31 lines
1,003 B
C++
31 lines
1,003 B
C++
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/*
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Copyright (c) 2014 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#include "library/aliases.h"
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#include "library/tactic/util.h"
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namespace lean {
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bool is_tactic_namespace_open(environment const & env) {
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name apply_tac({"tactic", "apply"});
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for (name const & a : get_expr_aliases(env, "apply")) {
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if (a == apply_tac) {
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// make sure the type is the expected one
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if (auto d = env.find(a)) {
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expr t = d->get_type();
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if (is_pi(t)) {
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expr b = binding_body(t);
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if (!is_constant(b) || const_name(b) != "tactic")
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throw exception("tactic namespace declarations have been modified, "
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"function 'tactic.apply' is expected to return a 'tactic'");
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}
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}
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return true;
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}
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}
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return false;
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}
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}
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