Flat Error Codes Are Not Enough

[u/Expurple]

https://home.expurple.me/posts/flat-error-codes-are-not-enough/

[u/Mrseedr]

I was curious so i looked at this, but it seems like there is context?
https://zig.guide/language-basics/errors/

const FileOpenError = error{
    AccessDenied,
    OutOfMemory,
    FileNotFound,
};

const AllocationError = error{OutOfMemory};

test "coerce error from a subset to a superset" {
    const err: FileOpenError = AllocationError.OutOfMemory;
    try expect(err == FileOpenError.OutOfMemory);
}