From f62e280825422c1e64c2427bc5958869662701ca Mon Sep 17 00:00:00 2001
From: Jason Zaugg <jzaugg@gmail.com>
Date: Fri, 7 Feb 2014 11:52:55 +0100
Subject: SI-8244 Fix raw type regression under separate compilation

In #1901, handling of raw types encountered in signatures during class
file parsing was changed to work in the same manner as
`classExistentialType`, by using
`existentialAbstraction(cls.tparms, cls.tpe_*)`

But this never creates fresh existential symbols, and just sticks
the class type parameters it `quantified`:

	scala> trait T[A <: String]
	defined trait T

	scala> val cls = typeOf[T[_]].typeSymbol
	cls = trait T#101864

	scala> cls.typeParams
	res0 = List(type A#101865)

	scala> cls.tpe_*
	res1 = T#101864[A#101865]

	scala> classExistentialType(cls)
	res3 = T#101864[_ <: String#7209]

	scala> val ExistentialType(quantified, result) = res3
	List(type A#101865)

In the enclosed test case, this class type parameter was substituted
during `typeOf[X] memberType sym`, which led us unsoundly thinking
that `Raw[_]` was `Raw[X]`.

I've added a TODO comment to review the other usages of
`classExistentialType`.

Test variations include joint and separate compilation, and the
corresponding Scala-only code. All fail with type errors now,
as we expect. I've also added a distillation of a bootstrap
error that failed when I forgot to wrap the `existentialType`.
---
 test/files/neg/t8244b.scala | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 test/files/neg/t8244b.scala

(limited to 'test/files/neg/t8244b.scala')

diff --git a/test/files/neg/t8244b.scala b/test/files/neg/t8244b.scala
new file mode 100644
index 0000000000..2fb4f451a1
--- /dev/null
+++ b/test/files/neg/t8244b.scala
@@ -0,0 +1,18 @@
+class Raw_1[T]{
+  def raw(): Raw_1[_] = { new Raw_1[String] { def t() = "" } }
+  def t(): T
+}
+
+
+class X extends Raw_1[X] {
+  override def t = this
+  def exxx = 0
+}
+
+object Test extends App {
+  def c(s: X) = {
+    val raw = s.raw
+    raw.t.exxx
+  }
+  c(new X())
+}
-- 
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