Set failOnError = true by default in kotlinc Ant task as in javac

#KT-8742 Fixed

ant/src/org/jetbrains/kotlin/ant/KotlinCompilerBaseTask.kt

@@ -34,7 +34,7 @@ public abstract class KotlinCompilerBaseTask : Task() {
     public var nowarn: Boolean = false
     public var verbose: Boolean = false
     public var printVersion: Boolean = false
-    public var failOnError: Boolean = false
+    public var failOnError: Boolean = true
 
     public var noStdlib: Boolean = false
 

compiler/testData/integration/ant/jvm/failOnErrorByDefault/build.log.expected

@@ -0,0 +1,20 @@
+OUT:
+Buildfile: [TestData]/build.xml
+
+build:
+  [kotlinc] Compiling [[TestData]] => [[Temp]]
+  [kotlinc] [TestData]/incorrectKotlinCode.kt:1:5: error: expecting a top level declaration
+  [kotlinc] xxxx
+  [kotlinc]     ^
+  [kotlinc] [TestData]/incorrectKotlinCode.kt:1:1: error: unresolved reference: xxxx
+  [kotlinc] xxxx
+  [kotlinc] ^
+
+ERR:
+
+BUILD FAILED
+[TestData]/build.xml:5: Compile failed; see the compiler error output for details.
+
+Total time: [time]
+
+Return code: 1

compiler/testData/integration/ant/jvm/failOnErrorByDefault/build.xml

@@ -0,0 +1,7 @@
+<project name="Ant Task Test" default="build">
+    <taskdef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="${kotlin.lib}/kotlin-ant.jar"/>
+
+    <target name="build">
+        <kotlinc src="${test.data}" output="${temp}"/>
+    </target>
+</project>

compiler/testData/integration/ant/jvm/failOnErrorByDefault/incorrectKotlinCode.kt

@@ -0,0 +1 @@
+xxxx

compiler/tests/org/jetbrains/kotlin/integration/AntTaskTestGenerated.java

@@ -47,6 +47,12 @@ public class AntTaskTestGenerated extends AbstractAntTaskTest {
         doTest(fileName);
     }
 
+    @TestMetadata("failOnErrorByDefault")
+    public void testFailOnErrorByDefault() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("compiler/testData/integration/ant/jvm/failOnErrorByDefault/");
+        doTest(fileName);
+    }
+
     @TestMetadata("helloWorld")
     public void testHelloWorld() throws Exception {
         String fileName = JetTestUtils.navigationMetadata("compiler/testData/integration/ant/jvm/helloWorld/");