/*
Copyright (c) 2013 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.

Author: Leonardo de Moura
*/
#include "kernel/occurs.h"
#include "library/placeholder.h"

namespace lean {
static name g_placeholder_name("_");
expr mk_placholder() {
    return mk_constant(g_placeholder_name);
}

bool is_placeholder(expr const & e) {
    return is_constant(e) && const_name(e) == g_placeholder_name;
}

bool has_placeholder(expr const & e) {
    return occurs(mk_placholder(), e);
}
}