Make middle not rely on next_trait_solver

Author: compiler-errors

Cargo.lock

@@ -4198,7 +4198,6 @@ dependencies = [
  "rustc_hir_pretty",
  "rustc_index",
  "rustc_macros",
- "rustc_next_trait_solver",
  "rustc_query_system",
  "rustc_serialize",
  "rustc_session",

compiler/rustc_middle/Cargo.toml

@@ -28,7 +28,6 @@ rustc_hir = { path = "../rustc_hir" }
 rustc_hir_pretty = { path = "../rustc_hir_pretty" }
 rustc_index = { path = "../rustc_index" }
 rustc_macros = { path = "../rustc_macros" }
-rustc_next_trait_solver = { path = "../rustc_next_trait_solver" }
 rustc_query_system = { path = "../rustc_query_system" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_session = { path = "../rustc_session" }

compiler/rustc_middle/src/arena.rs

@@ -62,7 +62,7 @@ macro_rules! arena_types {
             [] candidate_step: rustc_middle::traits::query::CandidateStep<'tcx>,
             [] autoderef_bad_ty: rustc_middle::traits::query::MethodAutoderefBadTy<'tcx>,
             [] canonical_goal_evaluation:
-                rustc_next_trait_solver::solve::inspect::CanonicalGoalEvaluationStep<
+                rustc_type_ir::solve::inspect::CanonicalGoalEvaluationStep<
                     rustc_middle::ty::TyCtxt<'tcx>
                 >,
             [] query_region_constraints: rustc_middle::infer::canonical::QueryRegionConstraints<'tcx>,

compiler/rustc_middle/src/traits/mod.rs

@@ -32,7 +32,7 @@ use std::hash::{Hash, Hasher};
 
 pub use self::select::{EvaluationCache, EvaluationResult, OverflowError, SelectionCache};
 // FIXME: Remove this import and import via `solve::`
-pub use rustc_next_trait_solver::solve::BuiltinImplSource;
+pub use rustc_type_ir::solve::BuiltinImplSource;
 
 /// Depending on the stage of compilation, we want projection to be
 /// more or less conservative.

compiler/rustc_middle/src/traits/query.rs

@@ -13,7 +13,7 @@ use crate::ty::{self, Ty, TyCtxt};
 use rustc_macros::{HashStable, TypeFoldable, TypeVisitable};
 use rustc_span::Span;
 // FIXME: Remove this import and import via `traits::solve`.
-pub use rustc_next_trait_solver::solve::NoSolution;
+pub use rustc_type_ir::solve::NoSolution;
 
 pub mod type_op {
     use crate::ty::fold::TypeFoldable;

compiler/rustc_middle/src/traits/solve.rs

@@ -1,8 +1,8 @@
 use rustc_ast_ir::try_visit;
 use rustc_data_structures::intern::Interned;
 use rustc_macros::{HashStable, TypeFoldable, TypeVisitable};
-use rustc_next_trait_solver as ir;
-pub use rustc_next_trait_solver::solve::*;
+use rustc_type_ir as ir;
+pub use rustc_type_ir::solve::*;
 
 use crate::infer::canonical::QueryRegionConstraints;
 use crate::ty::{