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C multi line macro: do/while(0) vs scope block

http://docs.google.com/View?docid=ajbgz6fp3pjh_2dwwwwt#_38239340844832237
It is not about optimization.
The whole idea of using 'do/while' version
is to make a macro which will
expand into a regular statement, not into a
compound statement. This is
done in order to make the use of function-s ......

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