Playing with Reflection API and property reference I tried something like this :

data class Point(val x:Int, val y:Int)

 val p = Point(5,13)

   val getter1 = Point::x
   val getter2: (Point) -> Int  = Point::x
 
    println(getter1(p)) // 5
    println(getter2(p)) // 5

What I don’t understand is why with getter1 I was able to get reflection information about x for example I could do something like :

println(getter1.visibility) // PUBLIC
   println(getter1.returnType) // <http://kotlin.Int|kotlin.Int>

while with getter2 I can’t, even if I use the

@OptIn(ExperimentalReflectionOnLambdas::class)

with

println(getter2.reflect()?.returnType)

the result is null.

The types of

getter1

and

getter2

are not the same. By specifying a wider type on

getter2

, you're losing the specificities of the more precise type of

Point::x

(

KProperty1<Point, Int>

). Using the actual

KProperty

type comes with extra information. A simple analogy would be

val getter3: Any = Point::x

- do you expect to be able to access

visibility

and

returnType

here?