{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"///"}]}
/// and otherwise accepts the same syntax as [tracing::span!] (see some tips below).
/// This macro takes a type implementing the [crate::interpret::Machine] trait as its first argument
/// Note: the result of this macro **must be used** because the span is exited when it's dropped.