Fix exact-match witness synthesis for static functions (#6204)

* fix non-static methods when trying to synthesize method requirement witness

* add tests

* update test

* improve test

---------

Co-authored-by: Yong He <yonghe@outlook.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/tests/language-feature/interfaces/static-method-not-implemented.slang b/tests/language-feature/interfaces/static-method-not-implemented.slang
new file mode 100644
index 000000000..1d46c1be6
--- /dev/null
+++ b/tests/language-feature/interfaces/static-method-not-implemented.slang
@@ -0,0 +1,27 @@
+//DIAGNOSTIC_TEST:SIMPLE(filecheck=CHECK): -target spirv
+
+interface Base
+{
+    static int getValue();
+}
+
+struct Impl : Base
+{
+    // This is not static and not allowed to implement the interface's static method.
+    // CHECK: error 38105: member 'getValue' does not match interface requirement
+    int getValue() { return 5; }
+}
+
+int callGet<Foo : Base>()
+{
+    return Foo::getValue();
+}
+
+RWStructuredBuffer<int> result;
+
+[numthreads(1, 1, 1)]
+void computeMain()
+{
+    result[0] = callGet<Impl>();
+}
+