syntax_data: {"ast_node_type":"other","tokens":[{"end":20,"kind":"keyword","start":0,"text":"is_null,"}]}
source_snippet:             is_null,
context_before:         StatementKind::Assign(Box::new((
context_after:             Rvalue::BinaryOp(BinOp::Eq, Box::new((Operand::Copy(addr), zero))),