Setting an individual element of a vector of u1 sets all elements

[notcancername]

Zig Version

0.11.0-dev.672+e94504543

Steps to Reproduce and Observed Behavior

1. Compile this code with zig build-exe on x86_64

const std = @import("std");

pub fn main() void {
    var v = @Vector(4, u1){1, 1, 1, 1};
    std.debug.print("{any}\n", .{v}); // { 1, 1, 1, 1 }
    v[0] = 0;
    std.debug.print("{any}\n", .{v}); // expected { 0, 1, 1, 1}, got {0, 0, 0, 0}
}

2. Run the generated executable. Observe that the output does not match the expected output.

Expected Behavior

I expected the generated executable to print

{ 1, 1, 1, 1 }
{ 1, 1, 1, 1}

, but it printed

{ 1, 1, 1, 1 }
{ 0, 0, 0, 0 }

.

[nektro]

different but related: #13279