rb_is_junk_id    15051 ext/ripper/ripper.c rb_is_junk_id(ID id)
rb_is_junk_id    9651 ext/ripper/ripper.y rb_is_junk_id(ID id)
rb_is_junk_id    14983 parse.c        rb_is_junk_id(ID id)
rb_is_junk_id    9651 parse.y        rb_is_junk_id(ID id)