From 5a510ab28381ae93d1011f0bb6c9db4cbf589578 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Fri, 28 Oct 2022 10:41:42 -0700
Subject: Fix  language server crash on incomplete higher order invoke expr.
 (#2476)

Co-authored-by: Yong He <yhe@nvidia.com>
---
 tests/language-server/high-order-expr.slang         | 21 +++++++++++++++++++++
 .../high-order-expr.slang.expected.txt              |  3 +++
 2 files changed, 24 insertions(+)
 create mode 100644 tests/language-server/high-order-expr.slang
 create mode 100644 tests/language-server/high-order-expr.slang.expected.txt

(limited to 'tests')

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
+}
diff --git a/tests/language-server/high-order-expr.slang.expected.txt b/tests/language-server/high-order-expr.slang.expected.txt
new file mode 100644
index 000000000..dd2c29b31
--- /dev/null
+++ b/tests/language-server/high-order-expr.slang.expected.txt
@@ -0,0 +1,3 @@
+--------
+null
+
-- 
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