added more 'abstract' modifier checks; added 'ClassModifiers'

idea/testData/checker/Abstract.jet

@@ -47,4 +47,22 @@ abstract class <error>A10</error> {
 <error>abstract</error> val i: Int
 <error>abstract</error> fun foo(): fun(Int): Int
 val <error>j</error>: Int
-fun <error>foo1</error>(): fun(Int): Int
+fun <error>foo1</error>(): fun(Int): Int
+
+//creating an instance
+abstract class B1(
+    val i: Int,
+    val s: String
+) {
+}
+
+class B2() : B1(1, "r") {}
+
+abstract class B3(i: Int) {
+    this(): this(1)
+}
+
+fun foo(a: B3) {
+    val a = <error>B3()</error>
+    val b = <error>B1(2, "s")</error>
+}

idea/testData/checker/BinaryCallsOnNullableValues.jet

@@ -1,13 +1,13 @@
-abstract class A() {
-  abstract fun equals(a : Any?) : Boolean
+class A() {
+  fun equals(a : Any?) : Boolean = false
 }
 
-abstract class B() {
-  abstract fun equals(a : Any?) : Boolean?
+class B() {
+  fun equals(a : Any?) : Boolean? = false
 }
 
-abstract class C() {
-  abstract fun equals(a : Any?) : Int
+class C() {
+  fun equals(a : Any?) : Int = 0
 }
 
 fun f(): Unit {

idea/testData/checker/ExtensionFunctions.jet

@@ -40,9 +40,9 @@ fun Int.foo() = this
 namespace null_safety {
 
         fun parse(cmd: String): Command? { return null  }
-        abstract class Command() {
+        class Command() {
         //  fun equals(other : Any?) : Boolean
-          abstract val foo : Int
+          val foo : Int = 0
         }
 
         fun Any.equals(other : Any?) : Boolean = true

idea/testData/checker/ForRangeConventions.jet

@@ -65,16 +65,16 @@ abstract class Range1() {
   abstract fun iterator() : Iterator<Int>
 }
 
-fun test() {
-  for (i in <error>NotRange1()</error>);
-  for (i in <error>NotRange2()</error>);
-  for (i in <error>NotRange3()</error>);
-  for (i in <error>NotRange4()</error>);
-  for (i in <error>NotRange5()</error>);
-  for (i in <error>NotRange6()</error>);
-  for (i in <error>NotRange7()</error>);
-  for (i in Range0());
-  for (i in Range1());
+fun test(notRange1: NotRange1, notRange2: NotRange2, notRange3: NotRange3, notRange4: NotRange4, notRange5: NotRange5, notRange6: NotRange6, notRange7: NotRange7, range0: Range0, range1: Range1) {
+  for (i in <error>notRange1</error>);
+  for (i in <error>notRange2</error>);
+  for (i in <error>notRange3</error>);
+  for (i in <error>notRange4</error>);
+  for (i in <error>notRange5</error>);
+  for (i in <error>notRange6</error>);
+  for (i in <error>notRange7</error>);
+  for (i in range0);
+  for (i in range1);
 
   for (i in (ArrayList<Int>() : List<Int>));
 }