rustc_next_trait_solver::solve::eval_ctxt

Struct ReplaceAliasWithInfer

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struct ReplaceAliasWithInfer<'me, 'a, D, I>
where
    D: SolverDelegate<Interner = I>,
    I: Interner,
{
    ecx: &'me mut EvalCtxt<'a, D>,
    param_env: I::ParamEnv,
    cache: HashMap<I::Ty, I::Ty>,
}
Expand description

Eagerly replace aliases with inference variables, emitting AliasRelate goals, used when adding goals to the EvalCtxt. We compute the AliasRelate goals before evaluating the actual goal to get all the constraints we can.

This is a performance optimization to more eagerly detect cycles during trait solving. See tests/ui/traits/next-solver/cycles/cycle-modulo-ambig-aliases.rs.

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§ecx: &'me mut EvalCtxt<'a, D>§param_env: I::ParamEnv§cache: HashMap<I::Ty, I::Ty>

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impl<'me, 'a, D, I> ReplaceAliasWithInfer<'me, 'a, D, I>
where D: SolverDelegate<Interner = I>, I: Interner,

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fn new(ecx: &'me mut EvalCtxt<'a, D>, param_env: I::ParamEnv) -> Self

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impl<D, I> TypeFolder<I> for ReplaceAliasWithInfer<'_, '_, D, I>
where D: SolverDelegate<Interner = I>, I: Interner,

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fn cx(&self) -> I

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fn fold_ty(&mut self, ty: I::Ty) -> I::Ty

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fn fold_const(&mut self, ct: I::Const) -> I::Const

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fn fold_predicate(&mut self, predicate: I::Predicate) -> I::Predicate

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fn fold_binder<T>(&mut self, t: Binder<I, T>) -> Binder<I, T>
where T: TypeFoldable<I>,

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fn fold_region(&mut self, r: <I as Interner>::Region) -> <I as Interner>::Region

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impl<'me, 'a, D, I> DynSend for ReplaceAliasWithInfer<'me, 'a, D, I>
where <I as Interner>::ParamEnv: DynSend, <I as Interner>::Ty: DynSend, <I as Interner>::CanonicalVars: DynSend, <I as Interner>::PredefinedOpaques: DynSend, D: DynSync + DynSend, <I as Interner>::GenericArgs: DynSend, <I as Interner>::Term: DynSend, <I as Interner>::Predicate: DynSend, <I as Interner>::DefiningOpaqueTypes: DynSend, <I as Interner>::DefId: DynSend, <I as Interner>::GenericArg: DynSend, <I as Interner>::ExternalConstraints: DynSend,

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impl<'me, 'a, D, I> DynSync for ReplaceAliasWithInfer<'me, 'a, D, I>
where <I as Interner>::ParamEnv: DynSync, <I as Interner>::Ty: DynSync, <I as Interner>::CanonicalVars: DynSync, <I as Interner>::PredefinedOpaques: DynSync, D: DynSync, <I as Interner>::GenericArgs: DynSync, <I as Interner>::Term: DynSync, <I as Interner>::Predicate: DynSync, <I as Interner>::DefiningOpaqueTypes: DynSync, <I as Interner>::DefId: DynSync, <I as Interner>::GenericArg: DynSync, <I as Interner>::ExternalConstraints: DynSync,

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impl<'me, 'a, D, I> Freeze for ReplaceAliasWithInfer<'me, 'a, D, I>
where <I as Interner>::ParamEnv: Freeze,

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impl<'me, 'a, D, I> RefUnwindSafe for ReplaceAliasWithInfer<'me, 'a, D, I>
where <I as Interner>::ParamEnv: RefUnwindSafe, <I as Interner>::CanonicalVars: RefUnwindSafe, <I as Interner>::PredefinedOpaques: RefUnwindSafe, D: RefUnwindSafe, <I as Interner>::GenericArgs: RefUnwindSafe, <I as Interner>::Ty: RefUnwindSafe, <I as Interner>::Term: RefUnwindSafe, <I as Interner>::Predicate: RefUnwindSafe, <I as Interner>::DefId: RefUnwindSafe, <I as Interner>::DefiningOpaqueTypes: RefUnwindSafe, <I as Interner>::GenericArg: RefUnwindSafe, <I as Interner>::ExternalConstraints: RefUnwindSafe,

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impl<'me, 'a, D, I> Send for ReplaceAliasWithInfer<'me, 'a, D, I>
where <I as Interner>::ParamEnv: Send, <I as Interner>::CanonicalVars: Send, <I as Interner>::PredefinedOpaques: Send, D: Sync + Send, <I as Interner>::GenericArgs: Send, <I as Interner>::Ty: Send, <I as Interner>::DefiningOpaqueTypes: Send, <I as Interner>::Term: Send, <I as Interner>::Predicate: Send, <I as Interner>::DefId: Send, <I as Interner>::ExternalConstraints: Send, <I as Interner>::GenericArg: Send,

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impl<'me, 'a, D, I> Sync for ReplaceAliasWithInfer<'me, 'a, D, I>
where <I as Interner>::ParamEnv: Sync, <I as Interner>::CanonicalVars: Sync, <I as Interner>::PredefinedOpaques: Sync, D: Sync, <I as Interner>::GenericArgs: Sync, <I as Interner>::Ty: Sync, <I as Interner>::Term: Sync, <I as Interner>::Predicate: Sync, <I as Interner>::DefId: Sync, <I as Interner>::DefiningOpaqueTypes: Sync, <I as Interner>::GenericArg: Sync, <I as Interner>::ExternalConstraints: Sync,

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impl<'me, 'a, D, I> Unpin for ReplaceAliasWithInfer<'me, 'a, D, I>
where <I as Interner>::ParamEnv: Unpin, <I as Interner>::Ty: Unpin,

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impl<'me, 'a, D, I> !UnwindSafe for ReplaceAliasWithInfer<'me, 'a, D, I>

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<I, F> FallibleTypeFolder<I> for F
where I: Interner, F: TypeFolder<I>,

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type Error = !

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fn cx(&self) -> I

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fn try_fold_binder<T>(&mut self, t: Binder<I, T>) -> Result<Binder<I, T>, !>
where T: TypeFoldable<I>,

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fn try_fold_ty( &mut self, t: <I as Interner>::Ty, ) -> Result<<I as Interner>::Ty, !>

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fn try_fold_region( &mut self, r: <I as Interner>::Region, ) -> Result<<I as Interner>::Region, !>

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fn try_fold_const( &mut self, c: <I as Interner>::Const, ) -> Result<<I as Interner>::Const, !>

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fn try_fold_predicate( &mut self, p: <I as Interner>::Predicate, ) -> Result<<I as Interner>::Predicate, !>

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