[rustc.git] / src / librustc_error_codes / error_codes / E0567.md

Generics have been used on an auto trait.

Erroneous code example:

```compile_fail,E0567
#![feature(optin_builtin_traits)]

auto trait Generic<T> {} // error!
# fn main() {}
```

Since an auto trait is implemented on all existing types, the
compiler would not be able to infer the types of the trait's generic
parameters.

To fix this issue, just remove the generics:

```
#![feature(optin_builtin_traits)]

auto trait Generic {} // ok!
# fn main() {}
```
Commit	Line	Data
60c5eb7d XL	1	Generics have been used on an auto trait.
	2
	3	Erroneous code example:
	4
	5	```compile_fail,E0567
	6	#![feature(optin_builtin_traits)]
	7
	8	auto trait Generic<T> {} // error!
f9f354fc	9	# fn main() {}
60c5eb7d XL	10	```
	11
	12	Since an auto trait is implemented on all existing types, the
	13	compiler would not be able to infer the types of the trait's generic
	14	parameters.
	15
	16	To fix this issue, just remove the generics:
	17
	18	```
	19	#![feature(optin_builtin_traits)]
	20
	21	auto trait Generic {} // ok!
f9f354fc	22	# fn main() {}
60c5eb7d	23	```