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fix(library/type_context): prevent segfault

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Temporary metavariables appeared here when pretty-printing simp_lemmas.
This commit is contained in:
Gabriel Ebner 2017-05-18 07:26:16 +02:00 • committed by Leonardo de Moura
parent 9b86808345
commit 4528711efb
1 changed files with 1 additions and 1 deletions
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src/library/type_context.cpp
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@ -797,7 +797,7 @@ expr type_context::whnf_core(expr const & e, bool proj_reduce) {
m_used_assignment = true;
return whnf_core(m_mctx.instantiate_mvars(e), proj_reduce);
}
} else if (is_idx_metavar(e)) {
} else if (m_tmp_data && is_idx_metavar(e)) {
lean_assert(in_tmp_mode());
unsigned idx = to_meta_idx(e);
if (idx < m_tmp_data->m_eassignment.size()) {