[Issue 21148] New: Semaphoreci: core.exception.AssertError at std/file.d(1929): unittest failure

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21148

          Issue ID: 21148
           Summary: Semaphoreci:
                    core.exception.AssertError at std/file.d(1929): unittest
                    failure
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: bugzilla at digitalmars.com

This randomly pops up when running semaphoreci.

The log file says:

---------
****** FAIL debug64 std.file
core.exception.AssertError at std/file.d(1929): unittest failure
---------

Looking at std/file.d it's clearly a timing issue:

----
@system unittest
{
    import core.thread;

    if (exists(deleteme))
        remove(deleteme);

    SysTime lastTime;
    foreach (n; 0 .. 3)
    {
        write(deleteme, "a");
        auto time = timeLastModified(deleteme);
        remove(deleteme);
        assert(time != lastTime);
        lastTime = time;
        Thread.sleep(10.msecs);
    }
}
-----

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