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17 Correct version of some examples
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Some of the examples in this manuals are buggy or not very robust, for
demonstration purposes.  Improved versions of these composite macros are
presented here.

* Menu:

* Improved exch::               Solution for ‘exch’
* Improved forloop::            Solution for ‘forloop’
* Improved foreach::            Solution for ‘foreach’
* Improved copy::               Solution for ‘copy’
* Improved m4wrap::             Solution for ‘m4wrap’
* Improved cleardivert::        Solution for ‘cleardivert’
* Improved capitalize::         Solution for ‘capitalize’
* Improved fatal_error::        Solution for ‘fatal_error’