syntax_data: {"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: ///                                             // {a, b, c, d}
context_before: /// fn foo(pred: bool) {                        // maybe-uninit:
context_after: ///     let a = S; let mut b = S; let c; let d; // {      c, d}