mysql-test/r/select.result:
  SELECT ... INTO user_variables
mysql-test/t/select.test:
  SELECT ... INTO user_variables
sql/sql_class.cc:
  SELECT ... INTO user_variables
sql/sql_class.h:
  SELECT ... INTO user_variables
sql/sql_lex.h:
  SELECT ... INTO user_variables
sql/sql_parse.cc:
  SELECT ... INTO user_variables
sql/sql_yacc.yy:
  SELECT ... INTO user_variables