Single file merge in Subversion

Question

I\'m using Subversion 1.5 and have a single file in a branch that I want to merge into another branch. When I do a svn merge http://path/to/file I get an error,

Answer 1

Im am using subversion 1.8.8 and

svn merge ^/trunk/path_to_file ./branch/path_to_local_file

works fine for me.