diff --git a/src/test/run-pass/issue-2312.rs b/src/test/run-pass/issue-2312.rs
new file mode 100644
index 000000000000..267df6a37ade
--- /dev/null
+++ b/src/test/run-pass/issue-2312.rs
@@ -0,0 +1,11 @@
+// Testing that the B's are resolved
+
+trait clam<A> { }
+
+enum foo = int;
+
+impl foo {
+    fn bar<B,C:clam<B>>(c: C) -> B { fail; }
+}
+
+fn main() { }
\ No newline at end of file