check lint level at session level

Author: dingxiangfei2009

compiler/rustc_hir_analysis/src/check/region.rs

@@ -14,6 +14,7 @@ use rustc_hir::def_id::DefId;
 use rustc_hir::intravisit::{self, Visitor};
 use rustc_hir::{Arm, Block, Expr, LetStmt, Pat, PatKind, Stmt};
 use rustc_index::Idx;
+use rustc_lint_defs::LintId;
 use rustc_middle::bug;
 use rustc_middle::middle::region::*;
 use rustc_middle::ty::TyCtxt;
@@ -172,10 +173,11 @@ fn resolve_block<'tcx>(visitor: &mut RegionResolutionVisitor<'tcx>, blk: &'tcx h
             let edition = blk.span.edition();
             if edition.at_least_rust_2024() {
                 visitor.terminating_scopes.insert(local_id);
-            } else if !matches!(
-                visitor.tcx.lint_level_at_node(lint::builtin::TAIL_EXPR_DROP_ORDER, blk.hir_id),
-                (lint::Level::Allow, _)
-            ) {
+            } else if !visitor
+                .tcx
+                .lints_that_dont_need_to_run(())
+                .contains(&LintId::of(lint::builtin::TAIL_EXPR_DROP_ORDER))
+            {
                 // If this temporary scope will be changing once the codebase adopts Rust 2024,
                 // and we are linting about possible semantic changes that would result,
                 // then record this node-id in the field `backwards_incompatible_scope`

compiler/rustc_mir_transform/src/lint_tail_expr_drop_order.rs

@@ -19,7 +19,7 @@ use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_mir_dataflow::impls::MaybeInitializedPlaces;
 use rustc_mir_dataflow::move_paths::{LookupResult, MoveData, MovePathIndex};
 use rustc_mir_dataflow::{Analysis, MaybeReachable, ResultsCursor};
-use rustc_session::lint;
+use rustc_session::lint::{self};
 use rustc_span::{DUMMY_SP, Span, Symbol};
 use rustc_type_ir::data_structures::IndexMap;
 use smallvec::{SmallVec, smallvec};
@@ -336,15 +336,7 @@ pub(crate) fn run_lint<'tcx>(tcx: TyCtxt<'tcx>, def_id: LocalDefId, body: &Body<
         // A synthetic coroutine has no HIR body and it is enough to just analyse the original body
         return;
     }
-    if body.span.edition().at_least_rust_2024()
-        || matches!(
-            tcx.lint_level_at_node(
-                lint::builtin::TAIL_EXPR_DROP_ORDER,
-                tcx.hir().body_owned_by(def_id).id().hir_id
-            ),
-            (lint::Level::Allow, _)
-        )
-    {
+    if body.span.edition().at_least_rust_2024() {
         return;
     }
     // ## About BIDs in blocks ##