SI-7120 Erasure must honor typeref prefixes

Erasure was discarding these, which led to unnecessarily
wide types in quite particular circumstances. This showed
up as a double definition error in the reported bug when the
bridge method clashed with the erased signature.

1 files changed, 27 insertions, 0 deletions

diff --git a/test/files/run/t7120b.scala b/test/files/run/t7120b.scala
new file mode 100644
index 0000000000..9f6591aa06
--- /dev/null
+++ b/test/files/run/t7120b.scala
@@ -0,0 +1,27 @@
+trait Base[A] { type B = A; }
+class C extends Base[String] {
+  class D {
+    def foo[B1 <: B](b: B1) = 0
+  }
+}
+
+trait BaseHK[M[_], A] { type B = M[A]; }
+object BaseHK { type Id[X] = X }
+class CHK extends BaseHK[BaseHK.Id, String] {
+  class D {
+    def foo[B1 <: B](b: B1) = 0
+  }
+}
+
+
+object Test extends App {
+  val c = new C
+  val d = new c.D()
+  val meth = d.getClass.getMethods.find(_.getName == "foo").get
+  println(meth)
+
+  val chk = new CHK
+  val dhk = new chk.D()
+  val methhk = d.getClass.getMethods.find(_.getName == "foo").get
+  println(methhk)
+}