internal compiler error: adt::represent_type called on non-ADT type: &string_cache::atom::Atom in Servo

[Ms2ger]

Branch: https://github.com/Ms2ger/servo/tree/ICE-attr-prefix-atom

[tamird]

Rebased that branch in servo/servo#5777 and could not reproduce the ICE. Suggest closing this.

[tamird]

@steveklabnik this should be good to close.

[steveklabnik]

Let me know if you need this re-opened, @Ms2ger