# !!!FIXME!!! This is slow. Sloooooow. Conceptually slow, but
# the implementation sucks badly, too. It is especially
# unnerving to me that the whole lexical scope of a myriad of
# intermediate result matrices and vectors is kept because we
# use closures. Closures are great, but not in bloated
# lexical scopes. How fix that without introducing either
# – an ugly additional method
# – ugly additional blocks to keep the scope clean. (Yuck!)

Source: Direct link to the source code
Software: META-spec
Programming language: Perl