negligence.
p4raw-id: //depot/perl@17737
=item PERLIO
A space (or colon) separated list of PerlIO layers. If perl is built
-to use PerlIO system for IO (the default) these layers affect perl's IO.
+to use PerlIO system for IO (the default) these layers effect perl's IO.
It is conventional to start layer names with a colon e.g. C<:perlio> to
emphasise their similarity to variable "attributes". But the code that parses