struct Env { x: & &mut isize }
let x: &mut isize = ...;
let y = (&mut Env { &x }, fn_ptr); // Closure is pair of env and fn
fn fn_ptr(env: &mut Env) { **env.x += 5; }
This is then illegal because you cannot mutate a &mut
found
in an aliasable location. To solve, you'd have to translate with
an &mut
borrow:
struct Env { x: & &mut isize }
let x: &mut isize = ...;
let y = (&mut Env { &mut x }, fn_ptr); // changed from &x to &mut x
fn fn_ptr(env: &mut Env) { **env.x += 5; }
Now the assignment to **env.x
is legal, but creating a
mutable pointer to x
is not because x
is not mutable. We
could fix this by declaring x
as let mut x
. This is ok in
user code, if awkward, but extra weird for closures, since the
borrow is hidden.
So we introduce a "unique imm" borrow -- the referent is
immutable, but not aliasable. This solves the problem. For
simplicity, we don't give users the way to express this
borrow, it's just used when translating closures.
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Data is mutable and not aliasable.
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🔬 This is a nightly-only experimental API. (rustc_private
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Returns a mutability m
such that an &m T
pointer could be used to obtain this borrow
kind. Because borrow kinds are richer than mutabilities, we sometimes have to pick a
mutability that is stronger than necessary so that it at least would permit the borrow in
question.
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🔬 This is a nightly-only experimental API. (rustc_private
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Performs copy-assignment from source
. 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
Formats the value using the given formatter. Read more
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🔬 This is a nightly-only experimental API. (rustc_private
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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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🔬 This is a nightly-only experimental API. (rustc_private
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🔬 This is a nightly-only experimental API. (rustc_private
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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
🔬 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
)
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
🔬 This is a nightly-only experimental API. (rustc_private
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🔬 This is a nightly-only experimental API. (rustc_private
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🔬 This is a nightly-only experimental API. (rustc_private
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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