unary operator on -9223372036854775808 does not invert

[Le0Developer]

V doctor:

V full version: V 0.4.8 602b097.94ce64c
OS: macos, macOS, 15.1.1, 24B2091
Processor: 10 cpus, 64bit, little endian, Apple M4

getwd: /Users/leodev/p/v/fast2
vexe: /Users/leodev/p/v/v/v
vexe mtime: 2024-12-01 10:31:00

vroot: OK, value: /Users/leodev/p/v/v
VMODULES: OK, value: /Users/leodev/.vmodules
VTMP: OK, value: /tmp/v_501

Git version: git version 2.47.0
Git vroot status: weekly.2024.48-35-g94ce64c6 (2 commit(s) behind V master)
.git/config present: true

CC version: Apple clang version 16.0.0 (clang-1600.0.26.4)
emcc version: N/A
thirdparty/tcc status: thirdparty-macos-arm64 713692d4

What did you do?
./v -g -o vdbg cmd/v && ./vdbg repro.v

fn main() {
    x := i64(-9223372036854775808)
    dump(x)
    dump(-x)
}

What did you expect to see?

2nd number should be positive

What did you see instead?

[repro.v:3] x: -9223372036854775808
[repro.v:4] -x: -9223372036854775808

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_{Huly®: V_0.6-21476}

[Delta456]

I am not sure if this is an issue because Go also outputs the same

Playground Link: https://go.dev/play/p/J5OPWGybdCF

[Le0Developer]

I only just realized this is Int64 max + 1. So there indeed is no real solution for this, but its still very unintuitive.

I stumbled upon this because somehow this value made it into a time.Duration and the time.Duration.str() output --808ns (note the double -)