syntax_data: {"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"Operand::Constant(Box::new(ConstOperand"}]}
source_snippet:                 Operand::Constant(Box::new(ConstOperand {
context_before:                 let yield_ty = args.type_at(0);
context_after:                     span: source_info.span,