{"ast_node_type":"variable","tokens":[{"end":78,"kind":"keyword","start":0,"text":"///"}]}
/// let _span = enter_trace_span!(M, borrow_tracker::on_stack_pop, /* ... */);
/// // for example, the first will expand to the second
/// let _span = enter_trace_span!(M, "borrow_tracker", borrow_tracker = "on_stack_pop", /* ... */);