error[E0599]: no method named `contains` found for struct `FieldRef<UserSchema, i32>` in the current scope
  --> tests/ui/fail/string_op_on_int_field.rs:11:25
   |
11 |     let _ = user::age().contains("test");
   |                         ^^^^^^^^ method not found in `FieldRef<UserSchema, i32>`
   |
   = note: the method was found for
           - `FieldRef<S, std::string::String>`
