Add various tests for DFA testing

compiler/tests-spec/testData/diagnostics/helpers/annotations.kt

@@ -0,0 +1,3 @@
+@Retention(AnnotationRetention.SOURCE)
+@Target(AnnotationTarget.EXPRESSION)
+annotation class RetentionSourceAndTargetExpression

compiler/tests-spec/testData/diagnostics/helpers/classes.kt

@@ -5,12 +5,28 @@ class Class {
     val prop_4: Float? = 3f
     val prop_5: Float = 3f
     val prop_6: String = "..."
-    val prop_7: Nothing? = "..."
+    val prop_7: Nothing? = null
+    val prop_8: Class? = null
+    var prop_9: Boolean = true
+    val prop_10: Number? = 3f
+    val prop_11: Int = 10
+    var prop_12: String = ""
+    val prop_13: Any? = ""
+    val prop_14: Comparable<*>? = ""
+    val prop_15: Iterable<*>? = ""
 
     fun fun_1(): (Int) -> (Int) -> Int = {number: Int -> { number * 5 }}
     fun fun_2(value_1: Int): Int = value_1 * 2
     fun fun_3(value_1: Int): (Int) -> Int = fun(value_2: Int): Int = value_1 * value_2 * 2
+    fun fun_4(): Class? = Class()
 
+    operator fun get(i1: Int, i2: Int) = 10
+    operator fun set(i1: Int, i2: Int, el: Int) {}
+    operator fun get(i1: Int) = 10
+    operator fun set(i1: Int, el: Int) {}
+    operator fun invoke() {}
+    operator fun invoke(x) = { x: Any -> x }
+    operator fun invoke(x: Any, y: Any) {}
     operator fun contains(a: Int) = a > 30
     operator fun contains(a: Long) = a > 30L
     operator fun contains(a: Char) = a > 30.toChar()
@@ -19,12 +35,24 @@ class Class {
     fun getLongArray() = longArrayOf(1L, 2L, 3L, 4L, 5L)
     fun getCharArray() = charArrayOf(1.toChar(), 2.toChar(), 3.toChar(), 4.toChar(), 5.toChar())
 
-    class _NestedClass {
+    class NestedClass {
         val prop_4 = 4
         val prop_5 = 5
     }
 }
 
+operator fun Class?.inc(): Class? = null
+operator fun Class?.dec(): Class? = null
+operator fun Class?.plus(x: Class?): Class? = null
+operator fun Class?.minus(x: Class?): Class? = null
+
+open class ClassWithCustomEquals {
+    override fun equals(other: Any?) = true
+}
+
+open class ClassWithCostructorParam(val x: Any)
+open class ClassWithCostructorTwoParams(val x: Any, val y: Any)
+
 class EmptyClass {}
 
 class ClassWithCompanionObject {
@@ -37,6 +65,15 @@ open class ClassLevel1 {
 open class ClassLevel2: ClassLevel1() {
     fun test2() {}
 }
+open class ClassLevel21: ClassLevel1() {
+    fun test21() {}
+}
+open class ClassLevel22: ClassLevel1() {
+    fun test22() {}
+}
+open class ClassLevel23: ClassLevel1() {
+    fun test23() {}
+}
 open class ClassLevel3: ClassLevel2() {
     fun test3() {}
 }
@@ -51,6 +88,11 @@ class ClassLevel6: ClassLevel5() {
 }
 
 class Inv<T>(val x: T = null as T) {
+    val prop_1: Inv<T>? = null
+    val prop_2: T? = null
+    val prop_3: T = null
+    val prop_4 = 10
+
     fun test() {}
     fun get() = x
     fun put(x: T) {}
@@ -63,6 +105,9 @@ class In<in T>() {
 }
 
 class Out<out T>(val x: T = null as T) {
+    val prop_1: Inv<T>? = null
+    val prop_2: T? = null
+
     fun get() = x
 }
 
@@ -71,10 +116,17 @@ open class ClassWithTwoTypeParameters<K, L> {
     fun test2(): K? { return null }
 }
 
-class ClassWithThreeTypeParameters<K, L, M>(
+open class ClassWithThreeTypeParameters<K, L, M>(
     val x: K,
     val y: L,
     val z: M
 )
 
-class ClassWithSixTypeParameters<K, in L, out M, O, in P, out R>
+open class ClassWithSixTypeParameters<K, in L, out M, O, in P, out R>(
+    val u: R,
+    val x: K,
+    val y: M,
+    val z: O
+) {
+    fun test() = 10
+}

compiler/tests-spec/testData/diagnostics/helpers/enumClasses.kt

@@ -1,5 +1,7 @@
 enum class EnumClass {
-    NORTH, SOUTH, WEST, EAST
+    NORTH, SOUTH, WEST, EAST;
+
+    fun fun_1() {}
 }
 
 enum class EnumClassSingle {

compiler/tests-spec/testData/diagnostics/helpers/functions.kt

@@ -17,3 +17,12 @@ fun <K> expandInWithRemoveNullable(vararg x: In<K?>): K = x[0] as K
 fun <K> expandOutWithRemoveNullable(vararg x: Out<K?>): K = x[0] as K
 
 fun <K> removeNullable(vararg x: K?): K = x as K
+
+fun <T> T.funT() = 10
+fun <T> T?.funNullableT = 10
+
+fun Any.funAny() = 10
+fun Any?.funNullableAny = 10
+
+
+fun funNothingQuest() = null

compiler/tests-spec/testData/diagnostics/helpers/interfaces.kt

@@ -3,11 +3,21 @@ interface EmptyInterface
 interface Interface1 {
     fun itest() {}
     fun itest1() {}
+    fun itest0(): String
+    fun itest00(): Interface1
+    fun itest000(): Int?
+    fun itest0000(): Int
+    fun itest00000(): Int
 }
 
 interface Interface2 {
     fun itest() {}
     fun itest2() {}
+    fun itest0(): CharSequence
+    fun itest00(): Interface2
+    fun itest000(): Nothing?
+    fun itest0000(): Nothing
+    fun itest00000(): String
 }
 
 interface Interface3 {

compiler/tests-spec/testData/diagnostics/helpers/objects.kt

@@ -17,6 +17,7 @@ object DeepObject {
                             object G {
                                 object J {
                                     val x: Int? = 10
+                                    val prop_1: Int? = 10
                                 }
                             }
                         }

compiler/tests-spec/testData/diagnostics/helpers/properties.kt

@@ -14,3 +14,17 @@ val anonymousTypeProperty = object {}
 val nullableAnonymousTypeProperty = if (true) object {} else null
 
 val nullableOut: Out<Int>? = null
+
+val <T> T.propT get() = 10
+
+val <T : Any> T.propDefNotNullT get() = 10
+
+val <T> T?.propNullableT get(): Int? = 10
+
+val <T> T.propTT get() = 10 as T
+
+val <T> T?.propNullableTT get() = 10 as T?
+
+val Any.propAny get() = 10
+
+val Any?.propNullableAny get() = 10

compiler/tests-spec/testData/diagnostics/helpers/sealedClasses.kt

@@ -27,10 +27,12 @@ class SealedWithMethodsChild3() : SealedClassWithMethods() {
     fun m3() = this.hashCode().toString()
 }
 
-sealed class SealedClassMixed
+sealed class SealedClassMixed {
+    val prop_1: Int? = 10
+}
 data class SealedMixedChild1(val number: Int) : SealedClassMixed()
 data class SealedMixedChild2(val e1: Int, val e2: Int) : SealedClassMixed()
 data class SealedMixedChild3(val m1: Int, val m2: Int) : SealedClassMixed()
-object SealedMixedChildObject1 : SealedClassMixed()
+object SealedMixedChildObject1 : SealedClassMixed() { val prop_2: Int? = 10 }
 object SealedMixedChildObject2 : SealedClassMixed()
 object SealedMixedChildObject3 : SealedClassMixed()