```coq
Definition Self : Ty.t := Ty.path "core::fmt::Error".

(* ... *)

Axiom Implements :
M.IsTraitInstance
"core::cmp::PartialEq"
(* Trait polymorphic consts *) []
(* Trait polymorphic types *) []
Self
(* Instance *) [ ("eq", InstanceField.Method eq) ].
```

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