From cdfea42f1b28c6ec7b13500a64be823f67bf8e0a Mon Sep 17 00:00:00 2001
From: Ellie Hermaszewska <ellieh@nvidia.com>
Date: Fri, 7 Jul 2023 03:52:00 +0800
Subject: Fix erroneous error claiming variable is being used before its
 declaration (#2958)

* Simplify type of diagnoseImpl

* Show source line for Note diagnostics, opting out of this where appropriate

* Make declared after use diagnostic clearer

* Fix erroneous error claiming variable is being used before its declaration

Closes https://github.com/shader-slang/slang/issues/2936

* Fix build on msvc

---------

Co-authored-by: jsmall-nvidia <jsmall@nvidia.com>
---
 source/slang/slang-ast-decl.cpp | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'source/slang/slang-ast-decl.cpp')

diff --git a/source/slang/slang-ast-decl.cpp b/source/slang/slang-ast-decl.cpp
index 261378b9a..2f1c7c47e 100644
--- a/source/slang/slang-ast-decl.cpp
+++ b/source/slang/slang-ast-decl.cpp
@@ -102,4 +102,20 @@ void ContainerDecl::buildMemberDictionary()
     SLANG_ASSERT(isMemberDictionaryValid());
 }
 
+bool isLocalVar(const Decl* decl)
+{
+    const auto varDecl = as<VarDecl>(decl);
+    if(!varDecl)
+        return false;
+    const Decl* pp = varDecl->parentDecl;
+    if(as<ScopeDecl>(pp))
+        return true;
+    while(auto genericDecl = as<GenericDecl>(pp))
+        pp = genericDecl->inner;
+    if(as<FunctionDeclBase>(pp))
+        return true;
+
+    return false;
+}
+
 } // namespace Slang
-- 
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