error: cannot find attribute macro `unknown` in this scope | |
--> $DIR/cfg-attr-unknown-attribute-macro-expansion.rs:3:27 | |
| | |
LL | #[cfg_attr(all(), unknown)] | |
| ^^^^^^^ | |
... | |
LL | foo!(); | |
| ------- in this macro invocation | |
error: aborting due to previous error | |