doc/bugs/Exporting_subdirs_fails.mdwn

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+### Please describe the problem.
+git annex won't export subdirectories claiming they don't exist. `git rev-parse` however, returns a hash for said directories which then are accepted by `git annex export`.
+
+
+### What steps will reproduce the problem?
+
+[[!format sh """
+$ git annex export master:folder --to exp
+fatal: Path 'folder:' does not exist in 'master'
+git-annex: unknown tree
+$ git rev-parse master:folder
+943218c141ab2a315b533fa9f92fe610916b5d1b
+$ git annex export 943218c141ab2a315b533fa9f92fe610916b5d1b --to exp
+export exp testfile2 
+ok                          
+(recording state in git...)
+"""]]
+
+
+### What version of git-annex are you using? On what operating system?
+git-annex version: 6.20171026-g43d011a52 on Arch Linux
+