Use * as a placeholder in addition to ?.
#91
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Motivation: There is a proposal for F[?] to denote a wildcard (currently F[_]) in Scala 3.0+ and F[_] to be a shorthand syntax for type lambda (F[?] with current kind-projector syntax) in Scala 3.3+ (see scala/scala3#5379). Supporting an additional placeholder will allow users to gradually move from `?` to `*` before Scala 3.0 is out. Resolves typelevel#84.
LukaJCB
approved these changes
Feb 21, 2019
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Seems like a reasonable idea. 👍 (If we think of a better symbol than |
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Can there be a way to disable this? I'm actually using |
This was referenced Jun 25, 2019
milessabin
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Jul 3, 2019
The plan for Dotty is to repurpose `?` for wildcards instead of `_`. In typelevel#91 `*` was added to kind-projecter as alternative placeshold syntax to `?`, and Dotty now also supports `*` as placeholder syntax for cross compilation via `-Ykind-projector`. This PR updates the documentation and examples to use `*` rather than `?` and adds a warning that the `?` syntax will be deprecated in future.
sirocchj
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Oct 3, 2019
The plan for Dotty is to repurpose `?` for wildcards instead of `_`. In typelevel#91 `*` was added to kind-projecter as alternative placeshold syntax to `?`, and Dotty now also supports `*` as placeholder syntax for cross compilation via `-Ykind-projector`. This PR updates the documentation and examples to use `*` rather than `?` and adds a warning that the `?` syntax will be deprecated in future.
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Motivation:
There is a proposal for
F[?]to denote a wildcard (currentlyF[_]) in Scala 3.0+ andF[_]to be a shorthand syntax for type lambda (F[?]with current kind-projector syntax) in Scala 3.3+ (seescala/scala3#5379).
Supporting an additional placeholder will allow users to gradually move from
?to*before Scala 3.0 is out.Resolves #84.