diff --git a/test/Linker/Inputs/type-unique-dst-types2.ll b/test/Linker/Inputs/type-unique-dst-types2.ll
new file mode 100644
index 00000000000..b565c6d7364
--- /dev/null
+++ b/test/Linker/Inputs/type-unique-dst-types2.ll
@@ -0,0 +1,3 @@
+%A.11 = type { %B }
+%B = type { i8 }
+@g1 = external global %A.11
diff --git a/test/Linker/Inputs/type-unique-dst-types3.ll b/test/Linker/Inputs/type-unique-dst-types3.ll
new file mode 100644
index 00000000000..c5794ad839a
--- /dev/null
+++ b/test/Linker/Inputs/type-unique-dst-types3.ll
@@ -0,0 +1,2 @@
+%A.11 = type opaque
+@g2 = external global %A.11
diff --git a/test/Linker/type-unique-dst-types.ll b/test/Linker/type-unique-dst-types.ll
new file mode 100644
index 00000000000..6033cb4d501
--- /dev/null
+++ b/test/Linker/type-unique-dst-types.ll
@@ -0,0 +1,16 @@
+; RUN: llvm-link %p/type-unique-dst-types.ll \
+; RUN:           %p/Inputs/type-unique-dst-types2.ll \
+; RUN:           %p/Inputs/type-unique-dst-types3.ll -S -o - | FileCheck %s
+
+; This tests the importance of keeping track of which types are part of the
+; destination module.
+; When the second input is merged in, the context gets an unused A.11. When
+; the third module is then merged, we should pretend it doesn't exist.
+
+; CHECK: %A = type { %B }
+; CHECK-NEXT: %B = type { i8 }
+; CHECK-NEXT: %A.11.1 = type opaque
+
+%A = type { %B }
+%B = type { i8 }
+@g3 = external global %A