Trait rustc::ty::maps::Key

pub trait Key: Clone + Hash + Eq + Debug {
    fn map_crate(&self) -> CrateNum;
    fn default_span(&self, tcx: TyCtxt) -> Span;
}

🔬 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?

The Key trait controls what types can legally be used as the key for a query.

Required Methods

fn map_crate(&self) -> CrateNum

🔬 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.

fn default_span(&self, tcx: TyCtxt) -> Span

🔬 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?

Implementations on Foreign Types

impl Key for (DefId, DefId)

fn map_crate(&self) -> CrateNum

🔬 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?

fn default_span(&self, tcx: TyCtxt) -> Span

🔬 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 Key for (CrateNum, DefId)

fn map_crate(&self) -> CrateNum

🔬 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?

fn default_span(&self, tcx: TyCtxt) -> Span

🔬 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 Key for (DefId, SimplifiedType)

fn map_crate(&self) -> CrateNum

🔬 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?

fn default_span(&self, tcx: TyCtxt) -> Span

🔬 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 (DefId, &'tcx Substs<'tcx>)

fn map_crate(&self) -> CrateNum

🔬 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?

fn default_span(&self, tcx: TyCtxt) -> Span

🔬 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 (ParamEnv<'tcx>, PolyTraitRef<'tcx>)

fn map_crate(&self) -> CrateNum

🔬 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?

fn default_span(&self, tcx: TyCtxt) -> Span

🔬 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 Key for InternedString

fn map_crate(&self) -> CrateNum

🔬 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?

fn default_span(&self, _tcx: TyCtxt) -> Span

🔬 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?

Implementors

• impl<'tcx> Key for InstanceDef<'tcx>
• impl<'tcx> Key for Instance<'tcx>
• impl Key for CrateNum
• impl Key for DefIndex
• impl Key for DefId
• impl<'tcx> Key for PolyTraitRef<'tcx>
• impl<'tcx> Key for Ty<'tcx>
• impl<'tcx, T: Key> Key for ParamEnvAnd<'tcx, T>