The library (nausicaa parser-tools r6rs parser) implements a
lexer compliant with the R6RS specification for Scheme source code.
The lexer is built on top of the (nausicaa parser-tools lalr)
parser generator (see lalr) and it is meant to be used with the
lexer API exported by the (nausicaa parser-tools r6rs lexer)
library (see r6rs lexer).