https://issues.dlang.org/show_bug.cgi?id=19790

          Issue ID: 19790
           Summary: ICE dmd/dimport.d(168): Assertion failure
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: blocker
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: ibuclaw@gdcproject.org

Minimal test:

a/pkg/c.d
---
module a.pkg.c;
import b.mod;
---

a/pkg/package.d
---
// Empty module.
---

b/mod.d
---
module b.mod;
import a.pkg;
---

--