syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"Rvalue::Use(Operand::Constant(Box::new(ConstOperand"}]}
source_snippet:                     Rvalue::Use(Operand::Constant(Box::new(ConstOperand {
context_before:                     let yield_ty = args.type_at(0);
context_after:                         span: source_info.span,