Auto merge of rust-lang#132301 - compiler-errors:adjust, r=lcnr

Remove region from adjustments

It's not necessary to store this region, because it's only used in THIR and MemCat/ExprUse, both of which already basically only deal with erased regions anyways.

Author: bors

clippy_lints/src/dereference.rs

@@ -418,7 +418,7 @@ impl<'tcx> LateLintPass<'tcx> for Dereferencing<'tcx> {
                         let (required_refs, msg) = if can_auto_borrow {
                             (1, if deref_count == 1 { borrow_msg } else { deref_msg })
                         } else if let Some(&Adjustment {
-                            kind: Adjust::Borrow(AutoBorrow::Ref(_, mutability)),
+                            kind: Adjust::Borrow(AutoBorrow::Ref(mutability)),
                             ..
                         }) = next_adjust
                             && matches!(mutability, AutoBorrowMutability::Mut { .. })

clippy_lints/src/loops/explicit_into_iter_loop.rs

@@ -53,7 +53,7 @@ pub(super) fn check(cx: &LateContext<'_>, self_arg: &Expr<'_>, call_expr: &Expr<
         [] => AdjustKind::None,
         &[
             Adjustment {
-                kind: Adjust::Borrow(AutoBorrow::Ref(_, mutbl)),
+                kind: Adjust::Borrow(AutoBorrow::Ref(mutbl)),
                 ..
             },
         ] => AdjustKind::borrow(mutbl),
@@ -62,7 +62,7 @@ pub(super) fn check(cx: &LateContext<'_>, self_arg: &Expr<'_>, call_expr: &Expr<
                 kind: Adjust::Deref(_), ..
             },
             Adjustment {
-                kind: Adjust::Borrow(AutoBorrow::Ref(_, mutbl)),
+                kind: Adjust::Borrow(AutoBorrow::Ref(mutbl)),
                 target,
             },
         ] => {

clippy_lints/src/loops/explicit_iter_loop.rs

@@ -199,7 +199,7 @@ fn is_ref_iterable<'tcx>(
                     kind: Adjust::Deref(_), ..
                 },
                 Adjustment {
-                    kind: Adjust::Borrow(AutoBorrow::Ref(_, mutbl)),
+                    kind: Adjust::Borrow(AutoBorrow::Ref(mutbl)),
                     target,
                 },
                 ..,
@@ -236,7 +236,7 @@ fn is_ref_iterable<'tcx>(
             },
             &[
                 Adjustment {
-                    kind: Adjust::Borrow(AutoBorrow::Ref(_, mutbl)),
+                    kind: Adjust::Borrow(AutoBorrow::Ref(mutbl)),
                     target,
                 },
                 ..,

clippy_lints/src/methods/manual_inspect.rs

@@ -137,7 +137,7 @@ pub(crate) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, arg: &Expr<'_>, name:
                                 _ if matches!(
                                     typeck.expr_adjustments(prev_expr).first(),
                                     Some(Adjustment {
-                                        kind: Adjust::Borrow(AutoBorrow::Ref(_, AutoBorrowMutability::Not))
+                                        kind: Adjust::Borrow(AutoBorrow::Ref(AutoBorrowMutability::Not))
                                             | Adjust::Deref(_),
                                         ..
                                     })
@@ -230,7 +230,7 @@ fn check_use<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> (UseKind<'tcx>,
             if use_cx
                 .adjustments
                 .first()
-                .is_some_and(|a| matches!(a.kind, Adjust::Borrow(AutoBorrow::Ref(_, AutoBorrowMutability::Not)))) =>
+                .is_some_and(|a| matches!(a.kind, Adjust::Borrow(AutoBorrow::Ref(AutoBorrowMutability::Not)))) =>
         {
             UseKind::AutoBorrowed
         },

clippy_lints/src/redundant_slicing.rs

@@ -110,7 +110,7 @@ impl<'tcx> LateLintPass<'tcx> for RedundantSlicing {
                 ) || cx.typeck_results().expr_adjustments(expr).first().map_or(false, |a| {
                     matches!(
                         a.kind,
-                        Adjust::Borrow(AutoBorrow::Ref(_, AutoBorrowMutability::Mut { .. }))
+                        Adjust::Borrow(AutoBorrow::Ref(AutoBorrowMutability::Mut { .. }))
                     )
                 }) || (matches!(
                     cx.typeck_results().expr_ty(indexed).ref_mutability(),