m4: Answers

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1 17 Correct version of some examples
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1 Some of the examples in this manuals are buggy or not very robust, for
1 demonstration purposes.  Improved versions of these composite macros are
1 presented here.
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· 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'
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