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.

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

where T: ToTrace<'tcx>,

Makes expected <: actual.

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

where T: ToTrace<'tcx>,

Makes expected == actual.

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

where T: ToTrace<'tcx>,

Equates expected and found while structurally relating aliases. This should only be used inside of the next generation trait solver when relating rigid aliases.

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

where T: ToTrace<'tcx>,

pub fn relate_no_trace<T>( self, expected: T, variance: Variance, actual: T, ) -> Result<Vec<Goal<'tcx, Predicate<'tcx>>>, NoSolution>

where T: Relate<TyCtxt<'tcx>>,

Used in the new solver since we don’t care about tracking an ObligationCause.

pub fn eq_structurally_relating_aliases_no_trace<T>( self, expected: T, actual: T, ) -> Result<Vec<Goal<'tcx, Predicate<'tcx>>>, NoSolution>

where T: Relate<TyCtxt<'tcx>>,

Used in the new solver since we don’t care about tracking an ObligationCause.

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”.

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.

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