syntax_data: {"ast_node_type":"other","tokens":[{"end":42,"kind":"keyword","start":0,"text":"hir::BinOpKind::Add"}]}
source_snippet:         hir::BinOpKind::Add => BinOp::Add,
context_before:     match op {
context_after:         hir::BinOpKind::Sub => BinOp::Sub,