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# Error code E0535

#### 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:

    #[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 section of the Reference.