semantic-lex-debug
semantic-lex-debug is an interactive compiled Lisp function in `lex.el
'.
(semantic-lex-debug ARG)
Debug the semantic lexer in the current buffer.
Argument ARG specifies of the analyze the whole buffer, or start at point.
While engaged, each token identified by the lexer will be highlighted
in the target buffer A description of the current token will be
displayed in the minibuffer. Press SPC to move to the next lexical token.