libb-hooks-op-check-perl 0.19-2 (amd64 binary) in ubuntu utopic

 B::Hooks::OP::Check provides an interface for XS modules to hook into the
 callbacks of PL_check, which is part of perl's core. It allows a C function to
 be invoked as the last stage of optree compilation, depending on the given op
 code number (op_type).