{"ast_node_type":"variable","tokens":[{"end":50,"kind":"keyword","start":0,"text":"let"}]}
    let TyPat { kind, hir_id, span: _ } = pattern;
pub fn walk_ty_pat<'v, V: Visitor<'v>>(visitor: &mut V, pattern: &'v TyPat<'v>) -> V::Result {
    try_visit!(visitor.visit_id(*hir_id));