Make Valid and Fail case classes

That ensures

  Ok(x) == Ok(x)
  Err(y) == Err(y)

Author: odersky

library/src/scala/magic/runtime/Fail.scala

@@ -3,5 +3,4 @@ package scala.magic.runtime
 import annotation.experimental
 
 @experimental
-class Fail[+E](val elem: E):
-  override def toString = s"Fail($elem)"
+case class Fail[+E](elem: E)

library/src/scala/magic/runtime/Valid.scala

@@ -3,4 +3,4 @@ package scala.magic.runtime
 import annotation.experimental
 
 @experimental
-class Valid(val elem: Any)
+case class Valid(elem: Any)

tests/pos/maybe-translation.scala …run-bootstrapped/maybe-translation.scalatests/pos/maybe-translation.scala renamed to tests/run-bootstrapped/maybe-translation.scala tests/pos/maybe-translation.scala renamed to tests/run-bootstrapped/maybe-translation.scala

@@ -95,3 +95,11 @@ def baz(x: Int ? String) =
         }
       ):Object:Object
 */
+
+@main def Test =
+  assert(foo(6) == 6)
+  assert(foo(11) == null)
+  assert(bar(6) == 6)
+  assert(bar(-1) == null)
+  assert(baz(6) == 6)
+  assert(baz(-1) == Err("not positive"), baz(-1))

tests/run/i1773-maybe.scala

@@ -1,5 +1,6 @@
 //> using options -Yexplicit-nulls
 import language.experimental.magic
+import language.implicitConversions
 object Test {
   into class Foo(sc: StringContext) {
     object q {