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+[hidden.friends]
+
+# 16 Library introduction [[library]](./#library)
+
+## 16.4 Library-wide requirements [[requirements]](requirements#hidden.friends)
+
+### 16.4.6 Conforming implementations [[conforming]](conforming#hidden.friends)
+
+#### 16.4.6.6 Friend functions [hidden.friends]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L3709)
+
+Whenever this document specifies
+a friend declaration of a function or function template
+within a class or class template definition,
+that declaration shall be
+the only declaration of that function or function template
+provided by an implementation[.](#1.sentence-1)
+
+[*Note [1](#note-1)*:
+
+In particular,
+a conforming implementation does not provide
+any additional declarations of that function or function template
+at namespace scope[.](#1.sentence-2)
+
+â *end note*]
+
+[*Note [2](#note-2)*:
+
+Such a friend function or function template declaration
+is known as a hidden friend,
+as it is visible neither
+to ordinary unqualified lookup ([[basic.lookup.unqual]](basic.lookup.unqual "6.5.3 Unqualified name lookup")) nor
+to qualified lookup ([[basic.lookup.qual]](basic.lookup.qual "6.5.5 Qualified name lookup"))[.](#1.sentence-3)
+
+â *end note*]