Can't automock struct when defining own type

[ghost]

I'm recently started using mockall and noticed if a custom result type is used the following code fails to compile:

type Result<T> = std::result::Result<T, String>;

struct MyStruct {}

#[automock]
impl MyStruct {
    fn ret_res() -> Result<String> {
        unimplemented!()
    }
}

cargo build output:

#[automock]
| ^^^^^^^^^^^ unexpected type argument