Fallible<_> -> Result<_, NoSolution>

compiler/rustc_trait_selection/src/infer.rs

@@ -5,7 +5,7 @@ use rustc_hir::def_id::DefId;
 use rustc_hir::lang_items::LangItem;
 use rustc_middle::arena::ArenaAllocatable;
 use rustc_middle::infer::canonical::{Canonical, CanonicalQueryResponse, QueryResponse};
-use rustc_middle::traits::query::Fallible;
+use rustc_middle::traits::query::NoSolution;
 use rustc_middle::ty::{self, Ty, TyCtxt, TypeFoldable, TypeVisitableExt};
 use rustc_middle::ty::{GenericArg, ToPredicate};
 use rustc_span::DUMMY_SP;
@@ -82,8 +82,8 @@ pub trait InferCtxtBuilderExt<'tcx> {
     fn enter_canonical_trait_query<K, R>(
         &mut self,
         canonical_key: &Canonical<'tcx, K>,
-        operation: impl FnOnce(&ObligationCtxt<'_, 'tcx>, K) -> Fallible<R>,
-    ) -> Fallible<CanonicalQueryResponse<'tcx, R>>
+        operation: impl FnOnce(&ObligationCtxt<'_, 'tcx>, K) -> Result<R, NoSolution>,
+    ) -> Result<CanonicalQueryResponse<'tcx, R>, NoSolution>
     where
         K: TypeFoldable<TyCtxt<'tcx>>,
         R: Debug + TypeFoldable<TyCtxt<'tcx>>,
@@ -110,8 +110,8 @@ impl<'tcx> InferCtxtBuilderExt<'tcx> for InferCtxtBuilder<'tcx> {
     fn enter_canonical_trait_query<K, R>(
         &mut self,
         canonical_key: &Canonical<'tcx, K>,
-        operation: impl FnOnce(&ObligationCtxt<'_, 'tcx>, K) -> Fallible<R>,
-    ) -> Fallible<CanonicalQueryResponse<'tcx, R>>
+        operation: impl FnOnce(&ObligationCtxt<'_, 'tcx>, K) -> Result<R, NoSolution>,
+    ) -> Result<CanonicalQueryResponse<'tcx, R>, NoSolution>
     where
         K: TypeFoldable<TyCtxt<'tcx>>,
         R: Debug + TypeFoldable<TyCtxt<'tcx>>,

compiler/rustc_trait_selection/src/traits/engine.rs

@@ -14,11 +14,11 @@ use rustc_infer::infer::canonical::{
 };
 use rustc_infer::infer::outlives::env::OutlivesEnvironment;
 use rustc_infer::infer::{DefineOpaqueTypes, InferCtxt, InferOk};
-use rustc_infer::traits::query::Fallible;
 use rustc_infer::traits::{
     FulfillmentError, Obligation, ObligationCause, PredicateObligation, TraitEngineExt as _,
 };
 use rustc_middle::arena::ArenaAllocatable;
+use rustc_middle::traits::query::NoSolution;
 use rustc_middle::ty::error::TypeError;
 use rustc_middle::ty::ToPredicate;
 use rustc_middle::ty::TypeFoldable;
@@ -235,7 +235,7 @@ impl<'a, 'tcx> ObligationCtxt<'a, 'tcx> {
         &self,
         inference_vars: CanonicalVarValues<'tcx>,
         answer: T,
-    ) -> Fallible<CanonicalQueryResponse<'tcx, T>>
+    ) -> Result<CanonicalQueryResponse<'tcx, T>, NoSolution>
     where
         T: Debug + TypeFoldable<TyCtxt<'tcx>>,
         Canonical<'tcx, QueryResponse<'tcx, T>>: ArenaAllocatable<'tcx>,

compiler/rustc_trait_selection/src/traits/query/type_op/ascribe_user_type.rs

@@ -1,5 +1,5 @@
 use crate::infer::canonical::{Canonical, CanonicalQueryResponse};
-use crate::traits::query::Fallible;
+use rustc_middle::traits::query::NoSolution;
 use rustc_middle::ty::{ParamEnvAnd, TyCtxt};
 
 pub use rustc_middle::traits::query::type_op::AscribeUserType;
@@ -17,7 +17,7 @@ impl<'tcx> super::QueryTypeOp<'tcx> for AscribeUserType<'tcx> {
     fn perform_query(
         tcx: TyCtxt<'tcx>,
         canonicalized: Canonical<'tcx, ParamEnvAnd<'tcx, Self>>,
-    ) -> Fallible<CanonicalQueryResponse<'tcx, ()>> {
+    ) -> Result<CanonicalQueryResponse<'tcx, ()>, NoSolution> {
         tcx.type_op_ascribe_user_type(canonicalized)
     }
 }

compiler/rustc_trait_selection/src/traits/query/type_op/custom.rs

@@ -1,10 +1,10 @@
 use crate::infer::canonical::query_response;
 use crate::infer::InferCtxt;
 use crate::traits::query::type_op::TypeOpOutput;
-use crate::traits::query::Fallible;
 use crate::traits::ObligationCtxt;
 use rustc_errors::ErrorGuaranteed;
 use rustc_infer::infer::region_constraints::RegionConstraintData;
+use rustc_middle::traits::query::NoSolution;
 use rustc_span::source_map::DUMMY_SP;
 use rustc_span::Span;
 
@@ -18,7 +18,7 @@ pub struct CustomTypeOp<F> {
 impl<F> CustomTypeOp<F> {
     pub fn new<'tcx, R>(closure: F, description: &'static str) -> Self
     where
-        F: FnOnce(&ObligationCtxt<'_, 'tcx>) -> Fallible<R>,
+        F: FnOnce(&ObligationCtxt<'_, 'tcx>) -> Result<R, NoSolution>,
     {
         CustomTypeOp { closure, description }
     }
@@ -26,7 +26,7 @@ impl<F> CustomTypeOp<F> {
 
 impl<'tcx, F, R: fmt::Debug> super::TypeOp<'tcx> for CustomTypeOp<F>
 where
-    F: FnOnce(&ObligationCtxt<'_, 'tcx>) -> Fallible<R>,
+    F: FnOnce(&ObligationCtxt<'_, 'tcx>) -> Result<R, NoSolution>,
 {
     type Output = R;
     /// We can't do any custom error reporting for `CustomTypeOp`, so
@@ -59,7 +59,7 @@ impl<F> fmt::Debug for CustomTypeOp<F> {
 /// constraints that result, creating query-region-constraints.
 pub fn scrape_region_constraints<'tcx, Op: super::TypeOp<'tcx, Output = R>, R>(
     infcx: &InferCtxt<'tcx>,
-    op: impl FnOnce(&ObligationCtxt<'_, 'tcx>) -> Fallible<R>,
+    op: impl FnOnce(&ObligationCtxt<'_, 'tcx>) -> Result<R, NoSolution>,
     name: &'static str,
     span: Span,
 ) -> Result<(TypeOpOutput<'tcx, Op>, RegionConstraintData<'tcx>), ErrorGuaranteed> {

compiler/rustc_trait_selection/src/traits/query/type_op/eq.rs

@@ -1,5 +1,5 @@
 use crate::infer::canonical::{Canonical, CanonicalQueryResponse};
-use crate::traits::query::Fallible;
+use rustc_middle::traits::query::NoSolution;
 use rustc_middle::ty::{ParamEnvAnd, TyCtxt};
 
 pub use rustc_middle::traits::query::type_op::Eq;
@@ -17,7 +17,7 @@ impl<'tcx> super::QueryTypeOp<'tcx> for Eq<'tcx> {
     fn perform_query(
         tcx: TyCtxt<'tcx>,
         canonicalized: Canonical<'tcx, ParamEnvAnd<'tcx, Self>>,
-    ) -> Fallible<CanonicalQueryResponse<'tcx, ()>> {
+    ) -> Result<CanonicalQueryResponse<'tcx, ()>, NoSolution> {
         tcx.type_op_eq(canonicalized)
     }
 }

compiler/rustc_trait_selection/src/traits/query/type_op/implied_outlives_bounds.rs

@@ -1,6 +1,6 @@
 use crate::infer::canonical::{Canonical, CanonicalQueryResponse};
-use crate::traits::query::Fallible;
 use rustc_infer::traits::query::OutlivesBound;
+use rustc_middle::traits::query::NoSolution;
 use rustc_middle::ty::{self, ParamEnvAnd, Ty, TyCtxt};
 
 #[derive(Copy, Clone, Debug, HashStable, TypeFoldable, TypeVisitable, Lift)]
@@ -28,7 +28,7 @@ impl<'tcx> super::QueryTypeOp<'tcx> for ImpliedOutlivesBounds<'tcx> {
     fn perform_query(
         tcx: TyCtxt<'tcx>,
         canonicalized: Canonical<'tcx, ParamEnvAnd<'tcx, Self>>,
-    ) -> Fallible<CanonicalQueryResponse<'tcx, Self::QueryResponse>> {
+    ) -> Result<CanonicalQueryResponse<'tcx, Self::QueryResponse>, NoSolution> {
         // FIXME this `unchecked_map` is only necessary because the
         // query is defined as taking a `ParamEnvAnd<Ty>`; it should
         // take an `ImpliedOutlivesBounds` instead

compiler/rustc_trait_selection/src/traits/query/type_op/mod.rs

@@ -2,11 +2,11 @@ use crate::infer::canonical::{
     Canonical, CanonicalQueryResponse, OriginalQueryValues, QueryRegionConstraints,
 };
 use crate::infer::{InferCtxt, InferOk};
-use crate::traits::query::Fallible;
 use crate::traits::ObligationCause;
 use rustc_errors::ErrorGuaranteed;
 use rustc_infer::infer::canonical::Certainty;
 use rustc_infer::traits::PredicateObligations;
+use rustc_middle::traits::query::NoSolution;
 use rustc_middle::ty::fold::TypeFoldable;
 use rustc_middle::ty::{ParamEnvAnd, TyCtxt};
 use rustc_span::Span;
@@ -79,18 +79,21 @@ pub trait QueryTypeOp<'tcx>: fmt::Debug + Copy + TypeFoldable<TyCtxt<'tcx>> + 't
     fn perform_query(
         tcx: TyCtxt<'tcx>,
         canonicalized: Canonical<'tcx, ParamEnvAnd<'tcx, Self>>,
-    ) -> Fallible<CanonicalQueryResponse<'tcx, Self::QueryResponse>>;
+    ) -> Result<CanonicalQueryResponse<'tcx, Self::QueryResponse>, NoSolution>;
 
     fn fully_perform_into(
         query_key: ParamEnvAnd<'tcx, Self>,
         infcx: &InferCtxt<'tcx>,
         output_query_region_constraints: &mut QueryRegionConstraints<'tcx>,
-    ) -> Fallible<(
-        Self::QueryResponse,
-        Option<Canonical<'tcx, ParamEnvAnd<'tcx, Self>>>,
-        PredicateObligations<'tcx>,
-        Certainty,
-    )> {
+    ) -> Result<
+        (
+            Self::QueryResponse,
+            Option<Canonical<'tcx, ParamEnvAnd<'tcx, Self>>>,
+            PredicateObligations<'tcx>,
+            Certainty,
+        ),
+        NoSolution,
+    > {
         if let Some(result) = QueryTypeOp::try_fast_path(infcx.tcx, &query_key) {
             return Ok((result, None, vec![], Certainty::Proven));
         }

compiler/rustc_trait_selection/src/traits/query/type_op/normalize.rs

@@ -1,5 +1,5 @@
 use crate::infer::canonical::{Canonical, CanonicalQueryResponse};
-use crate::traits::query::Fallible;
+use rustc_middle::traits::query::NoSolution;
 use rustc_middle::ty::fold::TypeFoldable;
 use rustc_middle::ty::{self, Lift, ParamEnvAnd, Ty, TyCtxt, TypeVisitableExt};
 use std::fmt;
@@ -19,7 +19,7 @@ where
     fn perform_query(
         tcx: TyCtxt<'tcx>,
         canonicalized: Canonical<'tcx, ParamEnvAnd<'tcx, Self>>,
-    ) -> Fallible<CanonicalQueryResponse<'tcx, Self::QueryResponse>> {
+    ) -> Result<CanonicalQueryResponse<'tcx, Self::QueryResponse>, NoSolution> {
         T::type_op_method(tcx, canonicalized)
     }
 }
@@ -28,14 +28,14 @@ pub trait Normalizable<'tcx>: fmt::Debug + TypeFoldable<TyCtxt<'tcx>> + Lift<'tc
     fn type_op_method(
         tcx: TyCtxt<'tcx>,
         canonicalized: Canonical<'tcx, ParamEnvAnd<'tcx, Normalize<Self>>>,
-    ) -> Fallible<CanonicalQueryResponse<'tcx, Self>>;
+    ) -> Result<CanonicalQueryResponse<'tcx, Self>, NoSolution>;
 }
 
 impl<'tcx> Normalizable<'tcx> for Ty<'tcx> {
     fn type_op_method(
         tcx: TyCtxt<'tcx>,
         canonicalized: Canonical<'tcx, ParamEnvAnd<'tcx, Normalize<Self>>>,
-    ) -> Fallible<CanonicalQueryResponse<'tcx, Self>> {
+    ) -> Result<CanonicalQueryResponse<'tcx, Self>, NoSolution> {
         tcx.type_op_normalize_ty(canonicalized)
     }
 }
@@ -44,7 +44,7 @@ impl<'tcx> Normalizable<'tcx> for ty::Predicate<'tcx> {
     fn type_op_method(
         tcx: TyCtxt<'tcx>,
         canonicalized: Canonical<'tcx, ParamEnvAnd<'tcx, Normalize<Self>>>,
-    ) -> Fallible<CanonicalQueryResponse<'tcx, Self>> {
+    ) -> Result<CanonicalQueryResponse<'tcx, Self>, NoSolution> {
         tcx.type_op_normalize_predicate(canonicalized)
     }
 }
@@ -53,7 +53,7 @@ impl<'tcx> Normalizable<'tcx> for ty::PolyFnSig<'tcx> {
     fn type_op_method(
         tcx: TyCtxt<'tcx>,
         canonicalized: Canonical<'tcx, ParamEnvAnd<'tcx, Normalize<Self>>>,
-    ) -> Fallible<CanonicalQueryResponse<'tcx, Self>> {
+    ) -> Result<CanonicalQueryResponse<'tcx, Self>, NoSolution> {
         tcx.type_op_normalize_poly_fn_sig(canonicalized)
     }
 }
@@ -62,7 +62,7 @@ impl<'tcx> Normalizable<'tcx> for ty::FnSig<'tcx> {
     fn type_op_method(
         tcx: TyCtxt<'tcx>,
         canonicalized: Canonical<'tcx, ParamEnvAnd<'tcx, Normalize<Self>>>,
-    ) -> Fallible<CanonicalQueryResponse<'tcx, Self>> {
+    ) -> Result<CanonicalQueryResponse<'tcx, Self>, NoSolution> {
         tcx.type_op_normalize_fn_sig(canonicalized)
     }
 }

compiler/rustc_trait_selection/src/traits/query/type_op/outlives.rs

@@ -1,6 +1,6 @@
 use crate::infer::canonical::{Canonical, CanonicalQueryResponse};
 use crate::traits::query::dropck_outlives::{trivial_dropck_outlives, DropckOutlivesResult};
-use crate::traits::query::Fallible;
+use rustc_middle::traits::query::NoSolution;
 use rustc_middle::ty::{ParamEnvAnd, Ty, TyCtxt};
 
 #[derive(Copy, Clone, Debug, HashStable, TypeFoldable, TypeVisitable, Lift)]
@@ -27,7 +27,7 @@ impl<'tcx> super::QueryTypeOp<'tcx> for DropckOutlives<'tcx> {
     fn perform_query(
         tcx: TyCtxt<'tcx>,
         canonicalized: Canonical<'tcx, ParamEnvAnd<'tcx, Self>>,
-    ) -> Fallible<CanonicalQueryResponse<'tcx, Self::QueryResponse>> {
+    ) -> Result<CanonicalQueryResponse<'tcx, Self::QueryResponse>, NoSolution> {
         // Subtle: note that we are not invoking
         // `infcx.at(...).dropck_outlives(...)` here, but rather the
         // underlying `dropck_outlives` query. This same underlying

compiler/rustc_trait_selection/src/traits/query/type_op/prove_predicate.rs

@@ -1,5 +1,5 @@
 use crate::infer::canonical::{Canonical, CanonicalQueryResponse};
-use crate::traits::query::Fallible;
+use rustc_middle::traits::query::NoSolution;
 use rustc_middle::ty::{self, ParamEnvAnd, TyCtxt};
 
 pub use rustc_middle::traits::query::type_op::ProvePredicate;
@@ -33,7 +33,7 @@ impl<'tcx> super::QueryTypeOp<'tcx> for ProvePredicate<'tcx> {
     fn perform_query(
         tcx: TyCtxt<'tcx>,
         canonicalized: Canonical<'tcx, ParamEnvAnd<'tcx, Self>>,
-    ) -> Fallible<CanonicalQueryResponse<'tcx, ()>> {
+    ) -> Result<CanonicalQueryResponse<'tcx, ()>, NoSolution> {
         tcx.type_op_prove_predicate(canonicalized)
     }
 }

compiler/rustc_trait_selection/src/traits/query/type_op/subtype.rs

@@ -1,5 +1,5 @@
 use crate::infer::canonical::{Canonical, CanonicalQueryResponse};
-use crate::traits::query::Fallible;
+use rustc_middle::traits::query::NoSolution;
 use rustc_middle::ty::{ParamEnvAnd, TyCtxt};
 
 pub use rustc_middle::traits::query::type_op::Subtype;
@@ -14,7 +14,7 @@ impl<'tcx> super::QueryTypeOp<'tcx> for Subtype<'tcx> {
     fn perform_query(
         tcx: TyCtxt<'tcx>,
         canonicalized: Canonical<'tcx, ParamEnvAnd<'tcx, Self>>,
-    ) -> Fallible<CanonicalQueryResponse<'tcx, ()>> {
+    ) -> Result<CanonicalQueryResponse<'tcx, ()>, NoSolution> {
         tcx.type_op_subtype(canonicalized)
     }
 }