# Trait rustc_infer::infer::at::ToTrace

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    pub trait ToTrace<'tcx>: Relate<'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: Self, b: Self ) -> 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: Self, b: Self ) -> 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: Self, b: Self ) -> TypeTrace<'tcx>

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

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

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

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

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

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

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

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

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

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

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

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

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

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

## Implementors§