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.
26 lines
579 B
Kotlin
Vendored
26 lines
579 B
Kotlin
Vendored
// FILE: KotlinFile.kt
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abstract class KotlinClass : JavaInterface1, JavaInterface2 {
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override fun getSomething(): String = ""
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}
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fun foo(k: KotlinClass) {
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useString(k.getSomething())
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useString(k.something)
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if (<!SENSELESS_COMPARISON!>k.something == null<!>) return
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k.setSomething(1)
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k.something = <!ASSIGNMENT_TYPE_MISMATCH!>1<!>
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}
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fun useString(i: String) {}
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// FILE: JavaInterface1.java
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public interface JavaInterface1 {
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String getSomething();
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}
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// FILE: JavaInterface2.java
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public interface JavaInterface2 {
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void setSomething(int value);
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}
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