Made -Xfatal-warnings less immediately fatal.

Instead of changing warnings to errors mid-stream, at the end of
a run I check for condition "no errors, some warnings, and fatal
warnings" and then generate an error at that point.  This is
necessary to test for some warnings which come from later stages.

1 files changed, 7 insertions, 5 deletions

diff --git a/test/files/neg/virtpatmat_reach_sealed_unsealed.check b/test/files/neg/virtpatmat_reach_sealed_unsealed.check
index 10638eff52..064a12bcaa 100644
--- a/test/files/neg/virtpatmat_reach_sealed_unsealed.check
+++ b/test/files/neg/virtpatmat_reach_sealed_unsealed.check
@@ -1,14 +1,16 @@
-virtpatmat_reach_sealed_unsealed.scala:16: error: match may not be exhaustive.
+virtpatmat_reach_sealed_unsealed.scala:16: warning: match may not be exhaustive.
 It would fail on the following input: false
   (true: Boolean) match { case true => } // not exhaustive, but reachable
        ^
-virtpatmat_reach_sealed_unsealed.scala:18: error: unreachable code
+virtpatmat_reach_sealed_unsealed.scala:18: warning: unreachable code
   (true: Boolean) match { case true => case false =>  case _ => } // exhaustive, last case is unreachable
                                                              ^
-virtpatmat_reach_sealed_unsealed.scala:19: error: unreachable code
+virtpatmat_reach_sealed_unsealed.scala:19: warning: unreachable code
   (true: Boolean) match { case true => case false =>  case _: Boolean => } // exhaustive, last case is unreachable
                                                                       ^
-virtpatmat_reach_sealed_unsealed.scala:20: error: unreachable code
+virtpatmat_reach_sealed_unsealed.scala:20: warning: unreachable code
   (true: Boolean) match { case true => case false =>  case _: Any => } // exhaustive, last case is unreachable
                                                                   ^
-four errors found
+error: No warnings can be incurred under -Xfatal-warnings.
+four warnings found
+one error found