Add tasty Show type class and us in Tasty.XYZ.show #4577
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For XYZ: Tree, TypeOrBoundTree, TypeOrBound and Constant
nicolasstucki
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liufengyun
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May 25, 2018
| import scala.tasty.Tasty | ||
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| class TastyPrinter[T <: Tasty with Singleton](val tasty: T) { | ||
| class ShowExtractors[T <: Tasty with Singleton](tasty0: T) extends Show[T](tasty0) { |
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I hope the name ShowExtractors can be improved later if possible.
Blaisorblade
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May 25, 2018
Without this change, `showExtractors` is unstable and so is `showExtractors.tasty`, so `showExtractors.showTypeOrBounds`'s type gets approximated from `showExtractors.tasty.TypeOrBounds` to its bounds (`Any` or `Nothing` depending on variance), so the additions to the testcase fail. The same applies to other members. I also tried replacing `tasty.Tree` with `T#Tree` (and so on), but apparently those two types aren't considered equal, at least by Scalac (which is arguably a bug). Relates to code added in scala#4577.
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| // ===== Show ===================================================== | ||
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| def defaultShow: Show[this.type] = showExtractors |
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Using def here makes the member unstable problems, see c9dbecc — I'm not using the API you used, but I'd expect both to work as they usually do.
Blaisorblade
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May 26, 2018
Without this change, `showExtractors` is unstable and so is `showExtractors.tasty`, so `showExtractors.showTypeOrBounds`'s type gets approximated from `showExtractors.tasty.TypeOrBounds` to its bounds (`Any` or `Nothing` depending on variance), so the additions to the testcase fail. The same applies to other members. I also tried replacing `tasty.Tree` with `T#Tree` (and so on), but apparently those two types aren't considered equal, at least by Scalac (which is arguably a bug). Relates to code added in scala#4577.
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For XYZ: Tree, TypeOrBoundTree, TypeOrBound and Constant