1 files changed, 63 insertions, 0 deletions
diff --git a/src/test/scala/scala/async/run/ifelse4/IfElse4.scala b/src/test/scala/scala/async/run/ifelse4/IfElse4.scala
new file mode 100644
index 0000000..b0ecf13
--- /dev/null
+++ b/src/test/scala/scala/async/run/ifelse4/IfElse4.scala
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2012-2014 Typesafe Inc. <http://www.typesafe.com>
+ */
+
+package scala.async
+package run
+package ifelse4
+
+import language.{reflectiveCalls, postfixOps}
+import scala.concurrent.{Future, ExecutionContext, future, Await}
+import scala.concurrent.duration._
+import scala.async.Async.{async, await}
+import org.junit.Test
+
+
+class TestIfElse4Class {
+
+  import ExecutionContext.Implicits.global
+  
+  class F[A]
+  class S[A](val id: String)
+  trait P
+ 
+  case class K(f: F[_])
+
+  def result[A](f: F[A]) = async {
+    new S[A with P]("foo")
+  }
+    
+  def run(k: K) = async {
+    val res = await(result(k.f))
+    // these triggered a crash with mismatched existential skolems
+    //  found   : S#10272[_$1#10308 with String#137] where type _$1#10308
+    //  required: S#10272[_$1#10311 with String#137] forSome { type _$1#10311 }
+
+    // This variation of the crash could be avoided by fixing the over-eager
+    // generation of states in `If` nodes, which was caused by a bug in label
+    // detection code.
+    if(true) {
+      identity(res)
+    }
+
+    // This variation remained after the aforementioned fix, however.
+    // It was fixed by manually typing the `Assign(liftedField, rhs)` AST,
+    // which is how we avoid these problems through the rest of the ANF transform.
+    if(true) {
+      identity(res)
+      await(result(k.f))
+    }
+    res
+  }
+}
+
+class IfElse4Spec {
+
+  @Test
+  def `await result with complex type containing skolem`() {
+    val o = new TestIfElse4Class
+    val fut = o.run(new o.K(null))
+    val res = Await.result(fut, 2 seconds)
+    res.id mustBe ("foo")
+  }
+}