svn diff: Compare my local uncommited changes with an arbitrary version of the file from the repository

To see how your working copy's modifications to the file hello.c compare against revision 7 use:

svn diff -r 7 hello.c

According to: http://svnbook.red-bean.com/en/1.0/re09.html

--revision N The client compares TARGET@N against working copy.

So it would be

svn diff -r 7 hello.c

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