I've made #4 work finally:
while prompt qq/Please input a number (>1):\n/ -> $_ {
say $_;
}
A lot of unexpected things:
1. For some reason, Rakudo does not recognize the "LOOP:" construct, I just can't use "goto LOOP" to jump to a label.
2. The simple "while(<>){}" idiom doesn't work anymore. Though I've heard that "for =<> {}" is one alternative, but it seems that Rakudo doesn't support it yet.
3. The compiler suggest me to use "lines()" instead of "while(<>)", but "lines()" slurps all the input, so I can't input line by line, luckily there is a "prompt" function instead.
4. Since "while(<>){}" does not work, the implicit variable is not assigned, so I have to explicitly assign it by: "-> $_".
5. For some reason, bare function "chomp" and "say" does not work any more, I have to pass the parameter "$_" explicitly.
6. But the chomp function is not necessary anymore, the NL is automatically chomped. This sounds like the "perl5 -l" option, I guess we will need a "perl6 -L" option to do the inverse in the future?
I am surprised that Perl6 is so much different from Perl5.
But the code does become much shorter and clearer, at least from this example.
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