| error[E0658]: rust-call ABI is subject to change (see issue #29625) | |
| --> $DIR/feature-gate-unboxed-closures.rs:16:5 | |
| | | |
| LL | / extern "rust-call" fn call_once(self, (a, b): (u32, u32)) -> u32 { | |
| LL | | a + b | |
| LL | | } | |
| | |_____^ | |
| | | |
| = help: add #![feature(unboxed_closures)] to the crate attributes to enable | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0658`. |