compiler/rustc_error_codes/src/error_codes/E0453.md

   1 A lint check attribute was overruled by a `forbid` directive set as an
   2 attribute on an enclosing scope, or on the command line with the `-F` option.
   3
   4 Example of erroneous code:
   5
   6 ```compile_fail,E0453
   7 #![forbid(non_snake_case)]
   8
   9 #[allow(non_snake_case)]
  10 fn main() {
  11     let MyNumber = 2; // error: allow(non_snake_case) overruled by outer
  12                       //        forbid(non_snake_case)
  13 }
  14 ```
  15
  16 The `forbid` lint setting, like `deny`, turns the corresponding compiler
  17 warning into a hard error. Unlike `deny`, `forbid` prevents itself from being
  18 overridden by inner attributes.
  19
  20 If you're sure you want to override the lint check, you can change `forbid` to
  21 `deny` (or use `-D` instead of `-F` if the `forbid` setting was given as a
  22 command-line option) to allow the inner lint check attribute:
  23
  24 ```
  25 #![deny(non_snake_case)]
  26
  27 #[allow(non_snake_case)]
  28 fn main() {
  29     let MyNumber = 2; // ok!
  30 }
  31 ```
  32
  33 Otherwise, edit the code to pass the lint check, and remove the overruled
  34 attribute:
  35
  36 ```
  37 #![forbid(non_snake_case)]
  38
  39 fn main() {
  40     let my_number = 2;
  41 }
  42 ```