29 lines
988 B
C++
29 lines
988 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/find_fn.h"
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#include "kernel/inductive/inductive.h"
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namespace lean {
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bool is_recursive_datatype(environment const & env, name const & n) {
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optional<inductive::inductive_decls> decls = inductive::is_inductive_decl(env, n);
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if (!decls)
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return false;
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for (inductive::inductive_decl const & decl : std::get<2>(*decls)) {
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for (inductive::intro_rule const & intro : inductive::inductive_decl_intros(decl)) {
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expr type = inductive::intro_rule_type(intro);
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while (is_pi(type)) {
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if (find(binding_domain(type), [&](expr const & e, unsigned) {
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return is_constant(e) && const_name(e) == n; }))
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return true;
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type = binding_body(type);
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}
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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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