Error code E0778

The instruction_set attribute was malformed.

Erroneous code example:

#![feature(isa_attribute)]

#[instruction_set()] // error: expected one argument
pub fn something() {}
fn main() {}
Run

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() {}
Run

or:

#![feature(isa_attribute)]

#[cfg_attr(target_arch="arm", instruction_set(arm::t32))]
fn something() {}
Run

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

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