1 files changed, 9 insertions, 0 deletions
diff --git a/src/compiler/scala/tools/nsc/util/package.scala b/src/compiler/scala/tools/nsc/util/package.scala
index 752aac5c8c..ea3c9d8dde 100644
--- a/src/compiler/scala/tools/nsc/util/package.scala
+++ b/src/compiler/scala/tools/nsc/util/package.scala
@@ -8,6 +8,7 @@ package tools
 package nsc
 
 import java.io.{ OutputStream, PrintStream, ByteArrayOutputStream, PrintWriter, StringWriter }
+import scala.compat.Platform.EOL
 
 package object util {
 
@@ -78,6 +79,14 @@ package object util {
     s"$clazz$msg @ $frame"
   }
 
+  def stackTracePrefixString(ex: Throwable)(p: StackTraceElement => Boolean): String = {
+    val frames = ex.getStackTrace takeWhile p map ("  at " + _)
+    val msg    = ex.getMessage match { case null => "" ; case s => s": $s" }
+    val clazz  = ex.getClass.getName
+
+    s"$clazz$msg" +: frames mkString EOL
+  }
+
   lazy val trace = new SimpleTracer(System.out)
 
   @deprecated("Moved to scala.reflect.internal.util.StringOps", "2.10.0")