{"ast_node_type":"variable","tokens":[{"end":53,"kind":"keyword","start":0,"text":"let"}]}
    let expr = ctx.find_node_at_offset::<BinExpr>()?;
pub(crate) fn flip_binexpr(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
    let lhs = expr.lhs()?;