Fix problem involving classtag based pattern matches.

Rewriting did not go far enough, as evidenced by pos/i1174.scala

Fixes #1174

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/pos/i1174.scala b/tests/pos/i1174.scala
new file mode 100644
index 000000000..5875a38ad
--- /dev/null
+++ b/tests/pos/i1174.scala
@@ -0,0 +1,19 @@
+import scala.reflect.ClassTag
+import scala.util._
+
+object Main {
+  class A
+
+  def constructAs[TTT <: A](implicit ev: ClassTag[TTT]): Try[TTT] = Try {
+    new A()
+  }.flatMap {
+    case ev(inst) =>
+      val b: TTT = inst
+      Success(inst)
+    case inst: TTT =>
+      Success(inst)
+    case _ =>
+      val tag = implicitly[ClassTag[TTT]]
+      Failure(new ClassCastException(s"Failed to construct instance of class ${tag.runtimeClass.getName}"))
+  }
+}