diff --git a/source/utilities.tex b/source/utilities.tex
index 0a26e0266a..f864a3766c 100644
--- a/source/utilities.tex
+++ b/source/utilities.tex
@@ -4451,68 +4451,68 @@
 namespace std {
   template<class T>
   class optional<T&> {
-    public:
-      using value_type     = T;
-      using iterator       = @\impdefnc@;            // see~\ref{optional.ref.iterators}
+  public:
+    using value_type     = T;
+    using iterator       = @\impdefnc@;              // see~\ref{optional.ref.iterators}
 
-    public:
-      // \ref{optional.ref.ctor}, constructors
-      constexpr optional() noexcept = default;
-      constexpr optional(nullopt_t) noexcept : optional() {}
-      constexpr optional(const optional& rhs) noexcept = default;
-
-      template<class Arg>
-        constexpr explicit optional(in_place_t, Arg&& arg);
-      template<class U>
-        constexpr explicit(@\seebelow@) optional(U&& u) noexcept(@\seebelow@);
-      template<class U>
-        constexpr explicit(@\seebelow@) optional(optional<U>& rhs) noexcept(@\seebelow@);
-      template<class U>
-        constexpr explicit(@\seebelow@) optional(const optional<U>& rhs) noexcept(@\seebelow@);
-      template<class U>
-        constexpr explicit(@\seebelow@) optional(optional<U>&& rhs) noexcept(@\seebelow@);
-      template<class U>
-        constexpr explicit(@\seebelow@) optional(const optional<U>&& rhs) noexcept(@\seebelow@);
-
-      constexpr ~optional() = default;
-
-      // \ref{optional.ref.assign}, assignment
-      constexpr optional& operator=(nullopt_t) noexcept;
-      constexpr optional& operator=(const optional& rhs) noexcept = default;
-
-      template<class U> constexpr T& emplace(U&& u) noexcept(@\seebelow@);
-
-      // \ref{optional.ref.swap}, swap
-      constexpr void swap(optional& rhs) noexcept;
-
-      // \ref{optional.iterators}, iterator support
-      constexpr iterator begin() const noexcept;
-      constexpr iterator end() const noexcept;
-
-      // \ref{optional.ref.observe}, observers
-      constexpr T*       operator->() const noexcept;
-      constexpr T&       operator*() const noexcept;
-      constexpr explicit operator bool() const noexcept;
-      constexpr bool     has_value() const noexcept;
-      constexpr T&       value() const;                         // freestanding-deleted
-      template<class U = remove_cv_t<T>>
-        constexpr remove_cv_t<T> value_or(U&& u) const;
-
-      // \ref{optional.ref.monadic}, monadic operations
-      template<class F> constexpr auto and_then(F&& f) const;
-      template<class F> constexpr optional<invoke_result_t<F, T&>> transform(F&& f) const;
-      template<class F> constexpr optional or_else(F&& f) const;
-
-      // \ref{optional.ref.mod}, modifiers
-      constexpr void reset() noexcept;
-
-    private:
-      T* @\exposidnc{val}@ = nullptr;                                         // \expos
-
-      // \ref{optional.ref.expos}, exposition only helper functions
-      template<class U>
-        constexpr void @\exposidnc{convert-ref-init-val}@(U&& u);             // \expos
-    };
+  public:
+    // \ref{optional.ref.ctor}, constructors
+    constexpr optional() noexcept = default;
+    constexpr optional(nullopt_t) noexcept : optional() {}
+    constexpr optional(const optional& rhs) noexcept = default;
+
+    template<class Arg>
+      constexpr explicit optional(in_place_t, Arg&& arg);
+    template<class U>
+      constexpr explicit(@\seebelow@) optional(U&& u) noexcept(@\seebelow@);
+    template<class U>
+      constexpr explicit(@\seebelow@) optional(optional<U>& rhs) noexcept(@\seebelow@);
+    template<class U>
+      constexpr explicit(@\seebelow@) optional(const optional<U>& rhs) noexcept(@\seebelow@);
+    template<class U>
+      constexpr explicit(@\seebelow@) optional(optional<U>&& rhs) noexcept(@\seebelow@);
+    template<class U>
+      constexpr explicit(@\seebelow@) optional(const optional<U>&& rhs) noexcept(@\seebelow@);
+
+    constexpr ~optional() = default;
+
+    // \ref{optional.ref.assign}, assignment
+    constexpr optional& operator=(nullopt_t) noexcept;
+    constexpr optional& operator=(const optional& rhs) noexcept = default;
+
+    template<class U> constexpr T& emplace(U&& u) noexcept(@\seebelow@);
+
+    // \ref{optional.ref.swap}, swap
+    constexpr void swap(optional& rhs) noexcept;
+
+    // \ref{optional.iterators}, iterator support
+    constexpr iterator begin() const noexcept;
+    constexpr iterator end() const noexcept;
+
+    // \ref{optional.ref.observe}, observers
+    constexpr T*       operator->() const noexcept;
+    constexpr T&       operator*() const noexcept;
+    constexpr explicit operator bool() const noexcept;
+    constexpr bool     has_value() const noexcept;
+    constexpr T&       value() const;                           // freestanding-deleted
+    template<class U = remove_cv_t<T>>
+      constexpr remove_cv_t<T> value_or(U&& u) const;
+
+    // \ref{optional.ref.monadic}, monadic operations
+    template<class F> constexpr auto and_then(F&& f) const;
+    template<class F> constexpr optional<invoke_result_t<F, T&>> transform(F&& f) const;
+    template<class F> constexpr optional or_else(F&& f) const;
+
+    // \ref{optional.ref.mod}, modifiers
+    constexpr void reset() noexcept;
+
+  private:
+    T* @\exposidnc{val}@ = nullptr;                                           // \expos
+
+    // \ref{optional.ref.expos}, exposition only helper functions
+    template<class U>
+      constexpr void @\exposidnc{convert-ref-init-val}@(U&& u);               // \expos
+  };
 }
 \end{codeblock}