syntax_data: {"ast_node_type":"variable","tokens":[{"end":83,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let basic_blocks: IndexVec<BasicBlock, BasicBlockData<'tcx>> = IndexVec::new();
context_before:     let _ = body.coroutine.take();
context_after:     body.basic_blocks = BasicBlocks::new(basic_blocks);