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+error: functions with the "rust-call" ABI must take a single non-self argument that is a tuple
+ --> $DIR/overloaded-calls-nontuple.rs:11:5
+ |
+LL | extern "rust-call" fn call_mut(&mut self, z: isize) -> isize {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: functions with the "rust-call" ABI must take a single non-self argument that is a tuple
+ --> $DIR/overloaded-calls-nontuple.rs:19:5
+ |
+LL | extern "rust-call" fn call_once(mut self, z: isize) -> isize { self.call_mut(z) }
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0059]: cannot use call notation; the first type parameter for the function trait is neither a tuple nor unit
+ --> $DIR/overloaded-calls-nontuple.rs:28:10
+ |
+LL | drop(s(3))
+ | ^^^^
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0059`.