Fix requirement candidate lookup to prefer decls in the same paraent as the inheritance decl. (#5965)

1 files changed, 43 insertions, 0 deletions

diff --git a/tests/language-feature/interfaces/overloaded-associatedtype.slang b/tests/language-feature/interfaces/overloaded-associatedtype.slang
new file mode 100644
index 000000000..4630c76a6
--- /dev/null
+++ b/tests/language-feature/interfaces/overloaded-associatedtype.slang
@@ -0,0 +1,43 @@
+//TEST:COMPARE_COMPUTE(filecheck-buffer=CHECK): -output-using-type
+
+interface IFoo<T> {
+    associatedtype Output : IBar;
+    func foo(other: T) -> Output;
+}
+
+interface IBar { int getId(); }
+
+struct Ant:IBar { int getId() { return 0; } };
+struct Bat:IBar { int getId() { return 1; } };
+struct Cat:IBar { int getId() { return 2; } };
+struct Dog:IBar { int getId() { return 3; } };
+struct Ewe:IBar { int getId() { return 4; } };
+struct Fox:IBar { int getId() { return 5; } };
+struct Gnu:IBar { int getId() { return 6; } };
+
+extension Ant: IFoo<Bat> {
+    typedef Cat Output;
+    func foo(other: Bat) -> Cat { return Cat(); }
+}
+extension Ant: IFoo<Dog> {
+    typedef Ewe Output;
+    func foo(other: Dog) -> Ewe { return Ewe(); }
+}
+extension Ant: IFoo<Fox> {
+    typedef Gnu Output;
+    func foo(other: Fox) -> Gnu { return Gnu(); }
+}
+
+int test<T:IFoo<Fox>>(T v) {
+    return v.foo(Fox()).getId();
+}
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=output
+RWStructuredBuffer<int> output;
+
+[numthreads(1,1,1)]
+void computeMain() {
+    Ant a;
+    // CHECK: 6
+    output[0] = test(a);
+}
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