Fix OverridingPairs

OverridingPairs had several bugs which caused pairs to be lost, which caused
missing overrides checks. Fixing OverridingPairs revealed several test failures
(and a problem in Synthetics generation which was fixed in the last commit).
Tests that became negative are all moved into neg/overrides.scala, and the
original versions in pos were fixed.

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/neg/over.scala b/tests/neg/over.scala
new file mode 100644
index 000000000..488d71614
--- /dev/null
+++ b/tests/neg/over.scala
@@ -0,0 +1,10 @@
+trait T {
+  def x = 1
+}
+
+class C extends T {
+
+  val x = 2
+  override val y = 2
+
+}