True. But before we even start talking about unit tests, it would be nice to have

perl -wc Foo.pm
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at least come up with the "Foo.pm syntax ok" message and without raising any warnings.

Given

package Foo;
42;
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this would give "syntax ok" but also the "useless use of constant in void context" warning, whereas

package Foo;
1;
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would only give the "syntax ok" message.