{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"ProcMacroExpansionError::System(text)"}]}
                        ProcMacroExpansionError::System(text)
                        // Don't discard the item in case something unexpected happened while expanding attributes
                            if proc_macro.kind == ProcMacroKind::Attr =>