I discovered a difference between Kotlin/JVM and K...

# kotlin-native

[roamingthings]

I discovered a difference between Kotlin/JVM and Kotlin/Native (on Raspberry Pi) behaviour and I’m not sure if I’m misusing also() to swap two values here or if this is bug.

Given the following code:

fun main(args: Array<String>) {
    var x0 = 25
    var y0 = 26

    var x1 = 27
    var y1 = 28
    
    x0 = y0.also { y0 = x0 }
    x1 = y1.also { y1 = x1 }

    println("x0=$x0, y0=$y0, x1=$x1, y1=$y1")
}

Kotlin/JVM will produce the following output (x0 <-> y0 and x1 <-> y1):

x0=26, y0=25, x1=28, y1=27

Whereas Kotlin/Native does the following:

x0=25, y0=25, x1=27, y1=27

Any thoughts?

[louiscad]

The inconsistent behavior is interesting, so I'm notifying @olonho , but this is a mind twisting way to swap two variables!

[roamingthings]

it is and I don’t like it. But still thought that the difference would be important to mention

[olonho]

we cannot reproduce it on current compiler builds, which version do you use? also please use github issue tracker or https://youtrack.jetbrains.com/issues/KT

[roamingthings]

I’m using 0.4 and will try to create a project reproducing this behaviour. I will then use GitHub if the issue persists.

[olonho]

Please try with 0.5

[roamingthings]

I will

[tfire]

This problem has been fixed in Kotlin Native 0.5.