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))
  
          allowed_block_types = (GremlinFoldedFilter, GremlinFoldedTraverse, Backtrack)
          for block in self.folded_ir_blocks:
              if not isinstance(block, allowed_block_types):
                  raise AssertionError(
                      u'Found invalid block of type {} in folded_ir_blocks: {} '
                      u'Allowed types are {}.'
                      .format(type(block), self.folded_ir_blocks, allowed_block_types))
  
          if not isinstance(self.field_type, GraphQLList):
              raise ValueError(u'Invalid value of "field_type", expected a list type but got: '
                               u'{}'.format(self.field_type))
  
          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 '
                  u'not supported: {} {}'.format(self.fold_scope_location, self.field_type.of_type))
docs: Validate that the GremlinFoldedContextField is correctly representable.