syntax_data: {"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // Invert the `is_flipped` flag for the contents of this `!`.
context_before:             ExprKind::Unary { op: UnOp::Not, arg } => {
context_after:                 let not_info = NotInfo { is_flipped: !not_info.is_flipped, ..not_info };