Non-exhaustive 'when' statements will be prohibited since 1.7
Reports a non-exhaustive when
statements that will lead to compilation error since 1.7.
Motivation types:
Problematic/meaningless usage patterns need to be discouraged/blocked (e.g. counterintuitive behaviors)
Code is error-prone
Inconsistency in the design (things are done differently in different contexts)
Impact types:
Compilation. Some code that used to compile won't compile any more
There were cases when such code worked with no exceptions
Some such code could compile without any warnings
More details: KT-47709: Make when statements with enum, sealed, and Boolean subjects exhaustive by default
The quick-fix adds the missing else -> {}
branch.
Example:
sealed class Base {
class A : Base()
class B : Base()
}
fun test(base: Base) {
when (base) {
is Base.A -> ""
}
}
After the quick-fix is applied:
sealed class Base {
class A : Base()
class B : Base()
}
fun test(base: Base) {
when (base) {
is Base.A -> ""
else -> {}
}
}
- By ID
Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.
NonExhaustiveWhenStatementMigration
This inspection only reports if the Kotlin language level of the project or module is 1.6 or higher.
Inspection Details | |
---|---|
By default bundled with: | |
Can be installed with plugin: | Kotlin, 243.23126-IJ |
Thanks for your feedback!