# Trait rustc_trait_selection::infer::at::ToTrace

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    pub trait ToTrace<'tcx>: Relate<TyCtxt<'tcx>> + Copy {
        // Required method
        fn to_trace(
            cause: &ObligationCause<'tcx>,
            a_is_expected: bool,
            a: Self,
            b: Self,
        ) -> TypeTrace<'tcx>;
    }

## Required Methods§

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#### fn to_trace( cause: &ObligationCause<'tcx>, a_is_expected: bool, a: Self, b: Self, ) -> TypeTrace<'tcx>

## Object Safety§

This trait is not object safe.

## Implementations on Foreign Types§

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### impl<'tcx> ToTrace<'tcx> for ImplSubject<'tcx>

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#### fn to_trace( cause: &ObligationCause<'tcx>, a_is_expected: bool, a: ImplSubject<'tcx>, b: ImplSubject<'tcx>, ) -> TypeTrace<'tcx>

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### impl<'tcx> ToTrace<'tcx> for Const<'tcx>

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#### fn to_trace( cause: &ObligationCause<'tcx>, a_is_expected: bool, a: Const<'tcx>, b: Const<'tcx>, ) -> TypeTrace<'tcx>

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### impl<'tcx> ToTrace<'tcx> for GenericArg<'tcx>

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#### fn to_trace( cause: &ObligationCause<'tcx>, a_is_expected: bool, a: GenericArg<'tcx>, b: GenericArg<'tcx>, ) -> TypeTrace<'tcx>

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### impl<'tcx> ToTrace<'tcx> for Region<'tcx>

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#### fn to_trace( cause: &ObligationCause<'tcx>, a_is_expected: bool, a: Region<'tcx>, b: Region<'tcx>, ) -> TypeTrace<'tcx>

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### impl<'tcx> ToTrace<'tcx> for Term<'tcx>

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#### fn to_trace( cause: &ObligationCause<'tcx>, a_is_expected: bool, a: Term<'tcx>, b: Term<'tcx>, ) -> TypeTrace<'tcx>

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### impl<'tcx> ToTrace<'tcx> for Ty<'tcx>

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#### fn to_trace( cause: &ObligationCause<'tcx>, a_is_expected: bool, a: Ty<'tcx>, b: Ty<'tcx>, ) -> TypeTrace<'tcx>

## Implementors§

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### impl<'tcx> ToTrace<'tcx> for AliasTerm<TyCtxt<'tcx>>

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### impl<'tcx> ToTrace<'tcx> for AliasTy<TyCtxt<'tcx>>

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### impl<'tcx> ToTrace<'tcx> for Binder<TyCtxt<'tcx>, ExistentialProjection<TyCtxt<'tcx>>>

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### impl<'tcx> ToTrace<'tcx> for Binder<TyCtxt<'tcx>, ExistentialTraitRef<TyCtxt<'tcx>>>

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### impl<'tcx> ToTrace<'tcx> for Binder<TyCtxt<'tcx>, FnSig<TyCtxt<'tcx>>>

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### impl<'tcx> ToTrace<'tcx> for FnSig<TyCtxt<'tcx>>

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### impl<'tcx> ToTrace<'tcx> for TraitRef<TyCtxt<'tcx>>