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The manuals for Camlp4
The original reference manual and the tutorial for Camlp4. This refers to the Camlp4 version shipped until O'Caml 3.09 (which is still separately available as "Camlp5"). The Camlp4 version in 3.10 was rewritten from scratch. However, many of the interfaces and concepts described in this manual are still applicable. An "appendix" to this manual is available in godi-gallium-docs, which is a copy of the wiki at http://brion.inria.fr/gallium, and these docs somehow describe the changes in the rewritten Camlp4.
