While trying to bridge the gap between tuples and parameter lists, the compiler is a bit too eager to insert 0-Tuples () into argument lists.
This is pretty much never what a developer wants (and we couldn't come up with a single example where the () insertion is “a good thing” in three months), but has been the cause of a lot of embarrassing behavior:
scala> List(1,2,3).toSet() res0: Boolean = false
import java.text.SimpleDateFormat val sdf = new SimpleDateFormat("yyyyMMdd-HH0000") sdf.format() java.lang.IllegalArgumentException: Cannot format given Object as a Date at java.text.DateFormat.format(DateFormat.java:301) at java.text.Format.format(Format.java:157) ...
scala> class A[T](val x: T) defined class A scala> new A res0: A[Unit] = A@5534578f
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