rust-lang
diff --git a/‎compiler/rustc_data_structures/src/sync.rs
+1-1 b/‎compiler/rustc_data_structures/src/sync.rs
+1-1
diff --git a/‎compiler/rustc_data_structures/src/sync/parallel.rs
+25 b/‎compiler/rustc_data_structures/src/sync/parallel.rs
+25
@@ -54,7 +54,7 @@ pub use worker_local::{Registry, WorkerLocal};
 mod parallel;
 #[cfg(parallel_compiler)]
 pub use parallel::scope;
-pub use parallel::{join, par_for_each_in, par_map, parallel_guard};
+pub use parallel::{join, par_for_each_in, par_map, parallel_guard, try_par_for_each_in};
 
 pub use std::sync::atomic::Ordering;
 pub use std::sync::atomic::Ordering::SeqCst;
 
@@ -77,6 +77,15 @@ mod disabled {
         })
     }
 
+    pub fn try_par_for_each_in<T: IntoIterator, E: Copy>(
+        t: T,
+        mut for_each: impl FnMut(T::Item) -> Result<(), E>,
+    ) -> Result<(), E> {
+        parallel_guard(|guard| {
+            t.into_iter().fold(Ok(()), |ret, i| guard.run(|| for_each(i)).unwrap_or(ret).and(ret))
+        })
+    }
+
     pub fn par_map<T: IntoIterator, R, C: FromIterator<R>>(
         t: T,
         mut map: impl FnMut(<<T as IntoIterator>::IntoIter as Iterator>::Item) -> R,
@@ -167,6 +176,22 @@ mod enabled {
         });
     }
 
+    pub fn try_par_for_each_in<I, T: IntoIterator<Item = I> + IntoParallelIterator<Item = I>, E>(
+        t: T,
+        for_each: impl Fn(I) -> Result<(), E> + DynSync + DynSend,
+    ) -> Result<(), E> {
+        parallel_guard(|guard| {
+            if mode::is_dyn_thread_safe() {
+                let for_each = FromDyn::from(for_each);
+                t.into_par_iter()
+                    .fold(Ok(()), |ret, i| guard.run(|| for_each(i)).unwrap_or(ret).and(ret))
+            } else {
+                t.into_iter()
+                    .fold(Ok(()), |ret, i| guard.run(|| for_each(i)).unwrap_or(ret).and(ret))
+            }
+        });
+    }
+
     pub fn par_map<
         I,
         T: IntoIterator<Item = I> + IntoParallelIterator<Item = I>,