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() {}
The parenthesized instruction_set
attribute requires the parameter to be
specified:
#![allow(unused)] #![feature(isa_attribute)] fn main() { #[cfg_attr(target_arch="arm", instruction_set(arm::a32))] fn something() {} }
or:
#![allow(unused)] #![feature(isa_attribute)] fn main() { #[cfg_attr(target_arch="arm", instruction_set(arm::t32))] fn something() {} }
For more information see the instruction_set
attribute
section of the Reference.