Errors when writing disambiguation files

[JJ]

The problem

There are a couple of errors this way:

Use of uninitialized value of type Any in string context.
Methods .^name, .perl, .gist, or .say can be used to stringify it to something meaningful.
  in sub english-list at /home/jmerelo/Code/forks/perl6/doc/lib/Perl6/Documentable.pm6 (Perl6::Documentable) line 28

Suggestions

Disambiguation files will probably go #2499, but this is a common error with htmlify.p6 (also #1823). It catches errors very late, and does not give a hint of where or why the error is produced. It's in Pod6::Documentable in this case...