syntax_data: {"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let offset = self.parse_operand(args[1])?;
context_before:                 let ptr = self.parse_operand(args[0])?;
context_after:                 Ok(Rvalue::BinaryOp(BinOp::Offset, Box::new((ptr, offset))))