syntax_data: {"ast_node_type":"other","tokens":[{"end":26,"kind":"keyword","start":0,"text":"BinOp::Lt,"}]}
source_snippet:                 BinOp::Lt,
context_before:             Rvalue::BinaryOp(
context_after:                 Box::new((Operand::Copy(Place::from(index)), len.to_copy())),