D input: how-to (RFC)

[Tyro[a.c.edwards]]

I am looking for a D version of scanf() but I'm sure there is no such 
thing so I tried contrived one. I am sure I missed a slew of obvious 
things and that this cannot be used for much more than a little toy on 
my personal computer. I would like to make it usable for others so I am 
asking for some guidance/suggestions for making it better.

Thanks,
Andrew

This is written in D2 v2.029 with an updated std.random to fix a problem 
I was having with the current release.

module ace.io;

private import std.conv: to, ConvError;
private import std.string: split, stripr;

public import std.stdio;

int read(/+File inFile = stdin,+/ A...)(out A a) /+Uncommenting results
     in: Error: arithmetic/string type expected for value-parameter, not
     File+/
{  start:
    auto data = stripr(readln());
    auto input = split(data);

    string assign()
    {
        return
        `  try {
               		if(a.length != input.length)
           					return -1;
               		a[i] = to!(typeof(t))(input[i]);
               } catch (ConvError e) {
               	  writeln("Invalid input!");
               	  goto start;
               }`;
    }

    foreach(i, t; a)
    {
      static if(is(typeof(t) == void))
        {}
      else static if(is(typeof(t) == bool))
        {}
      else static if(is(typeof(t) == byte))
        mixin(assign);
      else static if(is(typeof(t) == ubyte))
        mixin(assign);
      else static if(is(typeof(t) == short))
        mixin(assign);
      else static if(is(typeof(t) == ushort))
        mixin(assign);
      else static if(is(typeof(t) == int))
        mixin(assign);
      else static if(is(typeof(t) == uint))
        mixin(assign);
      else static if(is(typeof(t) == long))
        mixin(assign);
      else static if(is(typeof(t) == ulong))
        mixin(assign);
      /+static if(is(typeof(t) == cent))
        mixin(assign);
      static if(is(typeof(t) == ucent))
        mixin(assign);+/
      else static if(is(typeof(t) == float))
        mixin(assign);
      else static if(is(typeof(t) == double))
        mixin(assign);
      else static if(is(typeof(t) == real))
        mixin(assign);
      else static if(is(typeof(t) == ifloat))
        a[i] = ifloat.max;
      else static if(is(typeof(t) == idouble))
        a[i] = idouble.max;
      else static if(is(typeof(t) == ireal))
        a[i] = ireal.max;
      else static if(is(typeof(t) == cfloat))
        a[i] = cfloat.max;
      else static if(is(typeof(t) == cdouble))
        a[i] = cdouble.max;
      else static if(is(typeof(t) == creal))
        a[i] = creal.max;
      else static if(is(typeof(t) == char))
        a[i] = input[i][0];
      else static if(is(typeof(t) == wchar))
        mixin(assign);
      else static if(is(typeof(t) == dchar))
        a[i] = input[i][0];
      else static if(is(typeof(t) == string))
        if(a.length > 1)
          a[i] = input[i];
        else
          a[i] = data;
      else static if(is(typeof(t) == dstring))
        {}
      else static if(is(typeof(t) == char[]))
        a[i] = stripr(data).dup;
    }
    return 0;
}