{"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"///"}]}
/// real [tracing::span::EnteredSpan] in case tracing is enabled, or the dummy type `()` when
/// A marker trait returned by [crate::interpret::Machine::enter_trace_span], identifying either a
/// tracing is disabled. Also see [crate::enter_trace_span!] below.