gistfile1.txt

scala -Ywarn-adapted-args -language:_
Welcome to Scala 2.12.8 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_192).
Type in expressions for evaluation. Or try :help.

scala> def printInt(i: Int) = println(i)
printInt: (i: Int)Unit

scala> implicit def toOneInt(is: (Int, Int)): Int = is._1 + is._2
toOneInt: (is: (Int, Int))Int

scala> printInt(10, 20)
<console>:14: warning: Adapting argument list by creating a 2-tuple: this may not be what you want.
        signature: printInt(i: Int): Unit
  given arguments: 10, 20
 after adaptation: printInt((10, 20): Int)
       printInt(10, 20)
               ^
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