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I wrote a warning when nullary methods return Unit. I wimped out of
including it in this patch because we had about 200 of them, and that's
what is fixed in this patch. I will add the warning to some kind of
"-Xlint" feature after 2.9.
This is motivated at least partly by the resolution of #4506, which
indicates the distinction between "def foo()" and "def foo" will
continue to jab its pointy stick into our eyes, so I believe we have a
minimal duty of at least following our own advice about what they mean
and not making a semirandom choice as to whether a method has parens or
not. Review by community.
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Improved @tailrec error messages to specify the reason. In the process
fixed old bug involving tail call transformation. Closes #3275, #2018.
Review by dragos.
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They are located in package scala.annotation. Also in this patch:
* numerous test cases for both annotations
* addition of @tailrec and @switch in a few strategic locations
* fixes for critical section NewScanners methods which were not being
compiled into switches, immediately proving the value of @switch
* tail recursive implementations for Iterator.{ dropWhile, drop}
and List.dropWhile tagged with @tailrec, closing bug #1376
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