lean2/src/library/sorry.cpp

35 lines
1.1 KiB
C++
Raw Normal View History

/*
Copyright (c) 2014 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#include "kernel/type_checker.h"
#include "kernel/environment.h"
#include "library/module.h"
namespace lean {
static name g_sorry_name("sorry");
static expr g_sorry(mk_constant(g_sorry_name));
static name g_l("l");
static expr g_sorry_type(mk_pi("A", mk_sort(mk_param_univ(g_l)), mk_var(0), binder_info(true)));
bool has_sorry(environment const & env) {
auto decl = env.find(g_sorry_name);
return decl && decl->get_type() == g_sorry_type;
}
environment declare_sorry(environment const & env) {
if (auto decl = env.find(g_sorry_name)) {
if (decl->get_type() != g_sorry_type)
throw exception("failed to declare 'sorry', environment already has an object named 'sorry'");
return env;
} else {
return module::add(env, check(env, mk_var_decl(g_sorry_name, list<name>(g_l), g_sorry_type)));
}
}
expr const & get_sorry_constant() { return g_sorry; }
name const & get_sorry_name() { return g_sorry_name; }
}