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.
36 lines
648 B
Kotlin
Vendored
36 lines
648 B
Kotlin
Vendored
// !DIAGNOSTICS: -UNUSED_EXPRESSION,-UNUSED_VARIABLE
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fun <T : CharSequence?> T.bar1() {}
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fun CharSequence?.bar2() {}
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fun <T : CharSequence> T.bar3() {}
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fun CharSequence.bar4() {}
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fun <T : String?> T.foo() {
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if (this != null) {
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if (<!SENSELESS_COMPARISON!>this != null<!>) {}
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length
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this<!UNNECESSARY_SAFE_CALL!>?.<!>length
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bar1()
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bar2()
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bar3()
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bar4()
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this<!UNNECESSARY_SAFE_CALL!>?.<!>bar1()
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}
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<!UNSAFE_CALL!>length<!>
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if (this is String) {
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length
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this<!UNNECESSARY_SAFE_CALL!>?.<!>length
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bar1()
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bar2()
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bar3()
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}
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}
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