1 files changed, 45 insertions, 0 deletions
diff --git a/tests/diagnostics/overload-ambiguous.slang b/tests/diagnostics/overload-ambiguous.slang
new file mode 100644
index 000000000..0c8f7bd21
--- /dev/null
+++ b/tests/diagnostics/overload-ambiguous.slang
@@ -0,0 +1,45 @@
+// https://github.com/shader-slang/slang/issues/4476
+
+//DIAGNOSTIC_TEST:SIMPLE(filecheck=CHECK):
+RWStructuredBuffer<uint> outputBuffer;
+
+namespace A1
+{
+    uint func()
+    {
+        return 1u;
+    }
+
+    namespace A2
+    {
+        uint func()
+        {
+            return 2u;
+        }
+    }
+}
+namespace B1
+{
+    uint func()
+    {
+        return 4u;
+    }
+}
+
+[numthreads(1, 1, 1)]
+[shader("compute")]
+void computeMain(uint3 threadID: SV_DispatchThreadID)
+{
+    using namespace A1;
+    using namespace A1::A2;
+    using namespace B1;
+    using namespace C1;
+
+    // Only A1::func() and B1::func() will cause ambiguity because the distance from
+    // the reference site to those two functions declaration are the same.
+    outputBuffer[0] = func();
+    // CHECK-NOT: {{.*}}A2::func() -> uint
+    // CHECK: ambiguous call to 'func' with arguments of type ()
+    // CHECK: candidate: func B1::func() -> uint
+    // CHECK: candidate: func A1::func() -> uint
+}