(hide-ifdef-env, hif-outside-read-only):

(hide-ifdef-env, hif-outside-read-only):
Move declaration before first use.
(hif-parse-if-exp, hif-nexttoken, hif-expr, hif-term, hif-eq-expr,
hif-math, hif-factor): Rename token to hif-token and token-list to
hif-token-list.
(hif-token, hif-token-list): Declare them.
(hif-find-ifdef-block): Return cons of top and bottom point
instead of setting dynamically bound variables.
(hide-ifdef-block, show-ifdef-block): Use return value of
hif-find-ifdef-block.