Strange problem with structure

[Zarathustra]

I have got following part of code:
[code_code_code_code_code_code_code]
module basis;
import std.stdio;
import std.math;
import std.string; 
import std.process;

struct SCoordinate{
  int max;
  int min;
}

[code_code_code_code_code_code_code]
and following errors:
OPTLINK (R) for Win32  Release 8.00.1
Copyright (C) Digital Mars 1989-2004  All rights reserved.
source\hiddenLine.obj(hiddenLine) 
 Error 42: Symbol Undefined _D5basis11SCoordinate3maxMFZl
source\hiddenLine.obj(hiddenLine) 
 Error 42: Symbol Undefined _D5basis11SCoordinate3minMFZl

It looks like linker treats min and max like external symbols, but why?