syntax_data: {"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                         // This can match both if $actual_len = test_len >= pat_len,
context_before:                     (Ordering::Equal | Ordering::Greater, true) => {
context_after:                         // and if $actual_len > test_len. We can't advance.