- bi-drop-lit STRINGprocedure
Matches STRING case-insensitively, contributing nothing to the parsed value list; on print, emits STRING's canonical spelling without consuming a value. The usual way to write a fixed keyword inside define-bi-rule.
bi-set, bi-range, and bi-set-from-string are the bidirectional counterparts of set, range, and set-from-string: each matches, and on print validates, a character against a character set, a range, or a set of characters given as a string.