#![feature(ffi_const)] #![crate_type = "lib"] #[ffi_const] //~ ERROR `#[ffi_const]` may only be used on foreign functions pub fn foo() {} #[ffi_const] //~ ERROR `#[ffi_const]` may only be used on foreign functions macro_rules! bar { () => () } extern "C" { #[ffi_const] //~ ERROR `#[ffi_const]` may only be used on foreign functions static INT: i32; }