Tianyu Geng
c7272f6986
Currently DFA does not set "definitely equal to null" for access to variables that got assigned `null`. For example, FIR should mark the following line as SENSELESS_COMPARISON due to `s = null` above. https://github.com/JetBrains/kotlin/blob/d1531f9cdd5852352c0133198706125dc63b6007/compiler/testData/diagnostics/tests/smartCasts/alwaysNull.fir.kt#L6 The problem is at https://github.com/JetBrains/kotlin/blob/7e9f27436a77de1c76e3705da7aa1fbe8938336b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/dfa/FirDataFlowAnalyzer.kt#L1104 For null assignment, ideally the type should be `Nothing?`. This is addressed in a followup commit instead.
106 lines
2.4 KiB
Kotlin
Vendored
106 lines
2.4 KiB
Kotlin
Vendored
// !LANGUAGE: +NewInference
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// !DIAGNOSTICS: -UNUSED_EXPRESSION -UNUSED_VARIABLE -UNUSED_VALUE
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// SKIP_TXT
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/*
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* TESTCASE NUMBER: 1
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* UNEXPECTED BEHAVIOUR
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* ISSUES: KT-28759
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*/
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fun case_1() {
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val x: Int? = 10
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val y: Int?
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y = x
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if (y != null) {
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<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int? & kotlin.Int")!>x<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int? & kotlin.Int")!>x<!>.inv()
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}
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}
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/*
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* TESTCASE NUMBER: 2
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* UNEXPECTED BEHAVIOUR
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* ISSUES: KT-28759
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*/
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fun case_2() {
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val x: Int? = 10
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val y: Int?
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y = x
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y!!
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<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int? & kotlin.Int")!>x<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int? & kotlin.Int")!>x<!>.inv()
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}
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/*
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* TESTCASE NUMBER: 3
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* UNEXPECTED BEHAVIOUR
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* ISSUES: KT-28759
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*/
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fun case_3() {
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var x: Int? = 10
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val y: Int?
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y = x
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y!!
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<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int? & kotlin.Int")!>x<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int? & kotlin.Int")!>x<!>.inv()
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}
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/*
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* TESTCASE NUMBER: 4
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* UNEXPECTED BEHAVIOUR
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* ISSUES: KT-28759
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*/
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fun case_4() {
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val x: Int? = 10
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var y: Int?
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y = x
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if (y != null) {
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<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int? & kotlin.Int")!>x<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int? & kotlin.Int")!>x<!>.inv()
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}
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}
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// TESTCASE NUMBER: 5
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fun case_5() {
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val x: Int?
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val y: Int?
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x = 10;y = x
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if (<!SENSELESS_COMPARISON!>y != null<!>) {
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<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int? & kotlin.Int")!>x<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int? & kotlin.Int")!>x<!>.inv()
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}
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}
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// TESTCASE NUMBER: 6
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fun case_6() {
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var x: Int?
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val y: Int?
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x = 10;y = x
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if (<!SENSELESS_COMPARISON!>y != null<!>) {
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<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int? & kotlin.Int")!>x<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int? & kotlin.Int")!>x<!>.inv()
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}
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}
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// TESTCASE NUMBER: 7
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fun case_7() {
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val x: Int?
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var y: Int?
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x = 10;y = x
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if (<!SENSELESS_COMPARISON!>y != null<!>) {
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<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int? & kotlin.Int")!>x<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int? & kotlin.Int")!>x<!>.inv()
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}
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}
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// TESTCASE NUMBER: 8
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fun case_8() {
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var x: Int?
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var y: Int?
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x = 10;y = x
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if (<!SENSELESS_COMPARISON!>y != null<!>) {
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<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int? & kotlin.Int")!>x<!>
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<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int? & kotlin.Int")!>x<!>.inv()
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}
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}
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