Remove more unused Lift impls.

Author: nnethercote

compiler/rustc_infer/src/infer/free_regions.rs

@@ -4,7 +4,7 @@
 //! and use that to decide when one free region outlives another, and so forth.
 
 use rustc_data_structures::transitive_relation::TransitiveRelation;
-use rustc_middle::ty::{Lift, Region, TyCtxt};
+use rustc_middle::ty::{Region, TyCtxt};
 
 /// Combines a `FreeRegionMap` and a `TyCtxt`.
 ///
@@ -101,10 +101,3 @@ impl<'tcx> FreeRegionMap<'tcx> {
         result
     }
 }
-
-impl<'a, 'tcx> Lift<'tcx> for FreeRegionMap<'a> {
-    type Lifted = FreeRegionMap<'tcx>;
-    fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<FreeRegionMap<'tcx>> {
-        self.relation.maybe_map(|fr| tcx.lift(fr)).map(|relation| FreeRegionMap { relation })
-    }
-}

compiler/rustc_middle/src/infer/canonical.rs

@@ -432,7 +432,7 @@ impl<'tcx, V> Canonical<'tcx, V> {
 pub type QueryOutlivesConstraint<'tcx> =
     (ty::OutlivesPredicate<GenericArg<'tcx>, Region<'tcx>>, ConstraintCategory<'tcx>);
 
-TrivialTypeTraversalAndLiftImpls! {
+TrivialTypeTraversalImpls! {
     crate::infer::canonical::Certainty,
     crate::infer::canonical::CanonicalTyVarKind,
 }

compiler/rustc_middle/src/mir/basic_blocks.rs

@@ -178,7 +178,7 @@ impl<'tcx> graph::WithPredecessors for BasicBlocks<'tcx> {
     }
 }
 
-TrivialTypeTraversalAndLiftImpls! { Cache }
+TrivialTypeTraversalImpls! { Cache }
 
 impl<S: Encoder> Encodable<S> for Cache {
     #[inline]

compiler/rustc_middle/src/mir/interpret/error.rs

@@ -67,7 +67,7 @@ impl Into<ErrorGuaranteed> for ReportedErrorInfo {
     }
 }
 
-TrivialTypeTraversalAndLiftImpls! { ErrorHandled }
+TrivialTypeTraversalImpls! { ErrorHandled }
 
 pub type EvalToAllocationRawResult<'tcx> = Result<ConstAlloc<'tcx>, ErrorHandled>;
 pub type EvalToConstValueResult<'tcx> = Result<ConstValue<'tcx>, ErrorHandled>;

compiler/rustc_middle/src/mir/mod.rs

@@ -744,7 +744,7 @@ pub enum BindingForm<'tcx> {
     RefForGuard,
 }
 
-TrivialTypeTraversalAndLiftImpls! { BindingForm<'tcx> }
+TrivialTypeTraversalImpls! { BindingForm<'tcx> }
 
 mod binding_form_impl {
     use rustc_data_structures::stable_hasher::{HashStable, StableHasher};

compiler/rustc_middle/src/mir/type_foldable.rs

@@ -5,7 +5,7 @@ use rustc_ast::InlineAsmTemplatePiece;
 use super::*;
 use crate::ty;
 
-TrivialTypeTraversalAndLiftImpls! {
+TrivialTypeTraversalImpls! {
     BlockTailInfo,
     MirPhase,
     SourceInfo,

compiler/rustc_middle/src/traits/mod.rs

@@ -13,7 +13,7 @@ use crate::infer::canonical::Canonical;
 use crate::mir::ConstraintCategory;
 use crate::ty::abstract_const::NotConstEvaluatable;
 use crate::ty::GenericArgsRef;
-use crate::ty::{self, AdtKind, Ty, TyCtxt};
+use crate::ty::{self, AdtKind, Ty};
 
 use rustc_data_structures::sync::Lrc;
 use rustc_errors::{Applicability, Diagnostic};
@@ -524,13 +524,6 @@ pub enum StatementAsExpression {
     NeedsBoxing,
 }
 
-impl<'tcx> ty::Lift<'tcx> for StatementAsExpression {
-    type Lifted = StatementAsExpression;
-    fn lift_to_tcx(self, _tcx: TyCtxt<'tcx>) -> Option<StatementAsExpression> {
-        Some(self)
-    }
-}
-
 #[derive(Clone, Debug, PartialEq, Eq, HashStable, TyEncodable, TyDecodable)]
 #[derive(TypeVisitable, TypeFoldable)]
 pub struct MatchExpressionArmCause<'tcx> {
@@ -736,7 +729,7 @@ pub enum BuiltinImplSource {
     TupleUnsizing,
 }
 
-TrivialTypeTraversalAndLiftImpls! { BuiltinImplSource }
+TrivialTypeTraversalImpls! { BuiltinImplSource }
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash, HashStable, PartialOrd, Ord)]
 pub enum ObjectSafetyViolation {

compiler/rustc_middle/src/traits/select.rs

@@ -305,7 +305,7 @@ impl From<ErrorGuaranteed> for OverflowError {
     }
 }
 
-TrivialTypeTraversalAndLiftImpls! { OverflowError }
+TrivialTypeTraversalImpls! { OverflowError }
 
 impl<'tcx> From<OverflowError> for SelectionError<'tcx> {
     fn from(overflow_error: OverflowError) -> SelectionError<'tcx> {

compiler/rustc_middle/src/ty/abstract_const.rs

@@ -27,7 +27,7 @@ impl From<ErrorGuaranteed> for NotConstEvaluatable {
     }
 }
 
-TrivialTypeTraversalAndLiftImpls! { NotConstEvaluatable }
+TrivialTypeTraversalImpls! { NotConstEvaluatable }
 
 pub type BoundAbstractConst<'tcx> = Result<Option<EarlyBinder<ty::Const<'tcx>>>, ErrorGuaranteed>;
 

compiler/rustc_middle/src/ty/binding.rs

@@ -6,7 +6,7 @@ pub enum BindingMode {
     BindByValue(Mutability),
 }
 
-TrivialTypeTraversalAndLiftImpls! { BindingMode }
+TrivialTypeTraversalImpls! { BindingMode }
 
 impl BindingMode {
     pub fn convert(BindingAnnotation(by_ref, mutbl): BindingAnnotation) -> BindingMode {