diff --git a/src/llvm b/src/llvm
index ab85d02e84ede..d66318a4aae08 160000
--- a/src/llvm
+++ b/src/llvm
@@ -1 +1 @@
-Subproject commit ab85d02e84edeea59ac38505a62ec7d0536cc726
+Subproject commit d66318a4aae089bae5c3c38ee42daaa1bd8fadb7
diff --git a/src/rustllvm/llvm-auto-clean-trigger b/src/rustllvm/llvm-auto-clean-trigger
index 348fb01b605ef..fd5c87db22cdb 100644
--- a/src/rustllvm/llvm-auto-clean-trigger
+++ b/src/rustllvm/llvm-auto-clean-trigger
@@ -1,4 +1,4 @@
 # If this file is modified, then llvm will be forcibly cleaned and then rebuilt.
 # The actual contents of this file do not matter, but to trigger a change on the
 # build bots then the contents should be changed so git updates the mtime.
-2014-07-20
+2014-07-21
diff --git a/src/test/run-pass/issue-15793.rs b/src/test/run-pass/issue-15793.rs
new file mode 100644
index 0000000000000..a28cb87cfe245
--- /dev/null
+++ b/src/test/run-pass/issue-15793.rs
@@ -0,0 +1,34 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+enum NestedEnum {
+    First,
+    Second,
+    Third
+}
+enum Enum {
+    Variant1(bool),
+    Variant2(NestedEnum)
+}
+
+#[inline(never)]
+fn foo(x: Enum) -> int {
+    match x {
+        Variant1(true) => 1,
+        Variant1(false) => 2,
+        Variant2(Second) => 3,
+        Variant2(Third) => 4,
+        Variant2(First) => 5
+    }
+}
+
+fn main() {
+    assert_eq!(foo(Variant2(Third)), 4);
+}