syntax_data: {"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     ///     (true , _    , true ) => true,  // (0)
context_before:     /// match (x, y, z) {
context_after:     ///     (false, false, _    ) => false, // (1)