This syntax:

package foo {
  ...
}
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... only works in Perl 5.14 and above. In earlier versions of Perl, you'll need a semicolon before the block...

package foo; {
  ...
}
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Though it is in my experience more conventional to put the package declaration inside the block itself:

{
  package foo;
  ...
}
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Update: as per AnomalousMonk's post below, this latter style has the added advantage that the package declaration itself is lexically scoped, so after perl parses the closing curly brace it puts you back into the main package. I knew that already really. ;-) The new Perl 5.14 syntax also does this, but the middle example does not.