bf(%ltype typename) 

    Specifies a user-defined token location type.  If bf(%ltype) is used,
tt(typename) should be the name of an alternate default-constructible type
(e.g., bf(size_t)). It should not be used together with a
link(%locationstruct)(LOCSTRUCT) specification. From inside the parser class,
this type may be referred to as bf(LTYPE_).

    Any text following tt(%ltype) up to the end of the line, up to the first
of a series of trailing blanks or tabs or up to a comment-token (tt(//) or
tt(/*)) becomes part of the type definition. Be sure em(not) to end an
tt(%ltype) definition in a semicolon.