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Diffstat (limited to 'compiler/rustc_error_codes/src/error_codes/E0116.md')
-rw-r--r-- | compiler/rustc_error_codes/src/error_codes/E0116.md | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/compiler/rustc_error_codes/src/error_codes/E0116.md b/compiler/rustc_error_codes/src/error_codes/E0116.md new file mode 100644 index 000000000..653be6029 --- /dev/null +++ b/compiler/rustc_error_codes/src/error_codes/E0116.md @@ -0,0 +1,27 @@ +An inherent implementation was defined for a type outside the current crate. + +Erroneous code example: + +```compile_fail,E0116 +impl Vec<u8> { } // error +``` + +You can only define an inherent implementation for a type in the same crate +where the type was defined. For example, an `impl` block as above is not allowed +since `Vec` is defined in the standard library. + +To fix this problem, you can either: + + - define a trait that has the desired associated functions/types/constants and + implement the trait for the type in question + - define a new type wrapping the type and define an implementation on the new + type + +Note that using the `type` keyword does not work here because `type` only +introduces a type alias: + +```compile_fail,E0116 +type Bytes = Vec<u8>; + +impl Bytes { } // error, same as above +``` |