pub const DISPFlags = packed struct(u32) {
    Virtuality: enum(u2) { Zero, Virtual, PureVirtual } = .Zero,
    LocalToUnit: bool = false,
    Definition: bool = false,
    Optimized: bool = false,
    Pure: bool = false,
    Elemental: bool = false,
    Recursive: bool = false,
    MainSubprogram: bool = false,
    Deleted: bool = false,
    ReservedBit10: u1 = 0,
    ObjCDirect: bool = false,
    Unused: u20 = 0,

    pub fn format(
        self: DISPFlags,
        comptime _: []const u8,
        _: std.fmt.FormatOptions,
        writer: anytype,
    ) @TypeOf(writer).Error!void {
        var need_pipe = false;
        inline for (@typeInfo(DISPFlags).@"struct".fields) |field| {
            switch (@typeInfo(field.type)) {
                .bool => if (@field(self, field.name)) {
                    if (need_pipe) try writer.writeAll(" | ") else need_pipe = true;
                    try writer.print("DISPFlag{s}", .{field.name});
                },
                .@"enum" => if (@field(self, field.name) != .Zero) {
                    if (need_pipe) try writer.writeAll(" | ") else need_pipe = true;
                    try writer.print("DISPFlag{s}", .{@tagName(@field(self, field.name))});
                },
                .int => assert(@field(self, field.name) == 0),
                else => @compileError("bad field type: " ++ field.name ++ ": " ++
                    @typeName(field.type)),
            }
        }
        if (!need_pipe) try writer.writeByte('0');
    }
}