syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                         // Currently just ignored
context_before:                         // FIXME: sync drop of coroutine with async drop (generate both versions?)
context_after:                         if tcx.optimized_mir(coroutine_def_id).coroutine_drop_async().is_some() {