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| import java.io.PrintStream | |
| def log(m: String) | |
| (implicit o: PrintStream, | |
| prefix: String): Unit = o.println(s"[$prefix] $m") | |
| implicit val out: PrintStream = System.out | |
| def ?[T](implicit w: T): T = w | |
| log("!!! MSG !!!")(?, "prefix") | |
| // ^-- wildcard |
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