syntax_data: {"ast_node_type":"variable","tokens":[{"end":78,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let poison_block = body.basic_blocks_mut().push(BasicBlockData::new_stmts(
context_before:     let source_info = SourceInfo::outermost(body.span);
context_after:         vec![transform.set_discr(VariantIdx::new(CoroutineArgs::POISONED), source_info)],