{"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"//"}]}
    // Rows of len 1 are very common, which is why `SmallVec[_; 2]` works well.
struct PatStack<'p, Cx: PatCx> {
    pats: SmallVec<[PatOrWild<'p, Cx>; 2]>,