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object TooManyParens {
def f = Map(1 -> 2).keySet()
//
// Confusion reigns!
//
// work/a.scala:27: error: not enough arguments for method apply: (elem: Int)Boolean in trait SetLike.
// Unspecified value parameter elem.
// def f = Map(1 -> 2).keySet()
// ^
}
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