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# Error code E0779

An unknown argument was given to the `instruction_set` attribute.

Erroneous code example:

    #![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(target_arch="arm", instruction_set(arm::a32))] // ok!
    pub fn something() {}
    fn main() {}

For more information see the `instruction_set` attribute section of the Reference.