avoid compilation error

doc/Language/pragmas.pod6

@@ -84,11 +84,13 @@ Allow for some other language constructs that were deemed to be a trap that
 warranted a warning and/or an error in normal Perl 6 programming.  Currently,
 only C<Perl5> is allowed, which disables a bunch of P5isms warnings and errors.
 
+=begin code :skip-test<compilation error>
     sub abs() { say "foo" }
     abs;
     # Unsupported use of bare "abs"; in Perl 6 please use .abs if you meant
     # to call it as a method on $_, or use an explicit invocant or argument,
     # or use &abs to refer to the function as a noun
+=end code
 
 In this case, providing an C<abs> sub that doesn't take any arguments, did
 not make the compilation error go away.