Report errors in JS source maps as compiler warnings

js/js.tests/test/org/jetbrains/kotlin/js/test/AbstractJsLineNumberTest.kt

@@ -35,6 +35,7 @@ import org.jetbrains.kotlin.js.facade.K2JSTranslator
 import org.jetbrains.kotlin.js.facade.MainCallParameters
 import org.jetbrains.kotlin.js.facade.TranslationResult
 import org.jetbrains.kotlin.js.facade.TranslationUnit
+import org.jetbrains.kotlin.js.test.utils.ExceptionThrowingReporter
 import org.jetbrains.kotlin.js.test.utils.LineCollector
 import org.jetbrains.kotlin.js.test.utils.LineOutputToStringVisitor
 import org.jetbrains.kotlin.js.util.TextOutputImpl
@@ -69,7 +70,7 @@ abstract class AbstractJsLineNumberTest : KotlinTestWithEnvironment() {
 
                 val translator = K2JSTranslator(createConfig(module, file, modules))
                 val units = module.files.map { TranslationUnit.SourceFile(createPsiFile(it.fileName)) }
-                val translationResult = translator.translateUnits(units, MainCallParameters.noCall())
+                val translationResult = translator.translateUnits(ExceptionThrowingReporter, units, MainCallParameters.noCall())
 
                 if (translationResult !is TranslationResult.Success) {
                     val outputStream = ByteArrayOutputStream()

js/js.tests/test/org/jetbrains/kotlin/js/test/BasicBoxTest.kt

@@ -331,7 +331,7 @@ abstract class BasicBoxTest(
             outputPostfixFile: File?,
             mainCallParameters: MainCallParameters) {
         val translator = K2JSTranslator(config)
-        val translationResult = translator.translateUnits(units, mainCallParameters)
+        val translationResult = translator.translateUnits(ExceptionThrowingReporter, units, mainCallParameters)
 
         if (translationResult !is TranslationResult.Success) {
             val outputStream = ByteArrayOutputStream()

js/js.tests/test/org/jetbrains/kotlin/js/test/utils/ExceptionThrowingReporter.kt

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2010-2017 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.js.test.utils
+
+import org.jetbrains.kotlin.js.config.JsConfig
+
+object ExceptionThrowingReporter : JsConfig.Reporter() {
+    override fun error(message: String) {
+        throw AssertionError("Error message reported: $message")
+    }
+}