diff --git a/test/ASTMerge/Inputs/enum1.c b/test/ASTMerge/Inputs/enum1.c
new file mode 100644
index 0000000..cbbed47
--- /dev/null
+++ b/test/ASTMerge/Inputs/enum1.c
@@ -0,0 +1,34 @@
+// Matching
+enum E1 {
+  E1Enumerator1,
+  E1Enumerator2 = 3,
+  E1Enumerator3
+} x1;
+
+// Value mismatch
+enum E2 {
+  E2Enumerator1,
+  E2Enumerator2 = 3,
+  E2Enumerator3
+} x2;
+
+// Name mismatch
+enum E3 {
+  E3Enumerator1,
+  E3Enumerator2 = 3,
+  E3Enumerator3
+} x3;
+
+// Missing enumerator
+enum E4 {
+  E4Enumerator1,
+  E4Enumerator2,
+  E4Enumerator3
+} x4;
+
+// Extra enumerator
+enum E5 {
+  E5Enumerator1,
+  E5Enumerator2,
+  E5Enumerator3
+} x5;
diff --git a/test/ASTMerge/Inputs/enum2.c b/test/ASTMerge/Inputs/enum2.c
new file mode 100644
index 0000000..050af82
--- /dev/null
+++ b/test/ASTMerge/Inputs/enum2.c
@@ -0,0 +1,35 @@
+// Matching
+enum E1 {
+  E1Enumerator1,
+  E1Enumerator2 = 3,
+  E1Enumerator3
+} x1;
+
+// Value mismatch
+enum E2 {
+  E2Enumerator1,
+  E2Enumerator2 = 4,
+  E2Enumerator3
+} x2;
+
+// Name mismatch
+enum E3 {
+  E3Enumerator1,
+  E3Enumerator = 3,
+  E3Enumerator3
+} x3;
+
+// Missing enumerator
+enum E4 {
+  E4Enumerator1,
+  E4Enumerator2
+} x4;
+
+// Extra enumerator
+enum E5 {
+  E5Enumerator1,
+  E5Enumerator2,
+  E5Enumerator3,
+  E5Enumerator4
+} x5;
+
diff --git a/test/ASTMerge/enum.c b/test/ASTMerge/enum.c
new file mode 100644
index 0000000..9b78fd1
--- /dev/null
+++ b/test/ASTMerge/enum.c
@@ -0,0 +1,25 @@
+// RUN: %clang_cc1 -emit-pch -o %t.1.ast %S/Inputs/enum1.c
+// RUN: %clang_cc1 -emit-pch -o %t.2.ast %S/Inputs/enum2.c
+// RUN: %clang_cc1 -ast-merge %t.1.ast -ast-merge %t.2.ast -fsyntax-only %s 2>&1 | FileCheck %s
+
+// CHECK: enum1.c:9:6: warning: type 'enum E2' has incompatible definitions in different translation units
+// CHECK: enum1.c:11:3: note: enumerator 'E2Enumerator2' with value 3 here
+// CHECK: enum2.c:11:3: note: enumerator 'E2Enumerator2' with value 4 here
+// CHECK: enum2.c:13:3: error: external variable 'x2' declared with incompatible types in different translation units ('enum E2' vs. 'enum E2')
+// CHECK: enum1.c:13:3: note: declared here with type 'enum E2'
+// CHECK: enum1.c:16:6: warning: type 'enum E3' has incompatible definitions in different translation units
+// CHECK: enum1.c:18:3: note: enumerator 'E3Enumerator2' with value 3 here
+// CHECK: enum2.c:18:3: note: enumerator 'E3Enumerator' with value 3 here
+// CHECK: enum2.c:20:3: error: external variable 'x3' declared with incompatible types in different translation units ('enum E3' vs. 'enum E3')
+// CHECK: enum1.c:20:3: note: declared here with type 'enum E3'
+// CHECK: enum1.c:23:6: warning: type 'enum E4' has incompatible definitions in different translation units
+// CHECK: enum1.c:26:3: note: enumerator 'E4Enumerator3' with value 2 here
+// CHECK: enum2.c:23:6: note: no corresponding enumerator here
+// CHECK: enum2.c:26:3: error: external variable 'x4' declared with incompatible types in different translation units ('enum E4' vs. 'enum E4')
+// CHECK: enum1.c:27:3: note: declared here with type 'enum E4'
+// CHECK: enum1.c:30:6: warning: type 'enum E5' has incompatible definitions in different translation units
+// CHECK: enum2.c:33:3: note: enumerator 'E5Enumerator4' with value 3 here
+// CHECK: enum1.c:30:6: note: no corresponding enumerator here
+// CHECK: enum2.c:34:3: error: external variable 'x5' declared with incompatible types in different translation units ('enum E5' vs. 'enum E5')
+// CHECK: enum1.c:34:3: note: declared here with type 'enum E5'
+// CHECK: 20 diagnostics generated