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Undefined values: Difference between revisions
→{{header|Perl 6}}
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my Str $z; say $z.WHAT; # Str()</lang>
The user-interface for definedness are type smilies and the <tt>with</tt>-statement.
<lang perl6>my Int:D $i = 1; # if $i has to be defined you must provide a default value
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