if (my $result = some_func()) {
# do something with $result
}
I use this construct all the time, and am not aware of any problems with it. The conditional is testing the return value of the assignment, which is true if some_func() returns something true. If it's false, then $result gets whatever false value was returned and the block does not execute (or the compiler may optimize away the assignment completely -- I don't know how that works.)
Off hand, I can't think of any reason why this would not also be allowed in Perl 6.
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