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#### Note: this error code is no longer emitted by the compiler
This is because it was too specific to the `inline` attribute.
Similar diagnostics occur for other attributes too.
The example here will now emit `E0539`
Erroneous code example:
```compile_fail,E0539
#[inline(unknown)] // error: invalid argument
pub fn something() {}
fn main() {}
```
The `inline` attribute only supports two arguments:
* always
* never
All other arguments given to the `inline` attribute will return this error.
Example:
```
#[inline(never)] // ok!
pub fn something() {}
fn main() {}
```
For more information see the [`inline` Attribute][inline-attribute] section
of the Reference.
[inline-attribute]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-inline-attribute
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