1 error[E0053]: method `call_once` has an incompatible type for trait
2 --> $DIR/issue-15094.rs:21:5
4 LL | fn call_once(self, _args: ()) {
5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected "rust-call" fn, found "Rust" fn
7 = note: expected type `extern "rust-call" fn(Debuger<T>, ())`
8 found type `fn(Debuger<T>, ())`
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0053`.