| error[E0658]: The attribute `unknown` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642) |
| --> $DIR/cfg-attr-unknown-attribute-macro-expansion.rs:13:27 |
| | |
| LL | #[cfg_attr(all(), unknown)] //~ ERROR `unknown` is currently unknown |
| | ^^^^^^^ |
| ... |
| LL | foo!(); |
| | ------- in this macro invocation |
| | |
| = help: add #![feature(custom_attribute)] to the crate attributes to enable |
| |
| error: aborting due to previous error |
| |
| For more information about this error, try `rustc --explain E0658`. |
