# Objective

It seems the behavior of field attributes was accidentally broken at
some point. Take the following code:

```rust
#[derive(Reflect)]
struct Foo {
  #[reflect(ignore, default)]
  value: usize
}
```

The above code should simply mark `value` as ignored and specify a
default behavior. However, what this actually does is discard both.
That's especially a problem when we don't want the field to be be given
a `Reflect` or `FromReflect` bound (which is why we ignore it in the
first place).

This only happens when the attributes are combined into one. The
following code works properly:

```rust
#[derive(Reflect)]
struct Foo {
  #[reflect(ignore)]
  #[reflect(default)]
  value: usize
}
```

## Solution

Cleaned up the field attribute parsing logic to support combined field
attributes.

---

## Changelog

- Fixed a bug where `Reflect` derive attributes on fields are not able
to be combined into a single attribute