syntax_data: {"ast_node_type":"variable","tokens":[{"end":96,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let mut dropline: DenseBitSet<BasicBlock> = DenseBitSet::new_empty(body.basic_blocks.len());
context_before: fn gather_dropline_blocks<'tcx>(body: &mut Body<'tcx>) -> DenseBitSet<BasicBlock> {
context_after:     for (bb, data) in traversal::reverse_postorder(body) {