error[E0277]: functions with the "rust-call" ABI must take a single non-self tuple argument --> $DIR/issue-22565-rust-call.rs:3:1 | LL | extern "rust-call" fn b(_i: i32) {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Tuple` is not implemented for `i32` error: functions with the "rust-call" ABI must take a single non-self tuple argument --> $DIR/issue-22565-rust-call.rs:17:5 | LL | extern "rust-call" fn bar() {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: functions with the "rust-call" ABI must take a single non-self tuple argument --> $DIR/issue-22565-rust-call.rs:22:5 | LL | extern "rust-call" fn a() {} | ^^^^^^^^^^^^^^^^^^^^^^^^^ error: functions with the "rust-call" ABI must take a single non-self tuple argument --> $DIR/issue-22565-rust-call.rs:7:5 | LL | extern "rust-call" fn a(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^ error: functions with the "rust-call" ABI must take a single non-self tuple argument --> $DIR/issue-22565-rust-call.rs:10:5 | LL | extern "rust-call" fn b() {} | ^^^^^^^^^^^^^^^^^^^^^^^^^ error: aborting due to 5 previous errors For more information about this error, try `rustc --explain E0277`.