Unreliability of the build system

[Simon Peyton-Jones]

| What worries me the most is unreliability of the test suite. After
| getting 200 test failures mentioned in the previous mail, I ran the
| validation again and got only 3 failures. I ran one of the failed tests
| manually and it passed, leaving me with two known failures.

This has never happened to me.  I can't even guess why it might happen to you.

Simon