Fix #4196: TailRec-optimize methods returning implicit function types #4197
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A transformX method can return a Thicket of trees that need to be transformed by subsequent phases, but so far this wasn't the case. No testcase, but this is necessary to make the next commit work properly as `ShortcutImplicits` returns a Thicket of DefDefs that need to be transformed by TailRec
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…types Before `ShortcutImplicits`, calls to such methods are never in tail position since we call `.apply` on them to pass the implicit arguments. By moving `ShortcutImplicits` before `TailRec` we avoid this problem.
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odersky
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Mar 29, 2018
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