error: The associated_to attribute can only be used on static methods.
  --> tests/ui/invalid-associated-to-attribute.rs:10:29
   |
10 |         fn immutable_method(&self);
   |                             ^^^^^

error: The associated_to attribute can only be used on static methods.
  --> tests/ui/invalid-associated-to-attribute.rs:13:27
   |
13 |         fn mutable_method(&mut self);
   |                           ^^^^^^^^^

error: The associated_to attribute can only be used on static methods.
  --> tests/ui/invalid-associated-to-attribute.rs:16:25
   |
16 |         fn owned_method(self);
   |                         ^^^^