add tests from scala/test/files/{pos,neg}

with explicit Unit return type

1 files changed, 36 insertions, 0 deletions

diff --git a/tests/untried/pos/t7753.scala b/tests/untried/pos/t7753.scala
new file mode 100644
index 000000000..80e2f1c66
--- /dev/null
+++ b/tests/untried/pos/t7753.scala
@@ -0,0 +1,36 @@
+import scala.language.{ higherKinds, implicitConversions }
+
+trait Foo { type Out }
+
+trait SI {
+  val instance: Foo
+  type Out
+}
+
+object Test {
+  def test: Unit = {
+    def indirect(si: SI)(v: si.instance.Out) = v
+
+    val foo: Foo { type Out = Int } = ???
+    def conv(i: Foo): SI { type Out = i.Out; val instance: i.type } = ???
+
+    val converted = conv(foo)
+
+    val v1: Int = indirect(converted)(23)  // Okay (after refining the return type `instance` in the return type of `conv`)
+    /*
+    indirect(converted){(v: converted.instance.Out)converted.instance.Out}(
+      23{Int(23)}
+    ){converted.instance.Out};
+    */
+
+    val v2: Int = indirect(conv(foo))(23)  // Used to fail as follows:
+    /*
+    indirect(
+        conv(foo){si.SI{type Out = foo.Out; val instance: si.Test.<refinement>.type}}
+    ){(v: si.instance.Out)si.instance.Out}(
+      23{<error>}
+    ){<error>};
+    */
+
+  }
+}