building GUI example results in "XdgRuntimeDirNotSet" error

[nick-gravgaard]

I've just installed the latest Ubuntu on a VirtualBox host, and used shared folders to copy across the latest nightly build archive of roc and my recently cloned roc repo.

Building the repo's examples/gui/Hello.roc using the roc binary from the archive file results in an error.

nick@nick-VirtualBox:~/Downloads/roc_nightly-linux_x86_64-2022-09-28-11ef947$ ./roc ~/repos/roc/examples/gui/Hello.roc
🔨 Rebuilding platform...
thread 'main' panicked at 'Failed to initialize any backend! Wayland status: XdgRuntimeDirNotSet X11 status: XOpenDisplayFailed', /home/nick/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.26.1/src/platform_impl/linux/mod.rs:619:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Segmentation fault (core dumped)

This does however create a hello-gui file which successfully opens a window when run. When I close that window I get a Segmentation fault (core dumped) message in the console.

[rtfeldman]

Hm, what happens if you run roc edit from the command line? Same error?

[nick-gravgaard]

Nope, roc edit works and does not output an error message to the console when I close the window.

[nick-gravgaard]

The ZDG_RUNTIME_DIR env var is set to /run/user/1000 in my shell before I run roc. Is there any reason why this env var would not be visible when the GUI example is built before being run? (as opposed to running the built binary directly which does successfully open a window)

[skyqrose]

The gui example was broken and was removed from the repo in #6917. It's now in roc-lang/examples#190 , in a better state (but still not merged). I'm not sure if this problem still exists, but if it does, it would belong as an issue in the other repo now.