syntax_data: {"ast_node_type":"variable","tokens":[{"end":57,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let unwind_drops = &mut self.scopes.unwind_drops;
context_before:         let resume_block = &mut None;
context_after:         Self::build_unwind_tree(cfg, unwind_drops, fn_span, resume_block);