diff --git a/tests/source/impls.rs b/tests/source/impls.rs
index ca8e486646a1..85e0ef0d42b0 100644
--- a/tests/source/impls.rs
+++ b/tests/source/impls.rs
@@ -152,3 +152,8 @@ impl Foo {
         1
     }
 }
+
+// #2491
+impl<'a, 'b, 'c> SomeThing<Something> for (&'a mut SomethingLong, &'b mut SomethingLong, &'c mut SomethingLong) {
+    fn foo() {}
+}
diff --git a/tests/target/impls.rs b/tests/target/impls.rs
index 91172b39fe59..0bc28acf7eaa 100644
--- a/tests/target/impls.rs
+++ b/tests/target/impls.rs
@@ -217,3 +217,14 @@ impl Foo {
         1
     }
 }
+
+// #2491
+impl<'a, 'b, 'c> SomeThing<Something>
+    for (
+        &'a mut SomethingLong,
+        &'b mut SomethingLong,
+        &'c mut SomethingLong,
+    )
+{
+    fn foo() {}
+}