2 files changed, 23 insertions, 0 deletions
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 {}