Temporary local variable dropped after popenv?

[Siuhnexus]

Incorrect output observed

The following bytecode threw an error, and since I didn't find anything in the Issues for the compiler I suspect something went wrong while decompiling:

> gml_Script_TwFindById (locals=0, argc=1)
:[1551]
pushref.i 100
pushi.e -9
pushenv [1554]

:[1552]
push.v builtin.N
push.v arg.argument0
cmp.v.v EQ
bf [1554]

:[1553]
push.v builtin.id
pop.v.v local.$$$$temp$$$$
popenv <drop>
push.v local.$$$$temp$$$$
ret.v

The error thrown:

Variable <unknown_object>.$$$$temp$$$$(100080, -2147483648) not set before reading it.
at gml_Script_TwFindById

Could it be that local.$$$$temp$$$$ is dropped after popenv and that's why it's not set in the outer context?

Expected output

I have no clue

VM assembly

Additional context
The decompiled code is this:

function TwFindById(argument0)
{
    with (tower)
    {
        if (N == argument0)
            return id;
    }
    
    return -1;
}

[colinator27]

This seems pretty peculiar... The decompilation looks correct, so it's possible that this is a compiler bug, but there's not quite enough information to figure out what went wrong. (It may even be a different part of the code?)

Did you use UndertaleModTool to re-compile the code? If so, what version? I just opened a PR for the new Underanalyzer compiler here, but I'm not sure if you're using that version or not: UnderminersTeam/UndertaleModTool#2056.

[Siuhnexus]

I am sorry, I tested this with the underanalyzer branch and not with the underanalyzer-compiler branch. Switching solved all my problems. Thank you so much for your awesome work.