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untyped macros still typecheck type arguments #6972

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scabug opened this Issue Jan 14, 2013 · 5 comments

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scabug commented Jan 14, 2013

E.g. one can't use untyped macros to implement vararg type parameters.

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scabug commented Jan 14, 2013

Imported From: https://issues.scala-lang.org/browse/SI-6972?orig=1
Reporter: @xeno-by
Affected Versions: macro-paradise

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scabug commented Feb 13, 2013

@milessabin said:
I would like to be able to have type arguments with unspecified kind, ie. given Foo, Bar[], Baz[, _] etc. I would like to able to write a type macro which could be applied to all of them, ie. TypeMacro[Foo], TypeMacro[Bar], TypeMacro[Baz] given the above definitions. For applications see kind polymorphism in GHC.

Something along these lines could also provide smoother mechanism for type constructor partial application.

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scabug commented Mar 1, 2013

@xeno-by said:
Please let me know whether this is a blocker for you. Otherwise I'd tend to other things, which have materialized in great numbers during the last couple of weeks.

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scabug commented Mar 1, 2013

@milessabin said:
It's not a blocker, but I can see it being generally useful. The kind polymorphism angle might also give you some purchase on type tags for type constructors of arbitrary arity ...

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scabug commented Aug 5, 2013

@xeno-by said (edited on Aug 5, 2013 2:09:50 PM UTC):
Untyped macros are discontinued: http://scalamacros.org/news/2013/08/05/macro-paradise-2.0.0-snapshot.html

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