[][src]Trait rustc::ty::query::keys::Key

pub(super) trait Key: Clone + Hash + Eq + Debug {
    fn query_crate(&self) -> CrateNum;
fn default_span(&self, tcx: TyCtxt) -> Span; }
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The Key trait controls what types can legally be used as the key for a query.

Required Methods

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

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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?

Implementations on Foreign Types

impl Key for (DefId, DefId)
[src]

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

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impl Key for (CrateNum, DefId)
[src]

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

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impl Key for (DefId, SimplifiedType)
[src]

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

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impl<'tcx> Key for (DefId, &'tcx Substs<'tcx>)
[src]

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

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impl<'tcx> Key for (ParamEnv<'tcx>, PolyTraitRef<'tcx>)
[src]

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

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impl Key for InternedString
[src]

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

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Implementors

impl Key for CrateNum
[src]

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

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impl Key for DefId
[src]

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impl Key for DefIndex
[src]

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

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impl<'tcx> Key for &'tcx Const<'tcx>
[src]

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impl<'tcx> Key for InstanceDef<'tcx>
[src]

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impl<'tcx> Key for GlobalId<'tcx>
[src]

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impl<'tcx> Key for Instance<'tcx>
[src]

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

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impl<'tcx> Key for ParamEnv<'tcx>
[src]

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

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impl<'tcx> Key for PolyTraitRef<'tcx>
[src]

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impl<'tcx> Key for Ty<'tcx>
[src]

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impl<'tcx, T> Key for Canonical<'tcx, T> where
    T: Debug + Hash + Clone + Eq
[src]

Canonical query goals correspond to abstract trait operations that are not tied to any crate in particular.

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

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impl<'tcx, T: Key> Key for ParamEnvAnd<'tcx, T>
[src]

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

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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?