SI-7596 Curtail overloaded symbols during unpickling

In code like:

    object O { val x = A; def x(a: Any) = ... }
    object P extends O.x.A

The unpickler was using an overloaded symbol for `x` in the
parent type of `P`. This led to compilation failures under
separate compilation.

The code that leads to this is in `Unpicklers`:

    def fromName(name: Name) = name.toTermName match {
      case nme.ROOT     => loadingMirror.RootClass
      case nme.ROOTPKG  => loadingMirror.RootPackage
      case _            => adjust(owner.info.decl(name))
    }

This commit filters the overloaded symbol based its stability
unpickling a singleton type. That seemed a slightly safer place
than in `fromName`.

6 files changed, 65 insertions, 0 deletions

diff --git a/test/files/pos/t7596/A_1.scala b/test/files/pos/t7596/A_1.scala
new file mode 100644
index 0000000000..6303c6d132
--- /dev/null
+++ b/test/files/pos/t7596/A_1.scala
@@ -0,0 +1,10 @@
+trait Driver {
+  abstract class Table
+}
+
+object Config {
+  val driver : Driver = ???
+  def driver(a: Any) = ???
+}
+
+object Sites extends Config.driver.Table
diff --git a/test/files/pos/t7596/B_2.scala b/test/files/pos/t7596/B_2.scala
new file mode 100644
index 0000000000..977e5c8bd1
--- /dev/null
+++ b/test/files/pos/t7596/B_2.scala
@@ -0,0 +1,19 @@
+object Test {
+  locally {
+    Sites: Config.driver.Table
+  }
+}
+
+// Under separate compilation, the pickler is foiled by the 
+// overloaded term `Config.driver`, and results in:
+
+// qbin/scalac test/files/pos/t7596/A_1.scala && qbin/scalac -explaintypes test/files/pos/t7596/B_2.scala
+// test/files/pos/t7596/B_2.scala:3: error: type mismatch;
+//  found   : Sites.type
+//  required: Config.driver.Table
+//     Sites: Config.driver.Table
+//     ^
+// Sites.type <: Config.driver.Table?
+//   Driver.this.type = Config.driver.type?
+//   false
+// false
\ No newline at end of file
diff --git a/test/files/pos/t7596b/A.scala b/test/files/pos/t7596b/A.scala
new file mode 100644
index 0000000000..65c1bc56ef
--- /dev/null
+++ b/test/files/pos/t7596b/A.scala
@@ -0,0 +1,10 @@
+trait H2Driver{
+    abstract class Table[T]
+}
+
+object Config {
+  val driver : H2Driver = ???
+  def driver(app: Any): H2Driver = ???
+}
+
+class Sites extends Config.driver.Table[String]
diff --git a/test/files/pos/t7596b/B.scala b/test/files/pos/t7596b/B.scala
new file mode 100644
index 0000000000..cbcf149c23
--- /dev/null
+++ b/test/files/pos/t7596b/B.scala
@@ -0,0 +1,6 @@
+class DAOBase[E]{
+  type TableType <: Config.driver.Table[E]
+}
+class SitesDAO extends DAOBase[String]{
+  type TableType = Sites
+}
diff --git a/test/files/pos/t7596c/A_1.scala b/test/files/pos/t7596c/A_1.scala
new file mode 100644
index 0000000000..3e366df477
--- /dev/null
+++ b/test/files/pos/t7596c/A_1.scala
@@ -0,0 +1,11 @@
+trait Driver {
+  abstract class Table
+}
+
+object Config {
+  val driver : Driver = ???
+  val driverUniqueName: driver.type = driver
+  def driver(a: Any) = ???
+}
+
+object Sites extends Config.driver.Table
diff --git a/test/files/pos/t7596c/B_2.scala b/test/files/pos/t7596c/B_2.scala
new file mode 100644
index 0000000000..33da68c1ff
--- /dev/null
+++ b/test/files/pos/t7596c/B_2.scala
@@ -0,0 +1,9 @@
+object Test {
+  locally {
+    Sites: Config.driver.Table
+  }
+}
+
+// This variation worked by avoiding referring to the
+// overloaded term `Config.driver` in the parent type of
+// Sites
\ No newline at end of file