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    $ perl -wle'print q{@@x} =~ m|\A\Q@@x\E\z| ? "match" : "no match"'
    Possible unintended interpolation of @x in string at -e line 1.
    ...
    
    $ perl -wle'print q{@@x} =~ m|\A@\@x\z| ? "match" : "no match"'
    match