src/test/ui/issues/issue-15094.stderr

   1 error[E0053]: method `call_once` has an incompatible type for trait
   2   --> $DIR/issue-15094.rs:11:5
   3    |
   4 LL |     fn call_once(self, _args: ()) {
   5    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected "rust-call" fn, found "Rust" fn
   6    |
   7    = note: expected fn pointer `extern "rust-call" fn(Debuger<_>, ())`
   8               found fn pointer `fn(Debuger<_>, ())`
   9
  10 error: aborting due to previous error
  11
  12 For more information about this error, try `rustc --explain E0053`.