Shader: Fix unit tests

include/Nazara/Shader/Ast/Attribute.hpp

@@ -39,6 +39,8 @@ namespace Nz::ShaderAst
 
 			bool HasValue() const;
 
+			void Reset();
+
 			ExpressionValue& operator=(const ExpressionValue&) = default;
 			ExpressionValue& operator=(ExpressionValue&&) noexcept = default;
 

include/Nazara/Shader/Ast/Attribute.inl

@@ -67,6 +67,12 @@ namespace Nz::ShaderAst
 	{
 		return !std::holds_alternative<std::monostate>(m_value);
 	}
+
+	template<typename T>
+	void ExpressionValue<T>::Reset()
+	{
+		m_value = {};
+	}
 }
 
 #include <Nazara/Shader/DebugOff.hpp>

src/Nazara/Shader/Ast/SanitizeVisitor.cpp

@@ -887,9 +887,11 @@ namespace Nz::ShaderAst
 		}
 
 		if (node.returnType.HasValue())
+		{
 			clone->returnType = ResolveType(node.returnType);
-		else
+			if (clone->returnType.HasValue() && IsNoType(clone->returnType.GetResultingValue()))
-			clone->returnType = ExpressionType{ NoType{} };
+				clone->returnType.Reset(); //< handle void as no return type
+		}
 
 		if (node.depthWrite.HasValue())
 			clone->depthWrite = ComputeExprValue(node.depthWrite);