{"ast_node_type":"variable","tokens":[{"end":75,"kind":"keyword","start":0,"text":"let"}]}
        let hir::LetExpr { pat, ty, span, init, recovered: _ } = *let_expr;
    fn from((let_expr, hir_id): (&'a hir::LetExpr<'a>, HirId)) -> Self {
        Declaration { hir_id, pat, ty, span, init: Some(init), origin: DeclOrigin::LetExpr }