syntax_data: {"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let context_mut_ref = transform_async_context(tcx, body);
context_before:         ) {
context_after:             expand_async_drops(tcx, body, context_mut_ref, coroutine_kind, coroutine_ty);