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This reverts commit 5c5e8d4dcd151a6e2bf9e7c259c618b9b4eff00f.
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Changed behavior so that when determining the target variance of a method parameter,
the variance in formals comes first. If variance is still undecided by that,
the variance in the result type is used as a secondary criterion.
(This is also done when determining prototype type params.)
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The inference failure itself seems like an instance of of SI-3346.
But dependent method types (which triggered the crash), can be employed
to avoid inferring the type constructor CC.
class Num[T] {
def mkOps = new Ops
class Ops { def +++(rhs: T) = () }
}
class A {
implicit def infixOps[T](lhs: T)(implicit num: Num[T]): num.Ops = num.mkOps
implicit val n1: Num[Int] = new Num[Int] { }
5 +++ 5
}
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