Function disableshfuncnode 

pub fn disableshfuncnode(hn: &str)

Port of disableshfuncnode(HashNode hn, UNUSED(int flags)) from Src/hashtable.c:855.

C body:

hn->flags |= DISABLED;
if (!strncmp(hn->nam, "TRAP", 4)) {
    int sigidx = getsigidx(hn->nam + 4);
    if (sigidx != -1) {
        sigtrapped[sigidx] &= ~ZSIG_FUNC;
        unsettrap(sigidx);
    }
}

Sets the DISABLED flag on the function entry; for TRAP* functions, also unsettraps the corresponding signal so the shell stops invoking the (now-disabled) trap. WARNING: param names don’t match C — Rust=(hn) vs C=(hn, flags)