// !DIAGNOSTICS: -UNUSED_EXPRESSION -UNUSED_VARIABLE -UNUSED_VALUE
// SKIP_TXT

/*
 * KOTLIN DIAGNOSTICS NOT LINKED SPEC TEST (NEGATIVE)
 *
 * SECTIONS: dfa
 * NUMBER: 25
 * DESCRIPTION: Raw data flow analysis test
 * HELPERS: classes, objects, typealiases, functions, enumClasses, interfaces, sealedClasses
 */

// TESTCASE NUMBER: 1, 2
class ClassWithEqualsOverride {
    override fun equals(other: Any?) = true
    fun fun_1() = true
}

/*
 * TESTCASE NUMBER: 1
 * UNEXPECTED BEHAVIOUR
 * ISSUES: KT-28239
 */
fun case_1() {
    val x: ClassWithEqualsOverride? = null
    val y = ClassWithEqualsOverride()
    if (y == x) {
        <!DEBUG_INFO_EXPRESSION_TYPE("ClassWithEqualsOverride & ClassWithEqualsOverride?")!>x<!>
        <!DEBUG_INFO_EXPRESSION_TYPE("ClassWithEqualsOverride & ClassWithEqualsOverride?"), DEBUG_INFO_SMARTCAST!>x<!>.fun_1()
    }
}

/*
 * TESTCASE NUMBER: 2
 * UNEXPECTED BEHAVIOUR
 * ISSUES: KT-28239
 */
fun case_2() {
    val x: ClassWithEqualsOverride? = null
    val y: ClassWithEqualsOverride? = ClassWithEqualsOverride()
    if (y != null) {
        if (y == x) {
            <!DEBUG_INFO_EXPRESSION_TYPE("ClassWithEqualsOverride & ClassWithEqualsOverride?")!>x<!>
            <!DEBUG_INFO_EXPRESSION_TYPE("ClassWithEqualsOverride & ClassWithEqualsOverride?"), DEBUG_INFO_SMARTCAST!>x<!>.fun_1()
        }
    }
}

/*
 * TESTCASE NUMBER: 3
 * UNEXPECTED BEHAVIOUR
 * ISSUES: KT-28239
 */
fun case_3() {
    val x: ClassWithEqualsOverride? = null
    val y: ClassWithEqualsOverride? = ClassWithEqualsOverride()
    if (y!! == x) {
        <!DEBUG_INFO_EXPRESSION_TYPE("ClassWithEqualsOverride & ClassWithEqualsOverride?")!>x<!>
        <!DEBUG_INFO_EXPRESSION_TYPE("ClassWithEqualsOverride & ClassWithEqualsOverride?"), DEBUG_INFO_SMARTCAST!>x<!>.fun_1()
    }
}