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See i321 doc for description of problem and decision taken.
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arguments.
Or it could lead to Ycheck error that was triggered in #321.
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One test (t2613) required lifting a hard recursion limit in findMember
(used for debug only, will be removed in the future). The same test
also requires -Yno-deep-subtypes to be reset, so it's in pos_special
instead of pos.
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Nested methods cannot refer to labels in theior environment. Needs a fix in TailCalls.
Moved failing test to pending.
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Avoids characterizing the "from" link in a return as a tail call
reference.
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Test for order of type parameters in recursive call
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t6574 has a new test where we produce identical code in an if-then-else. This broke
the rewiring logic before, and is fixed now.
Also, more comments and test cases.
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Ported tailcall phase from scalac with such changes:
- all transformation is done in the phase itself
(previously half of the work was done in backend)
- it is now able to run before uncurry
- it is now a treeTransform
- renamed to tailrec to make it more obvious that
this phase transforms only recursive calls.
For now this is a single phase which speculatively
transforms DefDefs.
Speculation can be potentially removed by
splitting into 2 phases:
one detecting which methods should be transformed
second performing transformation.
But, as transformation requires as same amount of work
as detection, I believe it will be simpler to maintain
it as a single phase.
Conflicts:
tests/pos/typers.scala
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