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Suppose you have changes that turned out to be broken, but stuff that works
has been committed since. This can fix it:

svn merge -r 673:669 https://host/svn/project/trunk

669 is the version just before the broken stuff was committed and 673 is the start of stuff that works. So The change between revision 669 and 673 is reverted and applied.

don't forget to commit this.