src/doc/rust-by-example/src/attribute/unused.md

   1 # `dead_code`
   2
   3 The compiler provides a `dead_code`
   4 [*lint*][lint] that will warn
   5 about unused functions. An *attribute* can be used to disable the lint.
   6
   7 ```rust,editable
   8 fn used_function() {}
   9
  10 // `#[allow(dead_code)]` is an attribute that disables the `dead_code` lint
  11 #[allow(dead_code)]
  12 fn unused_function() {}
  13
  14 fn noisy_unused_function() {}
  15 // FIXME ^ Add an attribute to suppress the warning
  16
  17 fn main() {
  18     used_function();
  19 }
  20 ```
  21
  22 Note that in real programs, you should eliminate dead code. In these examples
  23 we'll allow dead code in some places because of the interactive nature of the
  24 examples.
  25
  26 [lint]: https://en.wikipedia.org/wiki/Lint_%28software%29