bors 703f2e1685 Auto merge of #85041 - mibac138:suggest-generics, r=estebank ... Suggest adding a type parameter for impls Add a new suggestion upon encountering an unknown type in a `impl` that suggests adding a new type parameter. This diagnostic suggests to add a new type parameter even though it may be a const parameter, however after adding the parameter and running rustc again a follow up error steers the user to change the type parameter to a const parameter. ```rust struct X<const C: ()>(); impl X<C> {} ``` suggests ``` error[E0412]: cannot find type `C` in this scope --> bar.rs:2:8 | 1 | struct X<const C: ()>(); | ------------------------ similarly named struct `X` defined here 2 | impl X<C> {} | ^ | help: a struct with a similar name exists | 2 | impl X<X> {} | ^ help: you might be missing a type parameter | 2 | impl<C> X<C> {} | ^^^ ``` After adding a type parameter the code now becomes ```rust struct X<const C: ()>(); impl<C> X<C> {} ``` and the error now fully steers the user towards the correct code ``` error[E0747]: type provided when a constant was expected --> bar.rs:2:11 | 2 | impl<C> X<C> {} | ^ | help: consider changing this type parameter to be a `const` generic | 2 | impl<const C: ()> X<C> {} | ^^^^^^^^^^^ ``` r? `@estebank` Somewhat related #84946		2021-05-13 08:08:20 +00:00
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src	Auto merge of #85041 - mibac138:suggest-generics, r=estebank	2021-05-13 08:08:20 +00:00
Cargo.toml	bumped smallvec deps	2021-02-14 18:03:11 +03:00