code: def validate(inst):
      
      if _config._run_validators is False:
          return
  
      for a in fields(inst.__class__):
          v = a.validator
          if v is not None:
              v(inst, a, getattr(inst, a.name))
docs: Validate all attributes on *inst* that have a validator.
  
      Leaves all exceptions through.
  
      :param inst: Instance of a class with ``attrs`` attributes.