diff options
Diffstat (limited to 'compiler/rustc_trait_selection/src/solve/assembly/mod.rs')
| -rw-r--r-- | compiler/rustc_trait_selection/src/solve/assembly/mod.rs | 78 |
1 files changed, 9 insertions, 69 deletions
diff --git a/compiler/rustc_trait_selection/src/solve/assembly/mod.rs b/compiler/rustc_trait_selection/src/solve/assembly/mod.rs index 36194f973..23d2c0c4e 100644 --- a/compiler/rustc_trait_selection/src/solve/assembly/mod.rs +++ b/compiler/rustc_trait_selection/src/solve/assembly/mod.rs @@ -5,8 +5,10 @@ use crate::traits::coherence; use rustc_hir::def_id::DefId; use rustc_infer::traits::query::NoSolution; use rustc_infer::traits::Reveal; -use rustc_middle::traits::solve::inspect::CandidateKind; -use rustc_middle::traits::solve::{CanonicalResponse, Certainty, Goal, QueryResult}; +use rustc_middle::traits::solve::inspect::ProbeKind; +use rustc_middle::traits::solve::{ + CandidateSource, CanonicalResponse, Certainty, Goal, QueryResult, +}; use rustc_middle::traits::BuiltinImplSource; use rustc_middle::ty::fast_reject::{SimplifiedType, TreatParams}; use rustc_middle::ty::{self, Ty, TyCtxt}; @@ -27,66 +29,6 @@ pub(super) struct Candidate<'tcx> { pub(super) result: CanonicalResponse<'tcx>, } -/// Possible ways the given goal can be proven. -#[derive(Debug, Clone, Copy)] -pub(super) enum CandidateSource { - /// A user written impl. - /// - /// ## Examples - /// - /// ```rust - /// fn main() { - /// let x: Vec<u32> = Vec::new(); - /// // This uses the impl from the standard library to prove `Vec<T>: Clone`. - /// let y = x.clone(); - /// } - /// ``` - Impl(DefId), - /// A builtin impl generated by the compiler. When adding a new special - /// trait, try to use actual impls whenever possible. Builtin impls should - /// only be used in cases where the impl cannot be manually be written. - /// - /// Notable examples are auto traits, `Sized`, and `DiscriminantKind`. - /// For a list of all traits with builtin impls, check out the - /// [`EvalCtxt::assemble_builtin_impl_candidates`] method. Not - BuiltinImpl(BuiltinImplSource), - /// An assumption from the environment. - /// - /// More precisely we've used the `n-th` assumption in the `param_env`. - /// - /// ## Examples - /// - /// ```rust - /// fn is_clone<T: Clone>(x: T) -> (T, T) { - /// // This uses the assumption `T: Clone` from the `where`-bounds - /// // to prove `T: Clone`. - /// (x.clone(), x) - /// } - /// ``` - ParamEnv(usize), - /// If the self type is an alias type, e.g. an opaque type or a projection, - /// we know the bounds on that alias to hold even without knowing its concrete - /// underlying type. - /// - /// More precisely this candidate is using the `n-th` bound in the `item_bounds` of - /// the self type. - /// - /// ## Examples - /// - /// ```rust - /// trait Trait { - /// type Assoc: Clone; - /// } - /// - /// fn foo<T: Trait>(x: <T as Trait>::Assoc) { - /// // We prove `<T as Trait>::Assoc` by looking at the bounds on `Assoc` in - /// // in the trait definition. - /// let _y = x.clone(); - /// } - /// ``` - AliasBound, -} - /// Methods used to assemble candidates for either trait or projection goals. pub(super) trait GoalKind<'tcx>: TypeFoldable<TyCtxt<'tcx>> + Copy + Eq + std::fmt::Display @@ -399,7 +341,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> { let tcx = self.tcx(); let &ty::Alias(_, projection_ty) = goal.predicate.self_ty().kind() else { return }; - candidates.extend(self.probe(|_| CandidateKind::NormalizedSelfTyAssembly).enter(|ecx| { + candidates.extend(self.probe(|_| ProbeKind::NormalizedSelfTyAssembly).enter(|ecx| { if num_steps < ecx.local_overflow_limit() { let normalized_ty = ecx.next_ty_infer(); let normalizes_to_goal = goal.with( @@ -527,7 +469,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> { // FIXME: These should ideally not exist as a self type. It would be nice for // the builtin auto trait impls of generators to instead directly recurse // into the witness. - ty::GeneratorWitness(_) | ty::GeneratorWitnessMIR(_, _) => (), + ty::GeneratorWitness(..) => (), // These variants should not exist as a self type. ty::Infer(ty::TyVar(_) | ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) @@ -679,8 +621,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> { | ty::Dynamic(..) | ty::Closure(..) | ty::Generator(..) - | ty::GeneratorWitness(_) - | ty::GeneratorWitnessMIR(..) + | ty::GeneratorWitness(..) | ty::Never | ty::Tuple(_) | ty::Param(_) @@ -836,8 +777,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> { | ty::Alias(..) | ty::Closure(..) | ty::Generator(..) - | ty::GeneratorWitness(_) - | ty::GeneratorWitnessMIR(..) + | ty::GeneratorWitness(..) | ty::Never | ty::Tuple(_) | ty::Param(_) @@ -910,7 +850,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> { SolverMode::Coherence => {} }; - let result = self.probe_candidate("coherence unknowable").enter(|ecx| { + let result = self.probe_misc_candidate("coherence unknowable").enter(|ecx| { let trait_ref = goal.predicate.trait_ref(tcx); #[derive(Debug)] |