syntax_data: {"ast_node_type":"other","tokens":[{"end":37,"kind":"keyword","start":0,"text":"traits::ImplSource::Param(..)"}]}
source_snippet:         traits::ImplSource::Param(..)
context_before:         }
context_after:         | traits::ImplSource::Builtin(BuiltinImplSource::TraitUpcasting { .. }, _) => None,