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kotlinnumber-literal

Why the literal "-9223372036854775808" (min 64 bit signed integer) is not accepted by kotlin?

I'm trying to write a fast json parser for JVM in kotlin.

And I found this issue, I'm not sure this is a bug or any good reason behind this.

val x: Long = -9223372036854775808L  // compile error
Solution

  • this is marked as a bug in kotlin KT-17172.

    as you can see the stdlib using the code as below:

    public const val MIN_VALUE: Long = -9223372036854775807L - 1L

    are you remember unary operator - in kotlin? if you divide the MIN_VALUE into special parts you may see it clearly. for example:

    val x: Long = -(9223372036854775808L);
//              ^--- the value overflow since the MAX_VALUE is 9223372036854775807L