Raku tuple type annotation

Posted on December 29, 2019
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# 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);
}

Error log is:

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===SORRY!=== Error while compiling /path/to/my/file
Malformed return value