Some work for string concatenation. (#40)

backend.native/tests/build.gradle

@@ -26,7 +26,7 @@ abstract class KonanTest extends DefaultTask {
 
 
     abstract void compileTest(File sourceS, File runtimeS, File out)
-    
+
     private  File kt2bc(String ktSource) {
         def sourceKt = project.file(ktSource)
         def sourceBc = new File("${sourceKt.absolutePath}.bc")
@@ -167,6 +167,13 @@ task hello1(type: RunKonanTest) {
     source = "runtime/basic/hello1.kt"
 }
 
+/* TODO: enable, once calling plus operator is implemented.
+task hello2(type: RunKonanTest) {
+    goldValue = "Hello World"
+    testData = "Hello World"
+    source = "runtime/basic/hello2.kt"
+} */
+
 // TODO: waiting for boolean to be implemented
 //task bool_yes(type: KonanTest) {
 //    source = "codegen/function/boolean.kt"

backend.native/tests/runtime/basic/hello2.kt

@@ -0,0 +1,4 @@
+// TODO: remove kotlin_native.io once overrides are in place.
+fun main(args : Array<String>) {
+  print("you entered '" + readLine() + "'")
+}