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---
title: Raku tuple type annotation
date: 2019-12-29
layout: post
lang: en
ref: raku-tuple-type-annotation
---
```perl
# 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:
```perl
===SORRY!=== Error while compiling /path/to/my/file
Malformed return value
```
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