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Matching on objects with lower-case first letters

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Contributed byRyan Williams, Martijn Hoekstra
Sourcescala/scala Gitter
First tested with Scala version2.12.6
+
+

What is the result of executing the following code?

+
+sealed trait obj
+case object one extends obj
+case object two extends obj
+def test(o: obj) =
+  o match {
+    case one ⇒ 1
+    case two ⇒ 2
+  }
+println(test(one))
+println(test(two))
+
+
    + +
  1. prints "1" and then "2"
    2. +
  2. throws MatchError
    3. +
  3. prints "1" and then "1"
    4. +
  4. compile error
    5. +
+
+ +