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cppdraft/alt/headers.md

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+[alt.headers]
+
+# 16 Library introduction [[library]](./#library)
+
+## 16.4 Library-wide requirements [[requirements]](requirements#alt.headers)
+
+### 16.4.5 Constraints on programs [[constraints]](constraints#alt.headers)
+
+#### 16.4.5.4 Headers [alt.headers]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/lib-intro.tex#L3384)
+
+If a file with a name
+equivalent to the derived file name for one of the C++ standard library headers
+is not provided as part of the implementation, and a file with that name
+is placed in any of the standard places for a source file to be [included](cpp.include "15.3 Source file inclusion [cpp.include]"),
+the behavior is undefined[.](#1.sentence-1)