Sergei Zimmerman (xokdvium) I'm trying to move the data into arena, and something appears to be leaking. Any idea why? The assignment operator should clean up the existing value, right?

        attrs = AttrDefs{std::move(attrs), arena};
        if (inheritFromExprs)
            inheritFromExprs = std::make_unique<std::pmr::vector<Expr *>>(std::move(*inheritFromExprs), arena);
        dynamicAttrs = DynamicAttrDefs{std::move(dynamicAttrs), arena};

std::map move constructor (AttrDefs is std::map):

      /// Allocator-extended move constructor.
      map(map&& __m, const __type_identity_t<allocator_type>& __a)
      noexcept(is_nothrow_copy_constructible<_Compare>::value
	       && _Alloc_traits::_S_always_equal())
      : _M_t(std::move(__m._M_t), _Pair_alloc_type(__a)) { }