use enum for values returned by eat_continuation and eat_whitespace * lex.ll, lex.h (lexical_feedback::whitespace_type): New enum. (yum_yum): Delete typedef. (ATE_NOTHING, ATE_SPACE_OR_TAB, ATE_NEWLINE): Replace with NO_WHITESPACE, SPACE_OR_TAB, NEWLINE values from lexical_feedback::whitespace_type enum. When result of eat_continuation is used as a logical test for whitespace or no whitespace, compare to lexical_feedback::NO_WHITESPACE to produce bool value.