EricWF added a comment.

I really dislike this change. I'm afraid that these changes allow the tests to 
silently fail for reasons other than `test.dat` being read only.  For example 
if `test.dat` ever gets deleted, or if libc++'s remote test-harness fails to 
copy the input file to the remote host.

I'm not sure how to work around your read-only VCS issue though... Do you have 
any other ideas?


https://reviews.llvm.org/D26814



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