{"ast_node_type":"function","tokens":[{"end":39,"kind":"keyword","start":0,"text":"fn"}]}
fn compute_unsafe_infer_vars<'a, 'tcx>(
/// `compute_unsafe_infer_vars` will return `{ id(?X) -> (hir_id, span, Call) }`
    fcx: &'a FnCtxt<'a, 'tcx>,