LWG3781 The exposition-only alias templates cont-key-type and cont-mapped-type should be removed

Author: burblebee

source/containers.tex

@@ -13158,18 +13158,6 @@
 defined in \ref{associative.general}
 may appear in deduction guides for container adaptors.
 
-\pnum
-The following exposition-only alias templates may appear in deduction guides
-for container adaptors:
-\begin{codeblock}
-template<class Container>
-  using @\exposid{cont-key-type}@ =                                // \expos
-    remove_const_t<typename Container::value_type::first_type>;
-template<class Container>
-  using @\exposid{cont-mapped-type}@ =                             // \expos
-    typename Container::value_type::second_type;
-\end{codeblock}
-
 \rSec2[queue.syn]{Header \tcode{<queue>} synopsis}
 
 \indexheader{queue}