Trait rustc_middle::ty::relate::TypeRelation

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pub trait TypeRelation<'tcx>: Sized {
    // Required methods
    fn tcx(&self) -> TyCtxt<'tcx>;
    fn tag(&self) -> &'static str;
    fn relate_with_variance<T: Relate<'tcx>>(
        &mut self,
        variance: Variance,
        info: VarianceDiagInfo<'tcx>,
        a: T,
        b: T
    ) -> RelateResult<'tcx, T>;
    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>;

    // Provided methods
    fn relate<T: Relate<'tcx>>(&mut self, a: T, b: T) -> RelateResult<'tcx, T> { ... }
    fn relate_item_args(
        &mut self,
        item_def_id: DefId,
        a_arg: GenericArgsRef<'tcx>,
        b_arg: GenericArgsRef<'tcx>
    ) -> RelateResult<'tcx, GenericArgsRef<'tcx>> { ... }
}

Required Methods§

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

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

Returns a static string we can use for printouts.

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

Switch variance for the purpose of relating a and b.

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

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

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

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

Provided Methods§

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

Generic relation routine suitable for most anything.

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fn relate_item_args( &mut self, item_def_id: DefId, a_arg: GenericArgsRef<'tcx>, b_arg: GenericArgsRef<'tcx> ) -> RelateResult<'tcx, GenericArgsRef<'tcx>>

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

Object Safety§

This trait is not object safe.

Implementors§

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impl<'tcx> TypeRelation<'tcx> for MatchAgainstFreshVars<'tcx>