diff options
| -rw-r--r-- | src/librustc_error_codes/error_codes/E0750.md | 22 | ||||
| -rw-r--r-- | src/tools/tidy/src/error_codes_check.rs | 3 |
2 files changed, 19 insertions, 6 deletions
diff --git a/src/librustc_error_codes/error_codes/E0750.md b/src/librustc_error_codes/error_codes/E0750.md index e0cf56f716f..905e852f8d5 100644 --- a/src/librustc_error_codes/error_codes/E0750.md +++ b/src/librustc_error_codes/error_codes/E0750.md @@ -1,4 +1,18 @@ -Negative impls cannot be default impls. A default impl supplies -default values for the items within to be used by other impls, whereas -a negative impl declares that there are no other impls. These don't -make sense to combine. +A negative impl was made default impl. + +Erroneous code example: + +```compile_fail,E0750 +# #![feature(negative_impls)] +# #![feature(specialization)] +trait MyTrait { + type Foo; +} + +default impl !MyTrait for u32 {} // error! +# fn main() {} +``` + +Negative impls cannot be default impls. A default impl supplies default values +for the items within to be used by other impls, whereas a negative impl declares +that there are no other impls. Combining it does not make sense. diff --git a/src/tools/tidy/src/error_codes_check.rs b/src/tools/tidy/src/error_codes_check.rs index 51f135d3761..9c36d853ef7 100644 --- a/src/tools/tidy/src/error_codes_check.rs +++ b/src/tools/tidy/src/error_codes_check.rs @@ -16,8 +16,7 @@ const EXEMPTED_FROM_TEST: &[&str] = &[ ]; // Some error codes don't have any tests apparently... -const IGNORE_EXPLANATION_CHECK: &[&str] = - &["E0570", "E0601", "E0602", "E0639", "E0729", "E0749", "E0750"]; +const IGNORE_EXPLANATION_CHECK: &[&str] = &["E0570", "E0601", "E0602", "E0639", "E0729", "E0749"]; fn check_error_code_explanation( f: &str, |