thread 'main' panicked

[carlolalu]

Following the tutorial on Hands-on Rust I found that compiling flappy I get this error:

thread 'main' panicked at library/core/src/panicking.rs:221:5:
unsafe precondition(s) violated: slice::from_raw_parts requires the pointer to be aligned and non-null, and the total size of the slice not to exceed `isize::MAX`
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread caused non-unwinding panic. aborting.
Aborted (core dumped)

I do not use nightly rust, and my setup was completely following the book. Searching online I found this issue https://github.com/KyleMayes/vulkanalia/issues/254. Could it be related somehow?

[sisso]

I have a project that was working yesterday and today is having this issue. From stackoverflow

A recent change to the standard library enabled debug assertions in core/std to fire if the user compiles in debug mode

That appears to be on rust 1.78, I downgrade my project to 1.77.1 (not sure why 1.77.2 toolchain fail to install):

rustup install 1.77.1
echo "1.77.1" > rust-toolchain

The workarounds appears to be:

1. You need to wait for a fix (not sure where)
2. compile on release mode
3. use a older toolchain < 1.78

[MichaelMackus]

This appears related to the wayland backend on linux, at least it was for me. You can also workaround this error by running it via the x11 winit backend x11: WINIT_UNIX_BACKEND=x11 cargo run

I'm not sure why this is failing, since the winit examples run fine for me in wayland.

[MichaelMackus]

Ah, I've traced it down to the glutin version that is tagged. When I try to run the window example in glutin v0.29.1 I get the same error from glutin:

thread 'main' panicked at library/core/src/panicking.rs:219:5:
unsafe precondition(s) violated: slice::from_raw_parts requires the pointer to be aligned and non-null, and the total size of the slice not to exceed `isize::MAX`
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread caused non-unwinding panic. aborting.
Aborted

The glutin examples work fine at the latest version. Not sure how easy that is to upgrade, but it could just be a version change.