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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
+```