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14 | # Single Str return value: this works
sub f1(Str $in --> Str) {
$in;
}
# Tuple of Str as return value: this works
sub f2(Str $in) {
($in, $in);
}
# Tuple of Str as return value with type annotation: this doesn't works
sub f2(Str $in --> (Str, Str)) {
($in, $in);
}
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