Struct rustc_hir_analysis::check::dropck::SimpleEqRelation

pub(crate) struct SimpleEqRelation<'tcx> {
    tcx: TyCtxt<'tcx>,
    param_env: ParamEnv<'tcx>,
}

This is an implementation of the TypeRelation trait with the aim of simply comparing for equality (without side-effects).

It is not intended to be used anywhere else other than here.

Fields

tcx: TyCtxt<'tcx>

param_env: ParamEnv<'tcx>

Implementations

impl<'tcx> SimpleEqRelation<'tcx>

fn new(tcx: TyCtxt<'tcx>, param_env: ParamEnv<'tcx>) -> SimpleEqRelation<'tcx>

Trait Implementations

impl<'tcx> TypeRelation<'tcx> for SimpleEqRelation<'tcx>

fn tcx(&self) -> TyCtxt<'tcx>

fn intercrate(&self) -> bool

fn param_env(&self) -> ParamEnv<'tcx>

fn tag(&self) -> &'static str

Returns a static string we can use for printouts.

fn a_is_expected(&self) -> bool

Returns true if the value a is the “expected” type in the relation. Just affects error messages.

fn mark_ambiguous(&mut self)

Used during coherence. If called, must emit an always-ambiguous obligation.

fn relate_with_variance<T: Relate<'tcx>>(
    &mut self,
    _: Variance,
    _info: VarianceDiagInfo<'tcx>,
    a: T,
    b: T
) -> RelateResult<'tcx, T>

Switch variance for the purpose of relating a and b.

fn tys(&mut self, a: Ty<'tcx>, b: Ty<'tcx>) -> RelateResult<'tcx, Ty<'tcx>>

fn regions(
    &mut self,
    a: Region<'tcx>,
    b: Region<'tcx>
) -> RelateResult<'tcx, Region<'tcx>>

fn consts(
    &mut self,
    a: Const<'tcx>,
    b: Const<'tcx>
) -> RelateResult<'tcx, Const<'tcx>>

fn binders<T>(
    &mut self,
    a: Binder<'tcx, T>,
    b: Binder<'tcx, T>
) -> RelateResult<'tcx, Binder<'tcx, T>>where
    T: Relate<'tcx>,

fn with_cause<F, R>(&mut self, _cause: Cause, f: F) -> Rwhere
    F: FnOnce(&mut Self) -> R,

fn relate<T>(&mut self, a: T, b: T) -> Result<T, TypeError<'tcx>>where
    T: Relate<'tcx>,

Generic relation routine suitable for most anything.

fn relate_item_substs(
    &mut self,
    item_def_id: DefId,
    a_subst: &'tcx List<GenericArg<'tcx>>,
    b_subst: &'tcx List<GenericArg<'tcx>>
) -> Result<&'tcx List<GenericArg<'tcx>>, TypeError<'tcx>>

Relate the two substitutions for the given item. The default is to look up the variance for the item and proceed accordingly.

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: 16 bytes