Another test

from conversation with Alex

Author: odersky

tests/neg-custom-args/captures/eta.scala

@@ -0,0 +1,7 @@
+    type Proc = (() -> Unit)
+     def foo(f: {*} Proc): {} Proc =
+       def bar[A <: {f} Proc](g: () -> A): () -> {f} Proc =
+         g
+       val stowaway: () -> {f} Proc =
+         bar( () => f )  // error
+       () => { stowaway.apply().apply() }