How to show toString() at IntelliJ debug of kotlin.time.Duration

Question

I am trying to debug my Kotlin code in IntelliJ IDEA. When I use a kotlin.time.Duration object and print it using println, I get the expected output in the console ("1h"). However, when I check the variable in the debugger, it shows a long value (7200000000000).

Here's an example:

val test: Duration = 1.hours
println(test) //Consol out = "1h"

Debugger shows:

test: long = 7200000000000

Is there a way to make the debugger display the toString() representation of the Duration object, similar to what println shows?

Answer 1

This has been reported as a bug - IDEA-335220.

This happens because Duration is a value class that wraps a Long. The debugger shows the inlined Long, instead of using the value class's toString implementation.

For now, you can evaluate the variable using the "Evaluate Expression" box. The result of toString will show up there.