1 files changed, 21 insertions, 0 deletions
diff --git a/tests/language-server/high-order-expr.slang b/tests/language-server/high-order-expr.slang
new file mode 100644
index 000000000..f7f502e8f
--- /dev/null
+++ b/tests/language-server/high-order-expr.slang
@@ -0,0 +1,21 @@
+//TEST:LANG_SERVER:
+RWStructuredBuffer<float> outputBuffer;
+
+[ForwardDifferentiable]
+float f(float x)
+{
+    return x * x;
+}
+
+[ForwardDifferentiable]
+float df(float x)
+{
+//HOVER:14,17
+    return __fwd_diff();
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    outputBuffer[0] = __fwd_diff(df)(__DifferentialPair<float>(x, 1.0)).d(); // Expect: 2.0
+}