Auto merge of rust-lang#113573 - lcnr:typeck-results, r=compiler-errors

remove unnecessary `Rc`

the typeck results are already in a `RefCell`, so we don't need to wrap its fields in an `Rc`

Author: bors

compiler/rustc_hir_typeck/src/lib.rs

@@ -141,7 +141,7 @@ fn has_typeck_results(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
 }
 
 fn used_trait_imports(tcx: TyCtxt<'_>, def_id: LocalDefId) -> &UnordSet<LocalDefId> {
-    &*tcx.typeck(def_id).used_trait_imports
+    &tcx.typeck(def_id).used_trait_imports
 }
 
 fn typeck<'tcx>(tcx: TyCtxt<'tcx>, def_id: LocalDefId) -> &ty::TypeckResults<'tcx> {

compiler/rustc_hir_typeck/src/method/mod.rs

@@ -12,7 +12,6 @@ pub use self::MethodError::*;
 
 use crate::errors::OpMethodGenericParams;
 use crate::FnCtxt;
-use rustc_data_structures::sync::Lrc;
 use rustc_errors::{Applicability, Diagnostic, SubdiagnosticMessage};
 use rustc_hir as hir;
 use rustc_hir::def::{CtorOf, DefKind, Namespace};
@@ -190,11 +189,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         self.lint_dot_call_from_2018(self_ty, segment, span, call_expr, self_expr, &pick, args);
 
-        for import_id in &pick.import_ids {
+        for &import_id in &pick.import_ids {
             debug!("used_trait_import: {:?}", import_id);
-            Lrc::get_mut(&mut self.typeck_results.borrow_mut().used_trait_imports)
-                .unwrap()
-                .insert(*import_id);
+            self.typeck_results.borrow_mut().used_trait_imports.insert(import_id);
         }
 
         self.tcx.check_stability(pick.item.def_id, Some(call_expr.hir_id), span, None);
@@ -567,10 +564,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         debug!(?pick);
         {
             let mut typeck_results = self.typeck_results.borrow_mut();
-            let used_trait_imports = Lrc::get_mut(&mut typeck_results.used_trait_imports).unwrap();
             for import_id in pick.import_ids {
                 debug!(used_trait_import=?import_id);
-                used_trait_imports.insert(import_id);
+                typeck_results.used_trait_imports.insert(import_id);
             }
         }
 

compiler/rustc_middle/src/ty/typeck_results.rs

@@ -7,11 +7,8 @@ use crate::{
         GenericArgKind, InternalSubsts, SubstsRef, Ty, UserSubsts,
     },
 };
-use rustc_data_structures::{
-    fx::{FxHashMap, FxIndexMap},
-    sync::Lrc,
-    unord::{UnordItems, UnordSet},
-};
+use rustc_data_structures::fx::{FxHashMap, FxIndexMap};
+use rustc_data_structures::unord::{UnordItems, UnordSet};
 use rustc_errors::ErrorGuaranteed;
 use rustc_hir as hir;
 use rustc_hir::{
@@ -145,7 +142,7 @@ pub struct TypeckResults<'tcx> {
     /// This is used for warning unused imports. During type
     /// checking, this `Lrc` should not be cloned: it must have a ref-count
     /// of 1 so that we can insert things into the set mutably.
-    pub used_trait_imports: Lrc<UnordSet<LocalDefId>>,
+    pub used_trait_imports: UnordSet<LocalDefId>,
 
     /// If any errors occurred while type-checking this body,
     /// this field will be set to `Some(ErrorGuaranteed)`.
@@ -273,7 +270,7 @@ impl<'tcx> TypeckResults<'tcx> {
             liberated_fn_sigs: Default::default(),
             fru_field_types: Default::default(),
             coercion_casts: Default::default(),
-            used_trait_imports: Lrc::new(Default::default()),
+            used_trait_imports: Default::default(),
             tainted_by_errors: None,
             concrete_opaque_types: Default::default(),
             closure_min_captures: Default::default(),