[Issue 3286] New: Default parameter prevents solution of inter-module circular dependency

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3286

           Summary: Default parameter prevents solution of inter-module
                    circular dependency
           Product: D
           Version: 2.032
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: rejects-valid
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: hskwk at inter7.jp


module a;
import b;
import c;

class A {
    static __gshared A a;
    void f(B b) {}
    void g(C c) {} // <- Error: identifier 'C' is not defined
}

////////////
module b;
import a;
class B { void f(A x = A.a) {} }

////////////
module c;
import a;
class C { void f(A x = A.a) {} }



There is no problem if class A, B and C are in the same module.
So this dependency is valid and the error is specific for inter-module circular
dependency.

If default parameter "= A.a" for B.f is removed, it goes well.
There is no problem if A.a appeared in the body of B.f.

It seems that the compiler tries to recognize the semantics of default
parameter A.a when it is reading declaration of B.f.
Default parameters are usually hint for the expressions which call the
functions with default parameters, this behavior is inexplicable.


This error is a regression between 2.031 and 2.032.

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