Prohibit constructors declarations for object

compiler/testData/diagnostics/tests/secondaryConstructors/constructorInObject.kt

@@ -0,0 +1,20 @@
+object A {
+    <!SECONDARY_CONSTRUCTOR_IN_OBJECT!>constructor() {}<!>
+    init {}
+}
+
+enum class B {
+    X : B() {
+        <!SECONDARY_CONSTRUCTOR_IN_OBJECT!>constructor() {}<!>
+    }
+}
+
+class C {
+    default object {
+        <!SECONDARY_CONSTRUCTOR_IN_OBJECT!>constructor() {}<!>
+    }
+}
+
+val anonObject = object {
+    <!SECONDARY_CONSTRUCTOR_IN_OBJECT!>constructor() {}<!>
+}

compiler/testData/diagnostics/tests/secondaryConstructors/constructorInObject.txt

@@ -0,0 +1,48 @@
+package
+
+internal val anonObject: kotlin.Any
+
+internal object A {
+    private constructor A()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+internal final enum class B : kotlin.Enum<B> {
+    public enum entry X : B {
+        private constructor X()
+        public final override /*1*/ /*fake_override*/ fun compareTo(/*0*/ other: B): 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
+    }
+
+    private constructor B()
+    public final override /*1*/ /*fake_override*/ fun compareTo(/*0*/ other: B): 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): B
+    public final /*synthesized*/ fun values(): kotlin.Array<B>
+}
+
+internal final class C {
+    public constructor C()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    internal default object Default {
+        private constructor Default()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}