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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.

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'