https://issues.dlang.org/show_bug.cgi?id=23634

          Issue ID: 23634
           Summary: Possible data race with runnable example tester
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P1
         Component: tools
          Assignee: nobody@puremagic.com
          Reporter: nick@geany.org

`bool hasFailed` is assigned inside a std.parallelism.parallel foreach loop.

Fix:
https://github.com/dlang/dlang.org/pull/3492

--