I'm having some fun playing with compiler, and I'm starting to wonder what the best way to give you feedback would be?

Should I just note what I tried which did not work, such as that any use of a hyper-assignment-operator (e.g. @a ^+= @b; ) causes a runtime exception:

Died at P6C/Util.pm line 72.

Or should I submit it as a testcase? Is there some way to indicate that the test is expected to fail?

output_is(<<'CODE', <<'OUT', "string interpolation");
sub main () {
$z = 1; @a = (1..3); $z1 = @a; 
#currently outputs: z=($z)  a=()  \=@a=($z1)
print "z=($z)  a=(@a)  \$z1=\@a=($z1)\n";
}
CODE
z=(1)  a=(1 2 3)  $z1=@a=(3)
OUT
[download]

And how to we check if something has already been reported, or what the current plans are to get rid of the sub main() requirement?

You give your email address as the contact point for the compiler, so I guess that means we should send bug reports directly to you. (unless they are disguised as a request for clarification on how to report them...)

One final test case, and I'll stop.

output_is(<<'CODE', <<'OUT', "concatenation chain");
sub main() {
        @a = (2,4,8);
        print @a _ "\n";        # OK: 3
        print @a ^_ "\n";       # OK: 2\n4\n8\n
        print @a ^_ "\t" _ "\n";        # BAD: ''
        print (@a ^_ "\t");             # OK: 2\t4\t8\t
        print "next\n";
        print "--" _ (@a ^_ "\t");      # BAD: --
        print "next\n";
        print ((@a ^_ "\t") _ "\n");    # BAD: ''
        print "stop\n";
}
CODE
3
2
4
8
2       4       8
2       4       8       next
--2     4       8       next
2       4       8
stop
OUT
[download]