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Rollup merge of #74977 - GuillaumeGomez:cleanup-e0741, r=pickfire 

Clean up E0741 error explanation

r? @Dylan-DPC
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Manish Goregaokar 2020-08-01 09:30:11 -07:00 committed by GitHub
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src/librustc_error_codes/error_codes/E0741.md
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@ -1,5 +1,6 @@
Only structural-match types (that is, types that derive `PartialEq` and `Eq`)
may be used as the types of const generic parameters.
A non-structural-match type was used as the type of a const generic parameter.
Erroneous code example:
```compile_fail,E0741
#![feature(const_generics)]
@ -9,12 +10,15 @@ struct A;
struct B<const X: A>; // error!
```
To fix this example, we derive `PartialEq` and `Eq`.
Only structural-match types (that is, types that derive `PartialEq` and `Eq`)
may be used as the types of const generic parameters.
To fix the previous code example, we derive `PartialEq` and `Eq`:
```
#![feature(const_generics)]
#[derive(PartialEq, Eq)]
#[derive(PartialEq, Eq)] // We derive both traits here.
struct A;
struct B<const X: A>; // ok!