syntax_data: {"ast_node_type":"other","tokens":[{"end":33,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     ///     (true, _) => drop(r),
context_before:     ///     // Borrowck must not know we don't test `y.1` when `y.0` is `true`.
context_after:     ///     (false, _) => {}