Robert Ramey wrote:

hp acc - has recently started to pass when a user sent me a patch to the test header. The current failures suggest something amiss with the testing environment.

It looks like some intermittent I/O problem: the compiler could not open STL include files. A test would pass, the next would fail with "cannot open source file..." error and so on. It all happened during serialization library tests run, some 450 tests. By the time this library tests were complete, the problem went away. I restarted the tests, we'll see tomorrow. In any case, as Robert Ramey stated, this is an environmental problem. Boris