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perf(library/elaborator): avoid exception

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2013-12-10 19:40:10 -08:00
parent 4de5f06a97
commit f8e87436a7
1 changed files with 3 additions and 1 deletions
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4
src/library/elaborator/elaborator.cpp
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@ -224,7 +224,9 @@ class elaborator::imp {
/** \brief Return true iff \c a is a proposition */
bool is_proposition(expr const & a, context const & ctx) {
if (is_metavar(a)) {
if ((is_metavar(a)) ||
(is_app(a) && is_metavar(arg(a, 0))) ||
(is_abstraction(a) && (is_metavar(abst_domain(a)) || is_metavar(abst_body(a))))) {
// Avoid exception at m_type_inferer.
// Throw is expensive in C++.
return false;