gistfile1.txt

zoffix@leliana:/tmp/tmp.m0TGnHo3HC$ perl6 -v
This is Rakudo version 2016.07.1-151-g5dd91d8 built on MoarVM version 2016.07-17-g40948f6
implementing Perl 6.c.
zoffix@leliana:/tmp/tmp.m0TGnHo3HC$ tree
.
└── lib
    └── JSON
        └── Fast.pm6

2 directories, 1 file
zoffix@leliana:/tmp/tmp.m0TGnHo3HC$ cat lib/JSON/Fast.pm6 
unit class JSON::Fast;

method new { say "hello!" }
zoffix@leliana:/tmp/tmp.m0TGnHo3HC$ perl6 -MJSON::Fast -e 'JSON::Fast.new'
You cannot create an instance of this type (JSON::Fast)
  in block <unit> at -e line 1

zoffix@leliana:/tmp/tmp.m0TGnHo3HC$ perl6 -Ilib -MJSON::Fast -e 'JSON::Fast.new'
hello!
zoffix@leliana:/tmp/tmp.m0TGnHo3HC$