Return error indicator. C<PerlIOBase_error()> is normally sufficient.
-Returns 1 if there is an error (usually when C<PERLIO_F_ERROR> is set,
+Returns 1 if there is an error (usually when C<PERLIO_F_ERROR> is set),
0 otherwise.
=item Clearerr
=head2 Extension Layers
-Layers can made available by extension modules. When an unknown layer
+Layers can be made available by extension modules. When an unknown layer
is encountered the PerlIO code will perform the equivalent of :
use PerlIO 'layer';