Summary: Annoying Forward Reference Error When Compiling
                    Multiple Files
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD

--- Comment #0 from David Simcha <> 2011-12-11 18:20:41 PST ---
// hash.d.  This is part of a library, not the application.  Therefore, it
// is in the import path but is not explicitly passed to DMD
struct HashRange(K, S, ) {
    size_t _length;

    this(S* set) {
        this._length = set.length;


struct StackSet(K) {

    HashRange!(K, typeof(this)) elems() {

    @property size_t length() {

// a.d.  This is part of the application.
import hash;

// b.d.  This is also part of the application.
import hash;

void fun() {
    StackSet!string alreadyDone;

$ dmd -c a.d b.d
hash.d(11): Error: struct hash.StackSet!(string).StackSet no size yet for
forward reference
hash.d(5): Error: cannot implicitly convert expression ((*set).length()) of
type size_t to ulong
hash.d(13): Error: template instance hash.HashRange!(string,StackSet!(string))
error instantiating
b.d(4):        instantiated from here: StackSet!(string)
b.d(4): Error: template instance hash.StackSet!(string) error instantiating

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