code: def constant_action(self, text, loc, const):
          
          exshared.setpos(loc, text)
          if DEBUG > 0:
              print("CONST:",const)
              if DEBUG == 2: self.symtab.display()
              if DEBUG > 2: return
          return self.symtab.insert_constant(const[0], const[1])
docs: Code executed after recognising a constant