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perl -we "use strict; {;} no strict 'refs';"

F:\Perl>perl -we "use strict; {qw(key val)}; no strict 'refs';"
Useless use of a constant in void context at -e line 1.
...

F:\Perl>perl -we "use strict; ({qw(key val)}); no strict 'refs';"
Useless use of single ref constructor in void context at -e line 1