Forbidden file names?

[Brian]

Hello --

Apologies if this is answered somewhere in the documentation.
I was trying out the sample code on the dlang.org home page.

When I got to the "Sort an Array at Compile-Time" example, I 
saved it on my machine as sort.d. When I tried to build sort.d, 
the compile failed. But when I renamed sort.d to anything else 
(e.g., array.d), the compilation was fine.

I am wondering if this is expected.

Thanks! Terminal output below explaining the above.

~Brian

/home/brian/d $ cat sort.d
void main()
{
     import std.algorithm, std.conv, std.stdio;

     "Starting program".writeln;

     // Sort a constant declaration at Compile-Time
     enum a = [ 3, 1, 2, 4, 0 ];
     static immutable b = sort(a);

     // Print the result _during_ compilation
     pragma(msg, text("Finished compilation: ", b));
}
/home/brian/d $ dmd sort.d
sort.d(9): Error: function expected before `()`, not `module 
sort` of type `void`
sort.d(12):        while evaluating `pragma(msg, text(T...)(T 
args) if (T.length > 0)("Finished compilation: ", b))`
/home/brian/d $ mv sort.d array.d
/home/brian/d $ dmd array.d
Finished compilation: immutable(SortedRange!(int[], "a < b", 
SortedRangeOptions.assumeSorted))([0, 1, 2, 3, 4])