code: func yaml_parser_fetch_flow_scalar(parser *yaml_parser_t, single bool) bool {
  	// A plain scalar could be a simple key.
  	if !yaml_parser_save_simple_key(parser) {
  		return false
  	}
  
  	// A simple key cannot follow a flow scalar.
  	parser.simple_key_allowed = false
  
  	// Create the SCALAR token and append it to the queue.
  	var token yaml_token_t
  	if !yaml_parser_scan_flow_scalar(parser, &token, single) {
  		return false
  	}
  	yaml_insert_token(parser, -1, &token)
  	return true
  }
docs: // Produce the SCALAR(...,single-quoted) or SCALAR(...,double-quoted) tokens.