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#!/usr/bin/perl

...

say "foo is '$foo' and baz is '@baz' in main";
say "Perl version is $] and Readonly version is $Readonly::VERSION";

Use of uninitialized value $foo in concatenation (.) or string at read
+only_fail.pl line 11.
foo is '' and baz is 'glug argh' in main
Perl version is 5.020003 and Readonly version is 2