Add diagnostic on invalid type constraint. (#3769)

1 files changed, 27 insertions, 0 deletions

diff --git a/tests/diagnostics/invalid-constraint.slang b/tests/diagnostics/invalid-constraint.slang
new file mode 100644
index 000000000..667077ffb
--- /dev/null
+++ b/tests/diagnostics/invalid-constraint.slang
@@ -0,0 +1,27 @@
+//DIAGNOSTIC_TEST:SIMPLE(filecheck=CHECK):
+
+interface IFoo
+{
+    This foo();
+}
+
+struct Foo : IFoo
+{
+    float x;
+    This foo()
+    {
+        This f;
+        f.x = 0.0;
+        return f;
+    }
+}
+
+RWStructuredBuffer<float> output;
+
+// CHECK: ([[# @LINE+1]]): error 30401
+float compute<T:Foo>(T f) // error, should be IFoo here.
+{
+}
+
+void main()
+{}