zig/doc/langref/test_pointer_to_non-byte_aligned_field.zig

const std = @import("std");
const expectEqual = std.testing.expectEqual;

const BitField = packed struct {
    a: u3,
    b: u3,
    c: u2,
};

var foo = BitField{
    .a = 1,
    .b = 2,
    .c = 3,
};

test "pointer to non-byte-aligned field" {
    const ptr = &foo.b;
    try expectEqual(2, ptr.*);
}

// test