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, 6 insertions, 4 deletions

diff --git a/test/files/neg/t6011.check b/test/files/neg/t6011.check
index 5b5a861e5b..cb7f189031 100644
--- a/test/files/neg/t6011.check
+++ b/test/files/neg/t6011.check
@@ -1,10 +1,12 @@
-t6011.scala:4: error: unreachable code
+t6011.scala:4: warning: unreachable code
     case 'a' | 'c' => 1 // unreachable
                       ^
-t6011.scala:10: error: unreachable code
+t6011.scala:10: warning: unreachable code
     case 'b' | 'a'  => 1 // unreachable
                        ^
-t6011.scala:8: error: could not emit switch for @switch annotated match
+t6011.scala:8: warning: could not emit switch for @switch annotated match
   def f2(ch: Char): Any = (ch: @annotation.switch) match {
                                 ^
-three errors found
+error: No warnings can be incurred under -Xfatal-warnings.
+three warnings found
+one error found