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1 An associated function for a trait was defined to be static, but an
2 implementation of the trait declared the same function to be a method (i.e., to
3 take a `self` parameter).
4
5 Erroneous code example:
6
7 ```compile_fail,E0185
8 trait Foo {
9 fn foo();
10 }
11
12 struct Bar;
13
14 impl Foo for Bar {
15 // error, method `foo` has a `&self` declaration in the impl, but not in
16 // the trait
17 fn foo(&self) {}
18 }
19 ```
20
21 When a type implements a trait's associated function, it has to use the same
22 signature. So in this case, since `Foo::foo` does not take any argument and
23 does not return anything, its implementation on `Bar` should be the same:
24
25 ```
26 trait Foo {
27 fn foo();
28 }
29
30 struct Bar;
31
32 impl Foo for Bar {
33 fn foo() {} // ok!
34 }
35 ```