syntax_data: {"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                         // __awaitee placeholder symbol which means a child future being `.await`ed.
context_before:                         // Include the type name if there is no field name, or if the name is the
context_after:                         type_name: (field_name.is_none() || field_name == Some(sym::__awaitee))