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Add explanation message for E0203

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This commit is contained in:
Nixon 2019-11-29 22:16:26 +00:00
parent fe969f4ec6
commit f8fb24f18f
3 changed files with 14 additions and 2 deletions
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3
src/librustc_error_codes/error_codes.rs
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@ -107,6 +107,7 @@ E0199: include_str!("./error_codes/E0199.md"),
E0200: include_str!("./error_codes/E0200.md"),
E0201: include_str!("./error_codes/E0201.md"),
E0202: include_str!("./error_codes/E0202.md"),
E0203: include_str!("./error_codes/E0203.md"),
E0204: include_str!("./error_codes/E0204.md"),
E0205: include_str!("./error_codes/E0205.md"),
E0206: include_str!("./error_codes/E0206.md"),
@ -446,8 +447,6 @@ E0745: include_str!("./error_codes/E0745.md"),
// E0190, // deprecated: can only cast a &-pointer to an &-object
// E0194, // merged into E0403
// E0196, // cannot determine a type for this closure
E0203, // type parameter has more than one relaxed default bound,
// and only one is supported
E0208,
// E0209, // builtin traits can only be implemented on structs or enums
E0212, // cannot extract an associated type from a higher-ranked trait bound

12
src/librustc_error_codes/error_codes/E0203.md Normal file
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@ -0,0 +1,12 @@
Having multiple relaxed default bounds is unsuported.
Erroneous code example:
```compile_fail,E0203
trait Foo {}
struct S5<T>(*const T) where T: ?Foo + ?Sized;
```
Here the type `T` cannot have a relaxed bound for both `Foo` and `Sized`

1
src/test/ui/maybe-bounds-where.stderr
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@ -42,3 +42,4 @@ LL | struct S5<T>(*const T) where T: ?Trait<'static> + ?Sized;
error: aborting due to 6 previous errors
For more information about this error, try `rustc --explain E0203`.