LWG4140 Useless default constructors for bit reference types

[template.bitset.general] [vector.bool.pspc] bitset already removed.

Author: burblebee

source/containers.tex

@@ -9258,8 +9258,6 @@
 
     // bit reference
     class @\libmember{reference}{vector<bool>}@ {
-      constexpr reference() noexcept;
-
     public:
       constexpr reference(const reference&) = default;
       constexpr ~reference();

source/utilities.tex

@@ -9808,8 +9808,6 @@
   public:
     // bit reference
     class reference {
-      constexpr reference() noexcept;
-
     public:
       constexpr reference(const reference&) = default;
       constexpr ~reference();