This error occurs when you defined methods or associated functions with same name.
Erroneous code example:
struct Foo; impl Foo { fn bar() {} // previous definition here } impl Foo { fn bar() {} // duplicate definition here }
A similar error is E0201. The difference is whether there is one declaration block or not. To avoid this error, you must give each fn
a unique name.
struct Foo; impl Foo { fn bar() {} } impl Foo { fn baz() {} // define with different name }