Function pcall_k 

pub fn pcall_k(
    state: &mut LuaState,
    nargs: i32,
    nresults: i32,
    errfunc: i32,
    ctx: isize,
    k: Option<fn(&mut LuaState, i32, isize) -> Result<usize, LuaError>>,
) -> Result<LuaStatus, LuaError>