[Issue 9881] New: Indirect cyclic imports are not forbidden

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9881

           Summary: Indirect cyclic imports are not forbidden
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: accepts-invalid
          Severity: normal
          Priority: P2
         Component: druntime
        AssignedTo: nobody at puremagic.com
        ReportedBy: thecybershadow at gmail.com


--- Comment #0 from Vladimir Panteleev <thecybershadow at gmail.com> 2013-04-05 13:40:00 EEST ---
Consider a program with three files:
=== A.d ===
import B, C;
void main() {}
=== B.d ===
import A;
shared static this() {}
=== C.d ===
import A;
shared static this() {}

Illustrated:

+---+      +---+      +---+
|   | ---> |   | ---> |   |
| B |      | A |      | C |
|   | <--- |   | <--- |   |
+---+      +---+      +---+

B and C have static constructors.

This program is allowed to compile and run, even though there is a circular
dependency between B and C. In a practical case, it can result in a problem
when B accesses something initialized in C via something in A.

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