Report error on nested functions. (#5792)

* Report error on nested functions.

* Fix.

---------

Co-authored-by: Ellie Hermaszewska <ellieh@nvidia.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/diagnostics/nested-func.slang b/tests/diagnostics/nested-func.slang
new file mode 100644
index 000000000..42634cb8a
--- /dev/null
+++ b/tests/diagnostics/nested-func.slang
@@ -0,0 +1,12 @@
+//DIAGNOSTIC_TEST:SIMPLE(filecheck=CHECK):
+
+
+struct VertexOutput{float Input;}
+float4 fragmentMain(VertexOutput vertex) : SV_Target
+{
+   // CHECK: ([[# @LINE+1]]): error 30102
+  static float GetValue(int val) { return vertex.Input; } // Simplified example
+  float a = GetValue(vertex.Input);
+
+  // etc
+}