syntax_data: {"ast_node_type":"variable","tokens":[{"end":55,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let one = Operand::Constant(Box::new(ConstOperand {
context_before:         local_decls.push(LocalDecl::with_source_info(tcx.types.usize, source_info)).into();
context_after:         span: source_info.span,