code: def validate(self):
          
          if not isinstance(self.fold_scope_location, FoldScopeLocation):
              raise TypeError(u'Expected FoldScopeLocation fold_scope_location, got: {} {}'.format(
                  type(self.fold_scope_location), self.fold_scope_location))
  
          if self.fold_scope_location.field is None:
              raise ValueError(u'Expected FoldScopeLocation at a field, but got: {}'
                               .format(self.fold_scope_location))
  
          if self.fold_scope_location.field == COUNT_META_FIELD_NAME:
              if not GraphQLInt.is_same_type(self.field_type):
                  raise TypeError(u'Expected the _x_count meta-field to be of GraphQLInt type, but '
                                  u'encountered type {} instead: {}'
                                  .format(self.field_type, self.fold_scope_location))
          else:
              if not isinstance(self.field_type, GraphQLList):
                  raise ValueError(u'Invalid value of "field_type" for a field that is not '
                                   u'a meta-field, expected a list type but got: {} {}'
                                   .format(self.field_type, self.fold_scope_location))
  
              inner_type = strip_non_null_from_type(self.field_type.of_type)
              if isinstance(inner_type, GraphQLList):
                  raise GraphQLCompilationError(
                      u'Outputting list-valued fields in a @fold context is currently not supported: '
                      u'{} {}'.format(self.fold_scope_location, self.field_type.of_type))
docs: Validate that the FoldedContextField is correctly representable.