squash: put each file in its own separate scope

[mauke]

This way pragmas and lexical variables don't leak from one module section to the next in ack-standalone.

[mauke]

This might fix Perl/perl5#22013; I haven't tried.

[petdance]

Thanks, done. ed82082

[haarg]

What was the reason for avoiding the separate scope for ack? That has caused this to still fail on perl 5.39.8.

[petdance]

I didn't think it was necessary. If it's a problem I can scope the main ack part.

[rjbs]

The problem is that the program is now like this:

use 5.010;
{
  package X;
  use 5.010;
}

That isn't permitted. This is a silly rule, and will go away in the next monthly perl release. But meantime, ack-standalone remains a problem for the test suite. I think it's reasonable to wait for the next release, but meantime this problem will persist.

[petdance]

OK, done. 23b156a