Fix IR lowering for generic interface types. (#4761)

* Fix IR lowering for generic interface types.

* Fix.

* Fix.

1 files changed, 31 insertions, 0 deletions

diff --git a/tests/language-feature/interfaces/generic-interface-conformance.slang b/tests/language-feature/interfaces/generic-interface-conformance.slang
new file mode 100644
index 000000000..9e0510125
--- /dev/null
+++ b/tests/language-feature/interfaces/generic-interface-conformance.slang
@@ -0,0 +1,31 @@
+// Test that we allow type conformances whose base interface is generic.
+
+//TEST(compute):COMPARE_COMPUTE_EX(filecheck-buffer=CHECK):-dx11 -compute  -output-using-type
+//TEST(compute):COMPARE_COMPUTE_EX(filecheck-buffer=CHECK):-vk -compute  -output-using-type
+
+public interface ITestInterface<Real : IFloat> {
+    Real sample();
+}
+
+struct TestInterfaceImpl<Real : IFloat> : ITestInterface<Real> {
+    Real sample() {
+        return x;
+    }
+    Real x;
+}
+
+//TEST_INPUT: set data = new StructuredBuffer<ITestInterface<float> >[new TestInterfaceImpl<float>{1.0}];
+StructuredBuffer<ITestInterface<float>> data;
+
+//TEST_INPUT: set outputBuffer = out ubuffer(data=[0 0 0 0], stride=4);
+RWStructuredBuffer<int> outputBuffer;
+
+//TEST_INPUT: type_conformance TestInterfaceImpl<float>:ITestInterface<float> = 3
+
+[numthreads(1, 1, 1)]
+void computeMain()
+{
+    let obj = data[0];
+    // CHECK: 1
+    outputBuffer[0] = int(obj.sample());
+}
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