(This message was sent to the olena-patches list but did not appear in the lrde.olena.patches newsgroup, so I'm posting it again. Sorry for the duplicate message in olena-patches.) https://svn.lrde.epita.fr/svn/oln/trunk/metalic Index: ChangeLog from Roland Levillain &lt;roland(a)lrde.epita.fr&gt; Fix mlc::is_ok definition. * mlc/cmp.hh (mlc::is_ok): Add missing template declarator. cmp.hh | 1 + 1 file changed, 1 insertion(+) Index: mlc/cmp.hh --- mlc/cmp.hh (revision 401) +++ mlc/cmp.hh (working copy) @@ -106,6 +106,7 @@ /// Check whether a type is a sound (supposedly before using it). + template <typename T> struct is_ok : public ands_< neq_<T, not_found>, neq_<T, not_ok>, neq_<T, undefined > >