SIP: Curried varargs

Scala Improvement Process
94

Current master seems to…

12:57:14 $ bin/dotr
Starting dotty REPL...
scala> class Token(str: String)
// defined class Token

scala> given Conversion[String, Token] = new Token(_)
def given_Conversion_String_Token: Conversion[String, Token]

scala> def x: Token = "foo"
1 |def x: Token = "foo"
  |               ^^^^^
  |Use of implicit conversion trait Function1 in package scala should be enabled
  |by adding the import clause 'import scala.language.implicitConversions'
  |or by setting the compiler option -language:implicitConversions.
  |See the Scala docs for value scala.language.implicitConversions for a discussion
  |why the feature should be explicitly enabled.
def x: Token
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