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The `instruction_set` attribute was malformed.
Erroneous code example:
```compile_fail,E0778
#![feature(isa_attribute)]
#[instruction_set()] // error: expected one argument
pub fn something() {}
fn main() {}
```
The parenthesized `instruction_set` attribute requires the parameter to be
specified:
```
#![feature(isa_attribute)]
#[cfg_attr(target_arch="arm", instruction_set(arm::a32))]
fn something() {}
```
or:
```
#![feature(isa_attribute)]
#[cfg_attr(target_arch="arm", instruction_set(arm::t32))]
fn something() {}
```
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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