[][src]Enum rustc_mir::borrow_check::nll::region_infer::RegionTest

pub enum RegionTest {
    IsOutlivedByAnyRegionIn(Vec<RegionVid>),
    IsOutlivedByAllRegionsIn(Vec<RegionVid>),
    Any(Vec<RegionTest>),
    All(Vec<RegionTest>),
}
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A "test" that can be applied to some "subject region" 'x. These are used to describe type constraints. Tests do not presently affect the region values that get inferred for each variable; they only examine the results after inference. This means they can conveniently include disjuction ("a or b must be true").

Variants

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The subject region 'x must by outlived by some region in the given set of regions.

This test comes from e.g. a where clause like T: 'a + 'b, which implies that we know that T: 'a and that T: 'b. Therefore, if we are trying to prove that T: 'x, we can do so by showing that 'a: 'x or 'b: 'x.

🔬 This is a nightly-only experimental API. (rustc_private)

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The subject region 'x must by outlived by all regions in the given set of regions.

This test comes from e.g. a projection type like T = <u32 as Trait<'a, 'b>>::Foo, which must outlive 'a or 'b, and maybe both. Therefore we can prove that T: 'x if we know that 'a: 'x and 'b: 'x.

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Any of the given tests are true.

This arises from projections, for which there are multiple ways to prove an outlives relationship.

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All of the given tests are true.

Trait Implementations

impl Clone for RegionTest
[src]

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

impl Debug for RegionTest
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Formats the value using the given formatter. Read more

Auto Trait Implementations

impl Send for RegionTest

impl Sync for RegionTest

Blanket Implementations

impl<T> ToOwned for T where
    T: Clone
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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

impl<T> From for T
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Performs the conversion.

impl<T, U> Into for T where
    U: From<T>, 
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Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
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🔬 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)

Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
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Important traits for &'a mut R

Immutably borrows from an owned value. Read more

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
[src]

🔬 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)

Performs the conversion.

impl<T> BorrowMut for T where
    T: ?Sized
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Important traits for &'a mut R

Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
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🔬 This is a nightly-only experimental API. (get_type_id)

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more

impl<E> SpecializationError for E
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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

impl<T> Erased for T
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impl<T> Send for T where
    T: ?Sized
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impl<T> Sync for T where
    T: ?Sized
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impl<T> Erased for T

impl<T> MaybeResult for T
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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 instead?

🔬 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?

impl<'a, T> Captures for T where
    T: ?Sized
[src]