Struct rustc::ty::Instance [] [src]

pub struct Instance<'tcx> {
    pub def: InstanceDef<'tcx>,
    pub substs: &'tcx Substs<'tcx>,
}
🔬 This is a nightly-only experimental API. (rustc_private)

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Fields

🔬 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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Methods

impl<'a, 'b, 'tcx> Instance<'tcx>
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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?

[src]

🔬 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?

[src]

🔬 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?

[src]

🔬 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?

Resolve a (def_id, substs) pair to an (optional) instance -- most commonly, this is used to find the precise code that will run for a trait method invocation, if known.

Returns None if we cannot resolve Instance to a specific instance. For example, in a context like this,

fn foo<T: Debug>(t: T) { ... }

trying to resolve Debug::fmt applied to T will yield None, because we do not know what code ought to run. (Note that this setting is also affected by the RevealMode in the parameter environment.)

Presuming that coherence and type-check have succeeded, if this method is invoked in a monomorphic context (i.e., like during trans), then it is guaranteed to return Some.

Trait Implementations

impl<'tcx> HashStable<StableHashingContext<'tcx>> for Instance<'tcx>
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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?

impl<'tcx> Key for Instance<'tcx>
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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?

Given an instance of this key, what crate is it referring to? This is used to find the provider. Read more

[src]

🔬 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?

In the event that a cycle occurs, if no explicit span has been given for a query with key self, what span should we use? Read more

impl<'tcx> Copy for Instance<'tcx>
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impl<'tcx> Clone for Instance<'tcx>
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Returns a copy of the value. Read more

1.0.0
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Performs copy-assignment from source. Read more

impl<'tcx> PartialEq for Instance<'tcx>
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl<'tcx> Eq for Instance<'tcx>
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impl<'tcx> Hash for Instance<'tcx>
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Feeds this value into the given [Hasher]. Read more

1.3.0
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Feeds a slice of this type into the given [Hasher]. Read more

impl<'tcx> Debug for Instance<'tcx>
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Formats the value using the given formatter.

impl<'tcx> Display for Instance<'tcx>
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Formats the value using the given formatter. Read more