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#! perl -slw
use strict;
...
D:\Perl\test>test
Useless use of length in void context at D:\Perl\test\test.pl8 line 7.
Useless use of private variable in void context at D:\Perl\test\test.p
+l8 line 9.

#! perl -slw
use strict;
...
D:\Perl\test>test
Useless use of private variable in void context at D:\Perl\test\test.p
+l8 line 7.
Useless use of length in void context at D:\Perl\test\test.pl8 line 9.