fn autodiff_attrs(tcx: TyCtxt<'_>, id: DefId) -> Option<AutoDiffAttrs>Expand description
We now check the #[rustc_autodiff] attributes which we generated from the #[autodiff(…)] macros. There are two forms. The pure one without args to mark primal functions (the functions being differentiated). The other form is #[rustc_autodiff(Mode, ActivityList)] on top of the placeholder functions. We wrote the rustc_autodiff attributes ourself, so this should never panic, unless we introduced a bug when parsing the autodiff macro.