hif-token-concat

hif-token-concat is a compiled Lisp function in `hideif.el'.

(hif-token-concat A B)

Concatenate two tokens into a longer token.
Currently support only simple token concatenation. Also support weird (but
valid) token concatenation like '>' ## '>' becomes '>>'. Here we take care only
those that can be evaluated during preprocessing time and ignore all those that
can only be evaluated at C(++) runtime (like '++', '--' and '+='...).