--- title: Raku tuple type annotation date: 2019-12-29 ---

``` {.raku .numberLines startFrom=""}
# 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:

``` {.text .numberLines startFrom=""}
===SORRY!=== Error while compiling /path/to/my/file
Malformed return value
```