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An unknown argument was given to the `instruction_set` attribute.
Erroneous code example:
```compile_fail,E0779
#![feature(isa_attribute)]
#[instruction_set(intel::x64)] // error: invalid argument
pub fn something() {}
fn main() {}
```
The `instruction_set` attribute only supports two arguments currently:
* arm::a32
* arm::t32
All other arguments given to the `instruction_set` attribute will return this
error. Example:
```
#![feature(isa_attribute)]
#[cfg_attr(all(target_arch="arm", target_os="none"), instruction_set(arm::a32))] // ok!
pub fn something() {}
fn main() {}
```
For more information see the [`instruction_set` attribute][isa-attribute]
section of the Reference.
[isa-attribute]: https://doc.rust-lang.org/reference/attributes/codegen.html
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