1 files changed, 10 insertions, 0 deletions
diff --git a/tools/slang-test/main.cpp b/tools/slang-test/main.cpp
index 3d193dad4..7a0cac3ce 100644
--- a/tools/slang-test/main.cpp
+++ b/tools/slang-test/main.cpp
@@ -656,6 +656,16 @@ TestResult runSimpleTest(TestInput& input)
     {
         String actualOutputPath = outputStem + ".actual";
         Slang::File::WriteAllText(actualOutputPath, actualOutput);
+
+        if (options.outputMode == kOutputMode_AppVeyor)
+        {
+            fprintf(stderr, "ERROR:\n"
+                "EXPECTED{{{\n%s}}}\n"
+                "ACTUAL{{{\n%s}}}\n",
+                expectedOutput.Buffer(),
+                actualOutput.Buffer());
+            fflush(stderr);
+        }
     }
 
     return result;