From a4345725a083651c16795d27fedd769f2d7e55ae Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Mon, 16 Jun 2025 20:37:27 -0700
Subject: Require `override` keyword for overriding default interface methods.
 (#7458)

* Require `override` keyword for overriding default interface methods.

* Update doc.

* Fix test.
---
 tests/diagnostics/missing-override.slang | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 tests/diagnostics/missing-override.slang

(limited to 'tests/diagnostics')

diff --git a/tests/diagnostics/missing-override.slang b/tests/diagnostics/missing-override.slang
new file mode 100644
index 000000000..cc2cbcad3
--- /dev/null
+++ b/tests/diagnostics/missing-override.slang
@@ -0,0 +1,20 @@
+//DIAGNOSTIC_TEST:SIMPLE(filecheck=CHECK):
+
+interface IFoo
+{
+    int getVal() { return 0; }
+}
+
+struct Impl : IFoo
+{
+    // Missing override for getVal, which should trigger a diagnostic.
+    // CHECK: ([[# @LINE+1]]): error 30853
+    int getVal() { return 1; }
+}
+
+struct Impl2 : IFoo
+{
+    // Overriding getVal with a different signature should also trigger a diagnostic.
+    // CHECK: ([[# @LINE+1]]): error 30854
+    override int getVal(int x) { return x; }
+}
\ No newline at end of file
-- 
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