An imemu attempt: cannot sort list

[Tom Browder]

I have a working solution (albeit rudimentary) to adding imenu support to
my fork of "perl6-mode" at <github.com/tbrowder/perl6-mode>, but I can't
get the two index subcategory lists to sort.

Could someone look at my solution (branch "my-branch") and suggest a fix
for sorting the lists?

Thanks so much.

Best regards,

-Tom