std.math conflicts with std.mathspecial

[Jun]

import std.math;
import std.mathspecial; import std.stdio; void main(string[] 
args) {
  writeln(erf(0.5));
}
Well... I was wating for any reply about this but I got nothing.. 
so I decided to re-post this. If I compile this code, I get this 
message. D:\D\dmd2\windows\bin\mathconflict.d(7): Error: 
std.mathspecial.erf at D:\D\dmd2 
\windows\bin\..\..\src\phobos\std\mathspecial.d(273) conflicts 
with std.math.erf at 
D:\D\dmd2\windows\bin\..\..\src\phobos\std\math.d(1923) and if I 
try using deprecated one...
import std.math;
import std.stdio; void main(string[] args) {
   writeln(erf(0.5)); }  I get this. 
D:\D\dmd2\windows\bin\mathconflict.d(6): Error: function 
std.math.erf is deprecated
I think deprecated function should not cause conflict.