FIR checker: SENSELESS_(COMPARISON|NULL_IN_WHEN)

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.

This commit is contained in:

Tianyu Geng

2021-07-20 09:46:18 -07:00

committed by

teamcityserver

parent 4726dcce40

commit c7272f6986

108 changed files with 1410 additions and 1485 deletions

									
										compiler/testData/diagnostics/tests/syntheticExtensions/javaProperties/KotlinOverridesJava5.kt
									
Vendored

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				@@ -1,3 +1,4 @@

				// FIR_IDENTICAL

				// FILE: KotlinFile.kt

				abstract class KotlinClass : JavaInterface3 {

				    override fun getSomething(): String = ""