{"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"impl<T1:"}]}
impl<T1: HashStable<CTX>, T2: HashStable<CTX>, CTX> HashStable<CTX> for (T1, T2) {
    fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher) {