[Issue 15777] New: Premature expansion of overload set in tuples

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15777

          Issue ID: 15777
           Summary: Premature expansion of overload set in tuples
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: thecybershadow at gmail.com

/////////////////////// a.d //////////////////////
void fun() {}
/////////////////////// b.d //////////////////////
void fun() {}
///////////////////// test.d /////////////////////
alias AliasSeq(X...) = X;

template funA()
{
    import a;
    alias funA = fun;
}

template funB()
{
    import b;
    alias funB = fun;
}

template funAB()
{
    import a;
    import b;
    alias funAB = fun;
}

void test(alias tpl)()
{
    alias seq = AliasSeq!(tpl!());
    foreach (i, n; seq)
        pragma(msg, __traits(identifier, seq[i]));
}

void main()
{
    test!funA;
    test!funB;
    test!funAB;
}
//////////////////////////////////////////////////

The AliasSeq iteration works when seq is a single function, but when it's an
overload set, you get an error:

test.d(25): Error: variable test.test!(funAB).test.n variables cannot be of
type void
test.d(25): Error: b.fun at b.d(1) conflicts with a.fun at a.d(1)
test.d(25): Error: expression fun() is void and has no value
fun
test.d(33): Error: template instance test.test!(funAB) error instantiating

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