diff --git a/src/test/auxiliary/issue2378a.rs b/src/test/auxiliary/issue2378a.rs
new file mode 100644
index 000000000000..35269a2d653c
--- /dev/null
+++ b/src/test/auxiliary/issue2378a.rs
@@ -0,0 +1,10 @@
+enum maybe<T> { just(T), nothing }
+
+impl methods<T:copy> for maybe<T> {
+    fn [](idx: uint) -> T {
+        alt self {
+          just(t) { t }
+          nothing { fail; }
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/test/auxiliary/issue2378b.rs b/src/test/auxiliary/issue2378b.rs
new file mode 100644
index 000000000000..9cfe4d3a3686
--- /dev/null
+++ b/src/test/auxiliary/issue2378b.rs
@@ -0,0 +1,12 @@
+use issue2378a;
+
+import issue2378a::maybe;
+import issue2378a::methods;
+
+type two_maybes<T> = {a: maybe<T>, b: maybe<T>};
+
+impl methods<T:copy> for two_maybes<T> {
+    fn [](idx: uint) -> (T, T) {
+        (self.a[idx], self.b[idx])
+    }
+}
\ No newline at end of file
diff --git a/src/test/run-pass/issue2378c.rs b/src/test/run-pass/issue2378c.rs
new file mode 100644
index 000000000000..c72be0e0d42e
--- /dev/null
+++ b/src/test/run-pass/issue2378c.rs
@@ -0,0 +1,14 @@
+// xfail-test -- #2378 unfixed 
+// aux-build:issue2378a.rs
+// aux-build:issue2378b.rs
+
+use issue2378a;
+use issue2378b;
+
+import issue2378a::{just, methods};
+import issue2378b::{methods};
+
+fn main() {
+    let x = {a: just(3), b: just(5)};
+    assert x[0u] == (3, 5);
+}