compiler/rustc_error_codes/src/error_codes/E0779.md

   1 An unknown argument was given to the `instruction_set` attribute.
   2
   3 Erroneous code example:
   4
   5 ```compile_fail,E0779
   6 #![feature(isa_attribute)]
   7
   8 #[instruction_set(intel::x64)] // error: invalid argument
   9 pub fn something() {}
  10 fn main() {}
  11 ```
  12
  13 The `instruction_set` attribute only supports two arguments currently:
  14
  15  * arm::a32
  16  * arm::t32
  17
  18 All other arguments given to the `instruction_set` attribute will return this
  19 error. Example:
  20
  21 ```
  22 #![feature(isa_attribute)]
  23
  24 #[cfg_attr(target_arch="arm", instruction_set(arm::a32))] // ok!
  25 pub fn something() {}
  26 fn main() {}
  27 ```
  28
  29 For more information see the [`instruction_set` attribute][isa-attribute]
  30 section of the Reference.
  31
  32 [isa-attribute]: https://doc.rust-lang.org/reference/attributes/codegen.html