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Improve the diagnostics for unused generic parameters

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León Orell Valerian Liehr 2024-02-01 15:58:07 +01:00
parent cb4d9a1902
commit 02320b502d
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43 changed files with 370 additions and 170 deletions
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6
compiler/rustc_error_codes/src/error_codes/E0091.md
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@ -1,11 +1,11 @@
An unnecessary type or const parameter was given in a type alias.
An unnecessary type parameter was given in a type alias.
Erroneous code example:
```compile_fail,E0091
type Foo<T> = u32; // error: type parameter `T` is unused
type Foo<T> = u32; // error: type parameter `T` is never used
// or:
type Foo<A,B> = Box<A>; // error: type parameter `B` is unused
type Foo<A, B> = Box<A>; // error: type parameter `B` is never used
```
Please check you didn't write too many parameters. Example: