output of rustc +enzyme --version --verbose:

rustc 1.84.0-nightly (1203575 2024-10-30)
binary: rustc
commit-hash: 1203575
commit-date: 2024-10-30
host: x86_64-unknown-linux-gnu
release: 1.84.0-nightly
LLVM version: 19.1.1

an example:

#![feature(autodiff)] use std::autodiff::autodiff; fn main() { #[autodiff(d_inner, Forward, Dual, DualOnly)] fn inner(x: f32) -> f32 { x * x } }

build results in the error message (with the first line with the path manually removed)

error: autodiff must be applied to function --> src/main.rs:6:5 | 6 | / fn inner(x: f32) -> f32 { 7 | | x * x 8 | | } | |_____^ error: could not compile `enzyme-test` (bin "enzyme-test") due to 1 previous error