In file included from main.cpp:121:0:
format_visitor.h:79:5: error: 'flag' does not name a type; did you mean 'float'?
     flag = 0;
     ^~~~
     float
format_visitor.h: In member function 'virtual void FormatVisitor::Visit(const VarDeclarationNode*)':
format_visitor.h:47:9: error: 'flag' was not declared in this scope
         flag++;
         ^~~~
format_visitor.h:47:9: note: suggested alternative: 'float'
         flag++;
         ^~~~
         float
format_visitor.h: In member function 'virtual void FormatVisitor::Visit(const MethodDeclarationNode*)':
format_visitor.h:63:11: error: expected ';' before '}' token
           }
           ^