From 4ae6e9d8b7790d827ca9edd729ad94f38a0c73de Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Thu, 12 Jun 2025 07:57:42 -0700
Subject: Diagnose on use of struct inheritance. (#7419)

* Diagnose on use of struct inheritance.

* fix test.

* Fix tests.

* fix.

---------

Co-authored-by: ArielG-NV <159081215+ArielG-NV@users.noreply.github.com>
---
 tests/diagnostics/inheritance-1.slang | 13 +++++++++++++
 tests/diagnostics/inheritance-2.slang | 10 ++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 tests/diagnostics/inheritance-1.slang
 create mode 100644 tests/diagnostics/inheritance-2.slang

(limited to 'tests/diagnostics')

diff --git a/tests/diagnostics/inheritance-1.slang b/tests/diagnostics/inheritance-1.slang
new file mode 100644
index 000000000..c811623d8
--- /dev/null
+++ b/tests/diagnostics/inheritance-1.slang
@@ -0,0 +1,13 @@
+//DIAGNOSTIC_TEST:SIMPLE(filecheck=CHECK):
+
+// Tests that we will diagnose a warning on struct inheritance being unstable
+// before Slang 2026.
+
+#lang 2025
+
+struct Base {}
+
+//CHECK: ([[# @LINE+1]]): warning 30816:
+struct Derived : Base {}
+
+struct Base1 {}
\ No newline at end of file
diff --git a/tests/diagnostics/inheritance-2.slang b/tests/diagnostics/inheritance-2.slang
new file mode 100644
index 000000000..6b1bcfaff
--- /dev/null
+++ b/tests/diagnostics/inheritance-2.slang
@@ -0,0 +1,10 @@
+//DIAGNOSTIC_TEST:SIMPLE(filecheck=CHECK):
+
+// Tests that we will diagnose an error on struct inheritance in language 2026 or later.
+
+#lang 2026
+
+struct Base {}
+
+//CHECK: ([[# @LINE+1]]): error 30811:
+struct Derived : Base {}
-- 
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