syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     //                                    V                 V
context_before:     //               :                    |                 |
context_after:     // [drop[n]] -...-> [drop[1]] ------> [drop[0]] ------> [last_unwind_to]