kotlin.Result as return type in functions vs function literals?

Hi,Its known that kotlin.Result can’t be used as return type for functions;

So fun parseNumber(s: String) = runCatching { s.toInt() } will not compile.

But what I find weird is that it can be used in function literals, as follow:

val parseNumber:(String)->Result<Int> = {n-> runCatching{n.toInt()}}

or

val parseCatchingFn: (String)->Result<Int> = fun(n) = runCatching{n.toInt()}

will compile correctly, why and what’s the difference?