wrong value loaded from sub-byte-aligned pointer to global variable

[andrewrk]

Zig Version: 0.10.0-dev.3477+e28567538

Passes for stage1, fails for stage3.

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

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 expect(ptr.* == 2);
}

Similar test that should also pass to close this issue:

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

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

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

test "sub-byte-aligned fields share the same address" {
    try expect(@ptrToInt(&bit_field.a) == @ptrToInt(&bit_field.b));
    try expect(@ptrToInt(&bit_field.a) == @ptrToInt(&bit_field.c));
}

Before closing this issue, be sure to remove {#backend_stage1#} from these two places in the language reference:

• todo link here
• todo link here