LWG4119 generator::promise_type::yield_value(ranges::elements_of<R, Alloc>)'s nested generator may be ill-formed

Author: burblebee

source/ranges.tex

@@ -17175,7 +17175,7 @@
 Equivalent to:
 \begin{codeblock}
 auto nested = [](allocator_arg_t, Alloc, ranges::iterator_t<R> i, ranges::sentinel_t<R> s)
-  -> generator<yielded, ranges::range_value_t<R>, Alloc> {
+  -> generator<yielded, void, Alloc> {
     for (; i != s; ++i) {
       co_yield static_cast<yielded>(*i);
     }