LWG3546 common_iterator's postfix-proxy is not quite right

Author: jensmaurer

source/iterators.tex

@@ -5008,8 +5008,8 @@
 Otherwise, if
 \tcode{requires (I\& i) \{ \{ *i++ \} -> \exposconceptnc{can-reference}; \}}
 is \tcode{true} or
-\tcode{\libconceptx{constructible_\newline{}from}{constructible_from}<iter_value_t<I>, iter_reference_t<I>>}
-is \tcode{false},
+\tcode{\libconceptx{constructible_\newline{}from}{constructible_from}<iter_value_t<I>, iter_reference_t<I>> \&\& \libconcept{move_constructible}<iter_value_t<I>>}
+is \linebreak \tcode{false},
 equivalent to:
 \begin{codeblock}
 return get<I>(v_)++;
@@ -5025,7 +5025,7 @@
 class @\exposid{postfix-proxy}@ {
   iter_value_t<I> keep_;
   @\exposid{postfix-proxy}@(iter_reference_t<I>&& x)
-    : keep_(std::move(x)) {}
+    : keep_(std::forward<iter_reference_t<I>>(x)) {}
 public:
   const iter_value_t<I>& operator*() const {
     return keep_;