error[E0599]: no function or associated item named `sunder` found for type `Counter` in the current scope
  --> /tmp/mantle_generated/no_service_derive_ctor.rs:11:16
   |
11 |     <Counter>::sunder(service);
   |                ^^^^^^ function or associated item not found in `Counter`
   | 
  ::: $DIR/no_service_derive.rs:3:1
   |
3  | pub struct Counter(u32);
   | ------------------------ function or associated item `sunder` not found for this
   |
   = help: items from traits can only be used if the trait is implemented and in scope
   = note: the following trait defines an item `sunder`, perhaps you need to implement it:
           candidate #1: `mantle::exe::Service`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0599`.