perl parser is not interested in spaces until the code it's clear, at least from perl point of view.
This is a good thing for you, infact you can print a boublequoted string as multiline expression.
If you by other hand insert (even if allowed) white spaces between sigils and identifiers, you are somehow shooting on your own feet.
Anyway perlintro states:
> Whitespace is irrelevant:
print
"Hello, world"
;
L*
There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.
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