Print error message in case of errors

Author: lolgab

core/loop.scala

@@ -44,7 +44,15 @@ object EventLoop extends ExecutionContextExecutor {
   // Schedule loop execution after main ends
   scalanative.runtime.ExecutionContext.global.execute(
     new Runnable {
-      def run(): Unit = EventLoop.run()
+      def run(): Unit = {
+        val returnCode = EventLoop.run()
+        if(returnCode != 0) {
+          Zone { implicit z =>
+            System.err.println(fromCString(uv_err_name(returnCode)))
+          }
+          System.exit(returnCode)
+        }
+      }
     }
   )
 
@@ -57,11 +65,12 @@ object EventLoop extends ExecutionContextExecutor {
     t.printStackTrace()
   }
 
-  def run(mode:Int = UV_RUN_DEFAULT):Unit = {
+  def run(mode:Int = UV_RUN_DEFAULT):Int = {
     var continue = 1
     while (continue != 0) {
         continue = uv_run(loop, mode)
     }
+    continue
   }
 }
 

project/build.properties

@@ -1 +1 @@
-sbt.version=1.3.4
+sbt.version=1.3.4

project/plugins.sbt

@@ -1,3 +1,3 @@
 addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.0-M2")
 addSbtPlugin("com.jsuereth" % "sbt-pgp" % "2.0.0")
-addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "3.8.1")
+addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "3.8.1")