Struct rustc_infer::infer::at::At

pub struct At<'a, 'tcx> {
    pub infcx: &'a InferCtxt<'tcx>,
    pub cause: &'a ObligationCause<'tcx>,
    pub param_env: ParamEnv<'tcx>,
}

Fields

infcx: &'a InferCtxt<'tcx>

cause: &'a ObligationCause<'tcx>

param_env: ParamEnv<'tcx>

Implementations

impl<'a, 'tcx> At<'a, 'tcx>

pub fn sup<T>( self, define_opaque_types: DefineOpaqueTypes, expected: T, actual: T ) -> InferResult<'tcx, ()>

where T: ToTrace<'tcx>,

Makes actual <: expected. For example, if type-checking a call like foo(x), where foo: fn(i32), you might have sup(i32, x), since the “expected” type is the type that appears in the signature.

See At::trace and Trace::sub for a version of this method that only requires T: Relate<'tcx>

pub fn sub<T>( self, define_opaque_types: DefineOpaqueTypes, expected: T, actual: T ) -> InferResult<'tcx, ()>

where T: ToTrace<'tcx>,

Makes expected <: actual.

See At::trace and Trace::sub for a version of this method that only requires T: Relate<'tcx>

pub fn eq<T>( self, define_opaque_types: DefineOpaqueTypes, expected: T, actual: T ) -> InferResult<'tcx, ()>

where T: ToTrace<'tcx>,

Makes expected <: actual.

See At::trace and Trace::eq for a version of this method that only requires T: Relate<'tcx>

pub fn relate<T>( self, define_opaque_types: DefineOpaqueTypes, expected: T, variance: Variance, actual: T ) -> InferResult<'tcx, ()>

where T: ToTrace<'tcx>,

pub fn lub<T>( self, define_opaque_types: DefineOpaqueTypes, expected: T, actual: T ) -> InferResult<'tcx, T>

where T: ToTrace<'tcx>,

Computes the least-upper-bound, or mutual supertype, of two values. The order of the arguments doesn’t matter, but since this can result in an error (e.g., if asked to compute LUB of u32 and i32), it is meaningful to call one of them the “expected type”.

See At::trace and Trace::lub for a version of this method that only requires T: Relate<'tcx>

pub fn glb<T>( self, define_opaque_types: DefineOpaqueTypes, expected: T, actual: T ) -> InferResult<'tcx, T>

where T: ToTrace<'tcx>,

Computes the greatest-lower-bound, or mutual subtype, of two values. As with lub order doesn’t matter, except for error cases.

See At::trace and Trace::glb for a version of this method that only requires T: Relate<'tcx>

pub fn trace<T>(self, expected: T, actual: T) -> Trace<'a, 'tcx>

where T: ToTrace<'tcx>,

Sets the “trace” values that will be used for error-reporting, but doesn’t actually perform any operation yet (this is useful when you want to set the trace using distinct values from those you wish to operate upon).

Trait Implementations

impl<'a, 'tcx> Clone for At<'a, 'tcx>

fn clone(&self) -> At<'a, 'tcx>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a, 'tcx> Copy for At<'a, 'tcx>

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 24 bytes