Trait rustc_middle::ty::relate::TypeRelation

pub trait TypeRelation<I>: Sized
where
    I: Interner,
{
    // Required methods
    fn cx(&self) -> I;
    fn relate_with_variance<T>(
        &mut self,
        variance: Variance,
        info: VarianceDiagInfo<I>,
        a: T,
        b: T,
    ) -> Result<T, TypeError<I>>
       where T: Relate<I>;
    fn tys(
        &mut self,
        a: <I as Interner>::Ty,
        b: <I as Interner>::Ty,
    ) -> Result<<I as Interner>::Ty, TypeError<I>>;
    fn regions(
        &mut self,
        a: <I as Interner>::Region,
        b: <I as Interner>::Region,
    ) -> Result<<I as Interner>::Region, TypeError<I>>;
    fn consts(
        &mut self,
        a: <I as Interner>::Const,
        b: <I as Interner>::Const,
    ) -> Result<<I as Interner>::Const, TypeError<I>>;
    fn binders<T>(
        &mut self,
        a: Binder<I, T>,
        b: Binder<I, T>,
    ) -> Result<Binder<I, T>, TypeError<I>>
       where T: Relate<I>;

    // Provided methods
    fn relate<T>(&mut self, a: T, b: T) -> Result<T, TypeError<I>>
       where T: Relate<I> { ... }
    fn relate_item_args(
        &mut self,
        item_def_id: <I as Interner>::DefId,
        a_arg: <I as Interner>::GenericArgs,
        b_arg: <I as Interner>::GenericArgs,
    ) -> Result<<I as Interner>::GenericArgs, TypeError<I>> { ... }
}

Required Methods

fn cx(&self) -> I

fn relate_with_variance<T>( &mut self, variance: Variance, info: VarianceDiagInfo<I>, a: T, b: T, ) -> Result<T, TypeError<I>>

where T: Relate<I>,

Switch variance for the purpose of relating a and b.

fn tys( &mut self, a: <I as Interner>::Ty, b: <I as Interner>::Ty, ) -> Result<<I as Interner>::Ty, TypeError<I>>

fn regions( &mut self, a: <I as Interner>::Region, b: <I as Interner>::Region, ) -> Result<<I as Interner>::Region, TypeError<I>>

fn consts( &mut self, a: <I as Interner>::Const, b: <I as Interner>::Const, ) -> Result<<I as Interner>::Const, TypeError<I>>

fn binders<T>( &mut self, a: Binder<I, T>, b: Binder<I, T>, ) -> Result<Binder<I, T>, TypeError<I>>

where T: Relate<I>,

Provided Methods

fn relate<T>(&mut self, a: T, b: T) -> Result<T, TypeError<I>>

where T: Relate<I>,

Generic relation routine suitable for most anything.

fn relate_item_args( &mut self, item_def_id: <I as Interner>::DefId, a_arg: <I as Interner>::GenericArgs, b_arg: <I as Interner>::GenericArgs, ) -> Result<<I as Interner>::GenericArgs, TypeError<I>>

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