1 files changed, 10 insertions, 0 deletions

diff --git a/crates/ra_hir/src/either.rs b/crates/ra_hir/src/either.rs
index 6714529d9..4073cc82e 100644
--- a/crates/ra_hir/src/either.rs
+++ b/crates/ra_hir/src/either.rs
@@ -5,6 +5,16 @@ pub enum Either<A, B> {
 }
 
 impl<A, B> Either<A, B> {
+    pub fn either<R, F1, F2>(self, f1: F1, f2: F2) -> R
+    where
+        F1: FnOnce(A) -> R,
+        F2: FnOnce(B) -> R,
+    {
+        match self {
+            Either::A(a) => f1(a),
+            Either::B(b) => f2(b),
+        }
+    }
     pub fn map<U, V, F1, F2>(self, f1: F1, f2: F2) -> Either<U, V>
     where
         F1: FnOnce(A) -> U,