Creating case classes in preference to passing ...

Creating case classes in preference to passing around a variety of
inscrutable tuples. And, fix and test case for #1697. There remain
serious extractor issues which I hope to have fully diagnosed in the
near future.

1 files changed, 19 insertions, 0 deletions

diff --git a/test/files/run/bug1697.scala b/test/files/run/bug1697.scala
new file mode 100644
index 0000000000..3f7cb467cd
--- /dev/null
+++ b/test/files/run/bug1697.scala
@@ -0,0 +1,19 @@
+class Term
+case class Num(n: Int) extends Term
+case class Add(x: Term, y: Term) extends Term
+
+object Value {
+  def unapply(term: Any): Boolean = true
+}
+
+object Test {
+  def main(args: Array[String]) {
+    val term = Add(Num(1), Add(Num(2), Num(3)))
+    val res = term match {
+      case Add(Num(x), Num(y))    => "Add(Num, Num)"
+      case Add(Value(), y)        => "Add(Value, ?)"
+      case _                      => "?"
+    }
+    assert(res == "Add(Value, ?)")
+  }
+}
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