SI-8177 refine embeddedSymbols

We look for any prefix that has a refinement class for a type symbol.
This includes ThisTypes, which were not considered before.

pos/t8177g.scala, neg/t0764*scala now compile, as they should

Additional test cases contributed by Jason & Paul.

1 files changed, 12 insertions, 0 deletions

diff --git a/test/files/pos/t8177d.scala b/test/files/pos/t8177d.scala
new file mode 100644
index 0000000000..d15a05a359
--- /dev/null
+++ b/test/files/pos/t8177d.scala
@@ -0,0 +1,12 @@
+// exercise coevolveSym
+trait HasElem { type A }
+trait View[AIn] {
+  val tc: HasElem { type A = AIn }
+  def f2(p: tc.A): tc.A = p
+}
+
+object Test {
+  val view: View[Int] = null
+
+  view f2 5  // fails
+}