Assertion failure in const_ptr_pointee_unchecked_no_isf

[nmeum]

Zig Version

0.9.0-dev.1444+e2a2e6c14

Steps to Reproduce

Attempt to run the following with zig test:

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

pub const Header = packed struct {
    version: u2,
    type: u2,
    token_len: u4,
    code: u8,
    message_id: u16,
};

test "test packed struct" {
    const buf: []const u8 = &[_]u8{ 80, 3, 121, 80 };

    const w = buf[0..@sizeOf(Header)];
    const hdr = @ptrCast(*const Header, w);

    try expect(hdr.version == 1);
}

Expected Behavior

No compiler crash.

Actual Behavior

A compiler crash:

$ zig test test.zig
Assertion failed at /home/vsts/work/1/s/src/stage1/ir.cpp:564 in const_ptr_pointee_unchecked_no_isf. This is a bug in the Zig compiler.thread 19566 panic:
Unable to dump stack trace: debug info stripped
Aborted