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It shouldn't be unreasonable to assume that, val vector = List(1, 2, 3).to[Vector] vector(1) ought to be replaceable with, List(1, 2, 3).to[Vector](1) It can't right now, and I think this is a significant part of the reason why the abstraction of implicit parameters is leaky.
Note that the current proposal in Scala 3 is to make this work as I expected. If you wanted the old Scala 2 behavior, you would have to write,
List(1, 2, 3).to[Vector].explicitly(1)
I'm fine with that as a solution, but @li_haoyi's proposal (in the GitHub thread) goes further.
"the old behavior" = "the same confusing compile error" in this particular case. I should have picked a better example. ;)
There's probably a CanBuildFrom in there.
Implicit parameters are special and declaring those arguments and passing them should have always had a separate syntax. I like @odersky's ?() and @Blaisorblade's [[]] proposals.
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