syntax_data: {"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // It will always be `()` in this case.
context_before:         // The resume argument may be missing, in that case we need to provide it here.
context_after:         if tcx.is_coroutine(owner_def.to_def_id()) && body.params.is_empty() {