https://issues.dlang.org/show_bug.cgi?id=21614

          Issue ID: 21614
           Summary: compiled imports:
                    core.exception.AssertError@src/dmd/semantic3.d(812):
                    Assertion failure
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: ibuclaw@gdcproject.org

Occurs when compiling with `-i` and semantic errors have occurred in non-root modules.

Reduced test incoming.

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