syntax_data: {"ast_node_type":"other","tokens":[{"end":7,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     ///
context_before:     /// the algorithm. For more details on why we lower like this, see [`Builder::test_candidates`].
context_after:     /// Note how we test `x` twice. This is the tradeoff of backtracking automata: we prefer smaller