Don't discard deprecation/unchecked warnings re...

Don't discard deprecation/unchecked warnings regardless of settings.

Changed warnings code to accumulate them rather than thoughtlessly
discarding them and issuing its well-known taunt. In the repl you can
take advantage of this with the :warnings command, which will show the
suppressed warnings from the last line which had any. Be advised that at
the moment it has some issues: unchecked warnings aren't making it out,
and near repl startup neither are deprecation warnings, so don't open a
bunch of tickets please.

References SI-4594, no review.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/compiler/scala/tools/nsc/interpreter/ILoop.scala b/src/compiler/scala/tools/nsc/interpreter/ILoop.scala
index 2ff8bb343f..457a34f9dc 100644
--- a/src/compiler/scala/tools/nsc/interpreter/ILoop.scala
+++ b/src/compiler/scala/tools/nsc/interpreter/ILoop.scala
@@ -225,7 +225,8 @@ class ILoop(in0: Option[BufferedReader], protected val out: JPrintWriter)
     nullary("replay", "reset execution and replay all previous commands", replay),
     shCommand,
     nullary("silent", "disable/enable automatic printing of results", verbosity),
-    cmd("type", "<expr>", "display the type of an expression without evaluating it", typeCommand)
+    cmd("type", "<expr>", "display the type of an expression without evaluating it", typeCommand),
+    nullary("warnings", "show the suppressed warnings from the most recent line which had any", warningsCommand)
   )
 
   /** Power user commands */
@@ -393,6 +394,9 @@ class ILoop(in0: Option[BufferedReader], protected val out: JPrintWriter)
       case _        => "" // the error message was already printed
     }
   }
+  private def warningsCommand(): Result = {
+    intp.lastWarnings foreach { case (pos, msg) => intp.reporter.warning(pos, msg) }
+  }
 
   private def javapCommand(line: String): Result = {
     if (javap == null)