What is this error?!

[Mehrdad]

Trying to compile
    import std.stdio, std.cstream;
    alias file a;
gives
    [...]\windows\bin\..\..\src\phobos\std\stdio.d(257): Error: struct 
std.stdio.File conflicts with class std.stream.File at 
[...]\windows\bin\..\..\src\phobos\std\stream.d(1807)
    [...]\Temp2.d(2): Error: undefined identifier file, did you mean struct 
File?

IMHO the first error is a little silly...