2 files changed, 43 insertions, 0 deletions
diff --git a/tests/diagnostics/comma-operator-warning-slang2026.slang b/tests/diagnostics/comma-operator-warning-slang2026.slang
new file mode 100644
index 000000000..e91f540d4
--- /dev/null
+++ b/tests/diagnostics/comma-operator-warning-slang2026.slang
@@ -0,0 +1,19 @@
+//DIAGNOSTIC_TEST:SIMPLE:
+
+#language 2026
+
+int testCommaOperatorInSlang2026()
+{
+    // In Slang 2026, this creates a tuple - should NOT generate a warning
+    let m = (1, 2, 3);
+    
+    // Test accessing tuple elements
+    let x = m._0;
+    let y = m._1;
+    let z = m._2;
+    
+    // Another tuple example - should NOT generate a warning
+    var t = (1.0f, 2.0f, 3.0f);
+    
+    return x + y + z;
+}
+\ No newline at end of file
diff --git a/tests/diagnostics/comma-operator-warning.slang b/tests/diagnostics/comma-operator-warning.slang
new file mode 100644
index 000000000..945cc792d
--- /dev/null
+++ b/tests/diagnostics/comma-operator-warning.slang
@@ -0,0 +1,24 @@
+//DIAGNOSTIC_TEST:SIMPLE(filecheck=CHECK):
+
+int testCommaOperator()
+{
+    // This should generate a warning - comma operator in variable initialization
+    // CHECK: ([[# @LINE+1]]): warning 41024:
+    float4 vColor = (0.f, 0.f, 0.f, 1.f);
+    
+    // This should NOT generate a warning - comma operator in for-loop side effect
+    for (int i = 0; i < 10; i++, vColor.x++)
+    {
+    }
+    
+    // This should generate a warning - comma operator in regular expression
+    // CHECK: ([[# @LINE+1]]): warning 41024:
+    int x = (1, 2, 3);
+    
+    // This should now generate a warning - comma operator in return statement
+    // CHECK: ([[# @LINE+2]]): warning 41024:
+    int a = 5;
+    return a *= 2, a + 1;
+}
+
+void someFunction(int value) {}
+\ No newline at end of file