syntax_data: {"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"region::Scope"}]}
source_snippet:         region::Scope { local_id: body.id().hir_id.local_id, data: region::ScopeData::Arguments };
context_before:     let arg_scope =
context_after:     let source_info = builder.source_info(span);