REG_EBRACK
(void)MUSTEAT(']', REG_EBRACK);
(void)REQUIRE(MORE(), REG_EBRACK);
(void)REQUIRE(MORE(), REG_EBRACK);
(void)REQUIRE(MORE(), REG_EBRACK);
(void)REQUIRE(MORE(), REG_EBRACK);
(void)REQUIRE(MORE(), REG_EBRACK);
SETERROR(REG_EBRACK);
{REG_EBRACK, "REG_EBRACK", "brackets ([ ]) not balanced"},