diff --git a/llvm/lib/Demangle/RustDemangle.cpp b/llvm/lib/Demangle/RustDemangle.cpp
--- a/llvm/lib/Demangle/RustDemangle.cpp
+++ b/llvm/lib/Demangle/RustDemangle.cpp
@@ -436,6 +436,11 @@
     demangleConst();
     print("]");
     break;
+  case 'S':
+    print("[");
+    demangleType();
+    print("]");
+    break;
   default:
     Position = Start;
     demanglePath(InType::Yes);
diff --git a/llvm/test/Demangle/rust.test b/llvm/test/Demangle/rust.test
--- a/llvm/test/Demangle/rust.test
+++ b/llvm/test/Demangle/rust.test
@@ -160,6 +160,9 @@
 CHECK: types::<[u8; 0]>
        _RIC5typesAhj0_E
 
+CHECK: types::<[_]>
+       _RIC5typesSpE
+
 ; Integer constants. Test value demangling.
 
 CHECK: integer::<0>