zig/doc/langref/runtime_incorrect_pointer_alignment.zig

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Zig

const mem = @import("std").mem;
pub fn main() !void {
var array align(4) = [_]u32{ 0x11111111, 0x11111111 };
const bytes = mem.sliceAsBytes(array[0..]);
if (foo(bytes) != 0x11111111) return error.Wrong;
}
fn foo(bytes: []u8) u32 {
const slice4 = bytes[1..5];
const int_slice = mem.bytesAsSlice(u32, @as([]align(4) u8, @alignCast(slice4)));
return int_slice[0];
}
// exe=fail