Enum entries now can have no initializer if default secondary constructor is available. #KT-8484 Fixed

compiler/testData/diagnostics/tests/enum/emptyConstructor.kt

@@ -0,0 +1,4 @@
+enum class E {
+    A; // no constructor call needed
+    constructor()
+}

compiler/testData/diagnostics/tests/enum/emptyConstructor.txt

@@ -0,0 +1,18 @@
+package
+
+internal final enum class E : kotlin.Enum<E> {
+    enum entry A
+
+    private constructor E()
+    protected final override /*1*/ /*fake_override*/ fun clone(): kotlin.Any
+    public final override /*1*/ /*fake_override*/ fun compareTo(/*0*/ other: E): kotlin.Int
+    public final override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public final override /*1*/ /*fake_override*/ fun name(): kotlin.String
+    public final override /*1*/ /*fake_override*/ fun ordinal(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    // Static members
+    public final /*synthesized*/ fun valueOf(/*0*/ value: kotlin.String): E
+    public final /*synthesized*/ fun values(): kotlin.Array<E>
+}

compiler/testData/diagnostics/tests/enum/multipleConstructors.kt

@@ -0,0 +1,8 @@
+enum class E(val x: Int, val y: Int) {
+    A(1, 2),
+    B(1),
+    C; // no constructor call needed even here
+
+    constructor(): this(0, 0)
+    constructor(x: Int): this(x, 0)
+}

compiler/testData/diagnostics/tests/enum/multipleConstructors.txt

@@ -0,0 +1,26 @@
+package
+
+internal final enum class E : kotlin.Enum<E> {
+    enum entry A
+
+    enum entry B
+
+    enum entry C
+
+    private constructor E()
+    private constructor E(/*0*/ x: kotlin.Int)
+    private constructor E(/*0*/ x: kotlin.Int, /*1*/ y: kotlin.Int)
+    internal final val x: kotlin.Int
+    internal final val y: kotlin.Int
+    protected final override /*1*/ /*fake_override*/ fun clone(): kotlin.Any
+    public final override /*1*/ /*fake_override*/ fun compareTo(/*0*/ other: E): kotlin.Int
+    public final override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public final override /*1*/ /*fake_override*/ fun name(): kotlin.String
+    public final override /*1*/ /*fake_override*/ fun ordinal(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    // Static members
+    public final /*synthesized*/ fun valueOf(/*0*/ value: kotlin.String): E
+    public final /*synthesized*/ fun values(): kotlin.Array<E>
+}