Why isn't this a valid contract? It says "Only references to parameters are allowed in a contract de...

# announcements

[Paul Woitaschek]

Why isn't this a valid contract? It says "Only references to parameters are allowed in a contract description". What does that mean?

Untitled.kt

[hho]

It means, you can't reference a property (value in this case) in a contract. Only parameters of the method (but yours doesn't have any).

Like this maybe? (untested)

@ExperimentalContracts
fun isValidEmail(value: String?): Boolean {
	contract {
		returns(true) implies (value != null)
	}
	return value != null && mailRegex.matches(value)
}

[Paul Woitaschek]

Ah damn, this whould have been to good

[hho]

Hm. I just tried it with one indirection, but the compiler doesn't check it two levels deep 🙍‍♂️ :

[Stephan Schroeder]

hmm, but this is an inline class .. . doesn't that mean value is this?!?