Are you sure? With perl 5.20.3:

$ perl -wE 'given (1) {2}'
given is experimental at -e line 1.
Useless use of a constant (2) in void context at -e line 1.
$ perl -wE 'given (1) {2}' 2> /tmp/err
$ cat /tmp/err
given is experimental at -e line 1.
Useless use of a constant (2) in void context at -e line 1.
$

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In reply to Re^3: Experimental warnings with given/when by hippo
in thread Experimental warnings with given/when by Bod

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