Haven't anyone created a ticket at https://youtrack.jetbrains.com/issues/KT to allow to extract lambda outside the constructor parameters? It will be great to have such a feature for kotest: instead of

class MyTest : FreeSpec({
    // ...
})

it will be possible to write like

class MyTest : FreeSpec {
    // ...
}

The test Lambda is a parameter to the constructor, hence the syntax. The only alternative is to use the

init

syntax, but personally, I think that's even less desirable.

@Mike, yep, I want to use the constructor syntax, but without round brackets

Question. How will the compiler differentiate between constructor and class definition without the parenthesis? And how much impact will it have on performance if it can? Still never hurts to ask.

How will the compiler differentiate between constructor and class definition without the parenthesis?

Just proposed the behavior in the ticket, thanks

This would be amazing