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`#[ffi_returns_twice]` was used on something other than a foreign function
declaration.
Erroneous code example:
```compile_fail,E0724
#![feature(ffi_returns_twice)]
#![crate_type = "lib"]
#[ffi_returns_twice] // error!
pub fn foo() {}
```
`#[ffi_returns_twice]` can only be used on foreign function declarations.
For example, we might correct the previous example by declaring
the function inside of an `extern` block.
```
#![feature(ffi_returns_twice)]
extern "C" {
#[ffi_returns_twice] // ok!
pub fn foo();
}
```
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