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@puremagic.com
        ReportedBy: borislav.asdf@gmail.com


--- Comment #0 from borislav.asdf@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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borislav.asdf@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |regression


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Don <clugdbug@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|1.056                       |D1
            Summary|Regression forward          |Forward declaration
                   |declaration templates       |templates something (D1
                   |something                   |only)
           Severity|regression                  |normal


--- Comment #1 from Don <clugdbug@yahoo.com.au> 2010-07-26 08:25:02 PDT ---
This is not a regression. The behaviour in 1.056 is the same as in 1.054. In
1.055, it didn't generate any error messages, but that was because the compiler
was crashing!
Interestingly the code works on 2.043 and later.

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