A utility function to summarize an exception.

Now when I start the repl and trigger an exception during
initialization, it offers a one line message like:

  uncaught exception during compilation:
    AssertionError("assertion failed: (14,13)")
    @ scala.reflect.internal.Symbols$Symbol.updateInfo(Symbols.scala:1309)

Which is a marked debugging improvement from RC1:

  uncaught exception during compilation: java.lang.AssertionError

1 files changed, 2 insertions, 2 deletions

diff --git a/src/compiler/scala/tools/nsc/Global.scala b/src/compiler/scala/tools/nsc/Global.scala
index f0984c2ebc..552146b9d4 100644
--- a/src/compiler/scala/tools/nsc/Global.scala
+++ b/src/compiler/scala/tools/nsc/Global.scala
@@ -1525,8 +1525,8 @@ class Global(var currentSettings: Settings, var reporter: Reporter)
         val shown = if (settings.verbose.value)
            stackTraceString(ex)
          else
-           ex.getClass.getName
-        // ex.printStackTrace(Console.out) // DEBUG for fsc, note that error stacktraces do not print in fsc
+           stackTraceHeadString(ex) // note that error stacktraces do not print in fsc
+
         globalError(supplementErrorMessage("uncaught exception during compilation: " + shown))
         throw ex
       }