syntax_data: {"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"fn_def_id.map(|fn_def_id|"}]}
source_snippet:                 fn_def_id.map(|fn_def_id| tcx.deduced_param_attrs(fn_def_id)).unwrap_or_default()
context_before:             if tcx.sess.opts.optimize != OptLevel::No && tcx.sess.opts.incremental.is_none() {
context_after:             } else {