Commits on Feb 17, 2017

1. Tests for self-referential things …

   Some tests were deleted according to the rakudo pull request that
   removes the error completely. Let's take a look at the deleted tests
   one by one.
   
   The first test checks that ｢is default(%h<foo>)｣ gives “Cannot use
   variable $!name in declaration to initialize itself” error. This error
   is completely irrelevant to what actually happens. See comments
   on RT #121807.
   
   Second test makes sure that ｢my $z = $z｣ is a compile-time error. It
   could be so, but I see no basis for this. This particular case *has
   never been a problem*. All rakudo versions since 2014.01 (which is the
   first release of rakudo on moar) result in $z being Any, just like if
   you left $z uninitialized.
   
   The last test is the only one that tests for misuse (using
   self-referential things with binding). It is based on a 5 year old
   ticket that expected some completely different behavior. This code
   does not cause rakudo to blow up, but it is still something we should
   complain about compile time. After the removal of this error, this
   code will now fail during run time because @foo will end up being
   Mu. Not too bad, but could be better.
   
   Yet nothing for problematic cases that are caused by what the error is
   talking about.
   
   Instead, I've added some tests that check that self-referential
   arrays (and other self-referential things) are working correctly.
   
   It would be nice to have some sort of design decision on what should
   happen with binding. For example, we can say that getting Mu there is
   OK. See RT #87034 for further discussions.

   

   AlexDaniel committed Feb 17, 2017
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