problem with std.range.choose()

[Johannes Loher via Digitalmars-d-learn]

Hello, I have a problem with using std.range.choose():

When using std.range.choose() on a range R, for which 
hasElaborateCopyConstructor!R is true, then a postblit for the 
result of std.range.choose() is created, which includes a call to 
R.__postblit(). However, hasElaborateCopyConstructor!R may be 
true, even if R does not define this(this), for example in the 
case that one of the members of R does so.

The example that I encountered (reduced to a minimum) was the the 
following:

import std.stdio : stdin;
import std.range: choose;

void main()
{
     ubyte[1][] secondRange;
     choose(true, stdin.byChunk(1), secondRange);
}

In this case File defines this(this), but ByChunk does not, so 
the above code does not compile.

I think what std.range.choose() does here is completely 
unnecessary: When the result of std.range.choose() gets copied, 
the underyling range gets copied, and if it implements postblit, 
it is automatically called. No need to call it explicitly, right?.