As a kibitzer, I tried that with "This is Rakudo version 2017.04.3 built on MoarVM version 2017.04-53-g66c6dda implementing Perl 6.c". and got:
perl6 –e "my \foo = Callable but role:: { };"
Could not open –e. Failed to stat file: no such file or directory
while:
perl6 -e "say 'boo'"
boo
worked just fine, as you can see.
