[Issue 3755] New: Regression forward declaration templates something

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3755

           Summary: Regression forward declaration templates something
           Product: D
           Version: 1.056
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: borislav.asdf at gmail.com


--- Comment #0 from borislav.asdf at gmail.com 2010-01-30 06:15:21 PST ---
It used to work in 1.055 now it says

bug.d(6): Error: declaration _D3bug1A6__initZ forward declaration
bug.d(34): Error: template instance bug.Tuple!(_D3bug1A6__initZ) error
instantiating
bug.d(38):        instantiated from here: InitsOf!(A)
bug.d(54):        instantiated from here: MinArgs!(func)


//////////////////////////
//////////////////////////
//////////////////////////

struct A {
}

//////////////////////////
//////////////////////////
//////////////////////////

template ParameterTupleOf( Fn )
{
    static if( is( Fn Params == function ) )
        alias Params ParameterTupleOf;
    else static if( is( Fn Params == delegate ) )
        alias ParameterTupleOf!(Params) ParameterTupleOf;
    else static if( is( Fn Params == Params* ) )
        alias ParameterTupleOf!(Params) ParameterTupleOf;
    else
        static assert( false, "Argument has no parameters." );
}

template Tuple( TList... )
{
    alias TList Tuple;
}

template InitsOf(T...) {
    static if(T.length == 0)
        alias Tuple!() InitsOf;
    else
        alias Tuple!(T[0].init, InitsOf!(T[1 .. $])) InitsOf;
}

template MinArgs(alias func) {
    const uint MinArgs = MinArgsImpl!(func, 0,
InitsOf!(ParameterTupleOf!(typeof(&func))));
}

private template MinArgsImpl(alias func, int index, Args...) {
    static if(index >= Args.length)
        const uint MinArgsImpl = Args.length;
    else static if(is(typeof(func(Args[0 .. index]))))
        const uint MinArgsImpl = index;
    else
        const uint MinArgsImpl = MinArgsImpl!(func, index + 1, Args);
}    

void func(A) {
}

void main() {
    const a = MinArgs!(func);
}

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