JS: move expressions test to box tests

js/js.translator/testData/box/expression/misc/KT-2314.kt

@@ -0,0 +1,25 @@
+package foo
+
+import java.util.*
+
+fun box(): String {
+    val data = myArrayList("foo", "bar")
+    if (data.myHead != "foo") {
+        return "fail: ${data.myHead}"
+    }
+    return "OK"
+}
+
+
+inline public fun <T> myArrayList(vararg values: T): ArrayList<T> {
+    val c = ArrayList<T>()
+    for (v in values) {
+        c.add(v)
+    }
+    return c
+}
+
+public val <T> ArrayList<T>.myHead: T
+    get() {
+        return get(0)
+    }