rust/tests/ui/conditional-compilation/cfg-attr-empty-is-unused.rs

12 lines
296 B
Rust

// Check that `#[cfg_attr($PREDICATE,)]` triggers the `unused_attribute` lint.
#![deny(unused)]
#[cfg_attr(FALSE,)] //~ ERROR `#[cfg_attr]` does not expand to any attributes
fn _f() {}
#[cfg_attr(not(FALSE),)] //~ ERROR `#[cfg_attr]` does not expand to any attributes
fn _g() {}
fn main() {}