It's not only 'string', look:

42;

is just as silent.

Please go to comp.lang.perl.misc or similar, where very basic Perl
questions such as yours are answered.

> Hi,
> 
> sorry for offtopic and silly question
> 
> friend of mine just learning perl has asking me what does
> 'string';  means. Perl seems just silently ignores this
> 'statement' No warning, no action. Is it a known feature ?
> 
>       Regards,
> 
>               Oleg

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