Fix parallel compiler.

Author: cjgillot

compiler/rustc_middle/src/hir/mod.rs

@@ -10,6 +10,7 @@ use crate::ty::query::Providers;
 use crate::ty::{DefIdTree, ImplSubject, TyCtxt};
 use rustc_data_structures::fingerprint::Fingerprint;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
+use rustc_data_structures::sync::{par_for_each_in, Send, Sync};
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_hir::*;
 use rustc_query_system::ich::StableHashingContext;
@@ -61,6 +62,22 @@ impl ModuleItems {
     pub fn foreign_items(&self) -> impl Iterator<Item = ForeignItemId> + '_ {
         self.foreign_items.iter().copied()
     }
+
+    pub fn par_items(&self, f: impl Fn(ItemId) + Send + Sync) {
+        par_for_each_in(&self.items[..], |&id| f(id))
+    }
+
+    pub fn par_trait_items(&self, f: impl Fn(TraitItemId) + Send + Sync) {
+        par_for_each_in(&self.trait_items[..], |&id| f(id))
+    }
+
+    pub fn par_impl_items(&self, f: impl Fn(ImplItemId) + Send + Sync) {
+        par_for_each_in(&self.impl_items[..], |&id| f(id))
+    }
+
+    pub fn par_foreign_items(&self, f: impl Fn(ForeignItemId) + Send + Sync) {
+        par_for_each_in(&self.foreign_items[..], |&id| f(id))
+    }
 }
 
 impl<'tcx> TyCtxt<'tcx> {

compiler/rustc_typeck/src/check/wfcheck.rs

@@ -4,7 +4,6 @@ use crate::constrained_generic_params::{identify_constrained_generic_params, Par
 
 use rustc_ast as ast;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
-use rustc_data_structures::sync::par_for_each_in;
 use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder, ErrorGuaranteed};
 use rustc_hir as hir;
 use rustc_hir::def_id::{DefId, LocalDefId};
@@ -1861,10 +1860,10 @@ fn check_false_global_bounds(fcx: &FnCtxt<'_, '_>, mut span: Span, id: hir::HirI
 
 fn check_mod_type_wf(tcx: TyCtxt<'_>, module: LocalDefId) {
     let items = tcx.hir_module_items(module);
-    par_for_each_in(items.items(), |item| tcx.ensure().check_well_formed(item.def_id));
-    par_for_each_in(items.impl_items(), |item| tcx.ensure().check_well_formed(item.def_id));
-    par_for_each_in(items.trait_items(), |item| tcx.ensure().check_well_formed(item.def_id));
-    par_for_each_in(items.foreign_items(), |item| tcx.ensure().check_well_formed(item.def_id));
+    items.par_items(|item| tcx.ensure().check_well_formed(item.def_id));
+    items.par_impl_items(|item| tcx.ensure().check_well_formed(item.def_id));
+    items.par_trait_items(|item| tcx.ensure().check_well_formed(item.def_id));
+    items.par_foreign_items(|item| tcx.ensure().check_well_formed(item.def_id));
 }
 
 ///////////////////////////////////////////////////////////////////////////