fn readVec(r: *Io.Reader, data: [][]u8) Io.Reader.Error!usize
fn readVec(r: *Io.Reader, data: [][]u8) Io.Reader.Error!usize { _ = data; const fr: *File.Reader = @alignCast(@fieldParentPtr("interface", r)); const context: *Context = @fieldParentPtr("fr", fr); try fillUntimed(context, 1); return 0; }