syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // and this is the only location creating `SyntheticCoroutineBody`.
context_before:     // This path is unique since we're in a query so we'll only be called once with `parent_def_id`
context_after:     let body_def = tcx.create_def(