In file t2.d:

struct s {
  uint  v;
  uint  x;
}

char[][s] h1;

int main()
{
  s S;
  h1[S] = "hello";
  return( 0 );
}

gives the following when being built

[c:\test]dmd t2.d
C:\dmd\bin\..\..\dm\bin\link.exe t2,,,user32+kernel32/noi;
OPTLINK (R) for Win32  Release 7.50B1
Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved

t2.obj(t2)
 Error 42: Symbol Undefined __init_TypeInfo_S4t2_s
--- errorlevel 1

Steve Adams wrote:
> In file t2.d:
> 
> struct s {
>   uint  v;
>   uint  x;
> }
> 
> char[][s] h1;
> 
> gives the following when being built
> 
>  Error 42: Symbol Undefined __init_TypeInfo_S4t2_s

This is due to limitations in the TypeInfo model used in DMD.  It'll be amended in the future.