Initial support for immutable lambda expressions. (#6914)

* Initial support for immutable lambda expressions.

* More diagnostics, and langauge server fix.

* Language server fix.

* Fix bug identified in review.

* Add expected result.

* Update expected result.

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/language-feature/lambda/lambda-2.slang b/tests/language-feature/lambda/lambda-2.slang
new file mode 100644
index 000000000..b731f1855
--- /dev/null
+++ b/tests/language-feature/lambda/lambda-2.slang
@@ -0,0 +1,20 @@
+
+//TEST:COMPARE_COMPUTE(filecheck-buffer=CHECK):-vk -output-using-type
+//TEST:COMPARE_COMPUTE(filecheck-buffer=CHECK):-cpu -output-using-type
+
+//TEST_INPUT: set outputBuffer = out ubuffer(data=[0 0 0 0], stride=4)
+RWStructuredBuffer<float> outputBuffer;
+
+IFunc<float, float> createFunc(int c)
+{
+    return (float x) => (float)(x * 2 + c);
+}
+
+
+[numthreads(1, 1, 1)]
+void computeMain()
+{
+    let func = createFunc(2);
+    // CHECK: 8.0
+    outputBuffer[0] = func(3.0);
+}