Merge branch 'issue/local-function-id' into 'develop'

Fix a vicious bug in symbol table management

See merge request !77

src/language/utils/SymbolTable.hpp

@@ -267,6 +267,8 @@ class SymbolTable
   clearValues()
   {
     for (auto& symbol : m_symbol_list) {
+      // local functions must kept their values (id)
+      if (symbol.attributes().dataType() != ASTNodeDataType::function_t) {
         std::visit(
           [](auto&& value) {
             using T = std::decay_t<decltype(value)>;
@@ -275,6 +277,7 @@ class SymbolTable
           symbol.attributes().value());
       }
     }
+  }
 
   auto
   find(const std::string& symbol, const TAO_PEGTL_NAMESPACE::position& use_position)