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error[E0053]: method `call_once` has an incompatible type for trait
  --> $DIR/fn-traits-call-once-signature-15094.rs:13:5
   |
LL |     fn call_once(self, _args: ()) {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected "rust-call" fn, found "Rust" fn
   |
   = note: expected signature `extern "rust-call" fn(Debuger<_>, ())`
              found signature `fn(Debuger<_>, ())`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0053`.