zig/test/cases/safety/@alignCast misaligned.zig

const std = @import("std");

pub fn panic(message: []const u8, stack_trace: ?*std.builtin.StackTrace, _: ?usize) noreturn {
    _ = stack_trace;
    if (std.mem.eql(u8, message, "incorrect alignment")) {
        std.process.exit(0);
    }
    std.process.exit(1);
}

pub fn main() !void {
    var array align(4) = [_]u32{ 0x11111111, 0x11111111 };
    const bytes = std.mem.sliceAsBytes(array[0..]);
    if (foo(bytes) != 0x11111111) return error.Wrong;
    return error.TestFailed;
}
fn foo(bytes: []u8) u32 {
    const slice4 = bytes[1..5];
    const aligned: *align(4) [4]u8 = @alignCast(slice4);
    const int_slice = std.mem.bytesAsSlice(u32, aligned);
    return int_slice[0];
}
// run
// backend=selfhosted,llvm
// target=x86_64-linux,aarch64-linux