Num.powInt overflow behavior

[KilianVounckx]

When Num.powInt overflows, it doesn't panic, but silently returns 0.

To replicate, enter Num.powInt (Num.toU8 2) 8 in the repl.

[lukewilliamboswell]

@KilianVounckx can you please check if this is reproducible using the llvm backend. You can copy this into an basic-cli app and run using --optimize. Also can you please confirm which operating system and architecture you experienced this on.

I get the same behaviour on my apple silicon Mac using the repl.

» Num.powInt 2u8 8

0 : U8

I suspect this is related to the dev backend.

[KilianVounckx]

@lukewilliamboswell I wrote this sample program:

app [main] {
    cli: platform "https://github.com/roc-lang/basic-cli/releases/download/0.15.0/SlwdbJ-3GR7uBWQo6zlmYWNYOxnvo8r6YABXD-45UOw.tar.br",
}

import cli.Stdout

main : Task {} _
main =
    x : U8
    x = 2
    y = Num.powInt x 8
    Stdout.line! (Num.toStr y)

I again get an output of 0 when building with --optimize and then running the executable.

I am using Pop-OS! on an x86_64 machine