2 files changed, 22 insertions, 2 deletions
diff --git a/tests/diagnostics/interfaces/return-type-mismatch.slang b/tests/diagnostics/interfaces/return-type-mismatch.slang
new file mode 100644
index 000000000..244f2f18e
--- /dev/null
+++ b/tests/diagnostics/interfaces/return-type-mismatch.slang
@@ -0,0 +1,20 @@
+// return-type-mismatch.slang
+
+//DIAGNOSTIC_TEST:SIMPLE(filecheck=CHECK):
+
+enum LobeTypes : uint32_t { None = 0, Diffuse = 1 }
+
+interface IMaterialInstance {
+    LobeTypes get_lobe_types();
+}
+
+struct Broken : IMaterialInstance {
+    // CHECK: ([[# @LINE+1]]): error 38106:
+    uint get_lobe_types() { return LobeTypes::Diffuse; }
+}
+
+int test()
+{
+    Broken b;
+    return 0;
+}
+\ No newline at end of file
diff --git a/tests/language-feature/interfaces/argument-direction-mismatch.slang b/tests/language-feature/interfaces/argument-direction-mismatch.slang
index cf9d99fdd..e02715ea0 100644
--- a/tests/language-feature/interfaces/argument-direction-mismatch.slang
+++ b/tests/language-feature/interfaces/argument-direction-mismatch.slang
@@ -6,11 +6,11 @@ public interface ITest {
 };
 
 public struct TestImpl : ITest {
-    // CHECK: ([[# @LINE + 1]]): error 38105
+    // CHECK: ([[# @LINE + 1]]): error 38108
     public void testIn(out int a) {
         a = 5;
     }
-    // CHECK: ([[# @LINE + 1]]): error 38105
+    // CHECK: ([[# @LINE + 1]]): error 38108
     public void testOut(int b) {
         b = 6;
     }