Add note for E0117

[GuillaumeGomez]

Fixes#39249.

I just applied the suggestion of @durka since I don't see anything else to add.

[rust-highfive]

r? @eddyb

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[eddyb]

Could you add a test? r=me otherwise

@bors rollup

[GuillaumeGomez]

Sorry forgot to add them. Updated.

@bors r=eddyb rollup

[bors]

📌 Commit 1769f80 has been approved by eddyb

[durka]

Travis failure looks real.

error: /checkout/src/test/compile-fail/coherence-impls-copy.rs:48: unexpected "note": '48:1: 48:26: the impl does not reference any types defined in this crate'
error: /checkout/src/test/compile-fail/coherence-impls-copy.rs:48: unexpected "note": '48:1: 48:26: define and implement a trait or new type instead'
error: /checkout/src/test/compile-fail/coherence-impls-copy.rs:42: expected note not found: define and implement a trait or new type instead
error: /checkout/src/test/compile-fail/coherence-impls-copy.rs:42: expected note not found: the impl does not reference any types defined in this crate

I guess the order of the notes matters?

[GuillaumeGomez]

Ok, fixed (very weird case). Thanks for the notification @durka!

@bors: r=eddyb rollup

[bors]

📌 Commit eaf182e has been approved by eddyb