Compilation depends on class methods order

[kdmult]

Hi,

Why compilation depends on order of method declarations?

The following test case does not compile.

However, if we change the order of the 'read' methods in class 
InputStream below then  compilation will not fail.

Is it a bug?

---
module test;

import std.traits : isBasicType;
import std.typetuple : TypeTuple;

class InputStream {

     long read( ubyte* bytes, long len )
     {
         return 0;
     }

     void read(T)( ref T val ) if (isBasicType!T)
     {
         read(cast(ubyte*)&val, cast(long)val.sizeof);
     }

}

void main()
{
     auto input = new InputStream;

     foreach (T; TypeTuple!(long, int, short, byte))
     {
         T v;
         input.read(v);
     }
}
---

Thanks.