SYM_HOOK
add_hook(&match_symbol, SYM_HOOK);
add_hook(&match_symbol, SYM_HOOK);
add_hook(&match_symbol, SYM_HOOK);
add_hook(&match_symbol, SYM_HOOK);
add_hook(&match_done, SYM_HOOK);
add_hook(&match_symbol, SYM_HOOK);
add_hook(&match_symbol, SYM_HOOK);
__pass_to_client(expr, SYM_HOOK);
[SYM_HOOK] = EXPR_PTR,