I'm unable to add two `BigInteger` s, both when I ...

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[Marcin Wisniowski]

I'm unable to add two BigInteger s, both when I use + and plus() . I get a compiler error about overload ambiguity: <https://ss.nohus.eu/14331/03576c27>
How to fix this error?
This does not compile:

fun main() {
    BigInteger.ONE + BigInteger.ONE
}

[Matthieu Esnault]

Where did you define your extension for the plus operator of BigInteger?

You might have two definitions of it

[Marcin Wisniowski]

I haven't, there is one by default in Kotlin (in BigIntegers.kt)

[Matthieu Esnault]

Oh, I didn’t know it was defined there, my bad.
If you try to navigate to the source of the + sign, does it lead to two methods?

[Marcin Wisniowski]

It leads to one, not sure how to find the second one, it seems the error points twice to the same one.

[bezrukov]

try to
1. optimize imports (ctrl + alt + o)
2. type BigInteger.ONE.plus and look on autocomplete

[Marcin Wisniowski]

import java.math.BigInteger

fun main() {
    BigInteger.ONE.plus(BigInteger.ONE)
}

Same error, this is the entire file. Does it compile for other people? Any other ideas?

[Matthieu Esnault]

Works fine on my machine

~ > kotlinc-jvm
Welcome to Kotlin version 1.3.61 (JRE 1.8.0_141-b15)
Type :help for help, :quit for quit
>>> import java.math.BigInteger
>>> BigInteger.ONE.plus(BigInteger.ONE)
res1: java.math.BigInteger = 2

[tseisel]

This might be due to having multiple version of the Kotlin Stdlib in the classpath, hence the duplicate extension.