Issue with sealed classes and when

Support
1

https://pl.kotl.in/yq8pbWPns

I’m wondering why it is work.
I didn’t provide when branch for ‘Unknown’ class and expect compile error but there no error at all. Compiled and running.

What is missing? Looks like I don’t understand how it should work but documentation said:

The key benefit of using sealed classes comes into play when you use them in a when expression. If it’s possible to verify that the statement covers all cases, you don’t need to add an else clause to the statement.

2

There is no when expression in your code.

Expression:

val a = when(...) { ... }

Statement:

when(...) { ... }
1 Like
3

Ok, thanks - got it.

This is too easy to miss … dangerous one.