diff options
Diffstat (limited to 'compiler/rustc_error_codes/src/error_codes/E0185.md')
-rw-r--r-- | compiler/rustc_error_codes/src/error_codes/E0185.md | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/compiler/rustc_error_codes/src/error_codes/E0185.md b/compiler/rustc_error_codes/src/error_codes/E0185.md new file mode 100644 index 000000000..944a93ed1 --- /dev/null +++ b/compiler/rustc_error_codes/src/error_codes/E0185.md @@ -0,0 +1,35 @@ +An associated function for a trait was defined to be static, but an +implementation of the trait declared the same function to be a method (i.e., to +take a `self` parameter). + +Erroneous code example: + +```compile_fail,E0185 +trait Foo { + fn foo(); +} + +struct Bar; + +impl Foo for Bar { + // error, method `foo` has a `&self` declaration in the impl, but not in + // the trait + fn foo(&self) {} +} +``` + +When a type implements a trait's associated function, it has to use the same +signature. So in this case, since `Foo::foo` does not take any argument and +does not return anything, its implementation on `Bar` should be the same: + +``` +trait Foo { + fn foo(); +} + +struct Bar; + +impl Foo for Bar { + fn foo() {} // ok! +} +``` |