Function plg_rt_existence_error 

#[unsafe(no_mangle)]
pub extern "C" fn plg_rt_existence_error(
    m: *mut Machine,
    functor: u32,
    arity: u32,
    site_id: u32,
) -> i32

Raise existence_error(procedure, F/A) — the compiled stub for body goals that reference a predicate with no clauses (and the runtime path for unknown query goals shares the message shape).