syntax_data: {"ast_node_type":"import","tokens":[{"end":55,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // so that we can use it should a destructor panic.
context_before:     // As we unwind the scope, we will also move `unwind_to` backwards to match,
context_after:     let mut unwind_to = unwind_to;