{"ast_node_type":"other","tokens":[{"end":42,"kind":"keyword","start":0,"text":"//"}]}
        // computes and caches its result.
        // which we are going to steal below. Thus we need to run `mir_for_ctfe` first, so it
        Some(hir::ConstContext::ConstFn) => tcx.ensure_done().mir_for_ctfe(did),