for an eighty-column terminal under ‘use diagnostics’
=item Invalid separator character %s in PerlIO layer specification %s
-(W layer) When pushing layers onto the Perl I/O system, something other than a
-colon or whitespace was seen between the elements of a layer list.
+(W layer) When pushing layers onto the Perl I/O system, something other
+than a colon or whitespace was seen between the elements of a layer list.
If the previous attribute had a parenthesised parameter list, perhaps that
list was terminated too soon.