rust/src/test/ui/conditional-compilation/cfg-attr-unknown-attribute-macro-expansion.stderr

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error: cannot find attribute `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
|
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to previous error