compiler/rustc_error_codes/src/error_codes/E0778.md

   1 The `instruction_set` attribute was malformed.
   2
   3 Erroneous code example:
   4
   5 ```compile_fail,E0778
   6 #![feature(isa_attribute)]
   7
   8 #[instruction_set()] // error: expected one argument
   9 pub fn something() {}
  10 fn main() {}
  11 ```
  12
  13 The parenthesized `instruction_set` attribute requires the parameter to be
  14 specified:
  15
  16 ```
  17 #![feature(isa_attribute)]
  18
  19 #[cfg_attr(target_arch="arm", instruction_set(arm::a32))]
  20 fn something() {}
  21 ```
  22
  23 or:
  24
  25 ```
  26 #![feature(isa_attribute)]
  27
  28 #[cfg_attr(target_arch="arm", instruction_set(arm::t32))]
  29 fn something() {}
  30 ```
  31
  32 For more information see the [`instruction_set` attribute][isa-attribute]
  33 section of the Reference.
  34
  35 [isa-attribute]: https://doc.rust-lang.org/reference/attributes/codegen.html