28 lines
688 B
C++
28 lines
688 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 "kernel/environment.h"
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namespace lean {
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bool has_heq_decls(environment const & env) {
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auto d = env.find(name({"heq", "refl"}));
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if (!d)
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return false;
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if (length(d->get_univ_params()) != 1)
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return false;
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expr type = d->get_type();
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for (unsigned i = 0; i < 2; i++) {
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if (!is_pi(type))
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return type;
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type = binding_body(type);
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}
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type = get_app_fn(type);
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if (!is_constant(type))
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return false;
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return const_name(type) == "heq";
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}
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}
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