Via IRC:
```
<epriestley> If you just do this, in a clean working copy:
<svemir> maybe due to svn version? we are on 1.7.4
<epriestley> echo asdf > new_file
<epriestley> svn add new_file
<epriestley> svn propset svn:executable '*' new_file
<epriestley> arc diff --only
<epriestley> ...does that show the file content?
<epriestley> I'm on 1.8.3, so it definitely could be a version issue.
<epriestley> Not showing file content for text files with svn:executable set definitely sounds like a bug on our side, though.
<epriestley> But I can't repro (at HEAD + 1.8.3, at least).
<svemir> it does not show the content in new_file in the diff in my case
<svemir> and this is not even in that messed up repo
```
This works fine at HEAD on 1.8.3, so it's likely a version problem:
https://secure.phabricator.com/differential/diff/24995/