Bug in the spec or implementation?

[Steven Schveighoffer]

On Thu, 05 Aug 2010 14:45:18 -0400, simendsjo <simen.endsjo at pandavre.com>  
wrote:

> This is only tested on dmd 2.047 on win7.
>
> According to the spec at http://digitalmars.com/d/2.0/arrays.html:
> "Concatenation always creates a copy of its operands, even if one of the  
> operands is a 0 length array"
>
> But this doesn't seem like the case:
>
> 	auto a = [0];
> 	auto oldPtr = a.ptr;
> 	assert(a.length == 1);
> 	assert(a.capacity == 3);
> 	a ~= 1;
> 	assert(a.ptr != oldPtr); // Fails - Still the same array

Concatenation is this:

a ~ 1

appending is this:

a ~= 1

Two separate operations, two separate semantics.  It might not be easy to  
determine that from the spec, but I believe the spec is clear.

-Steve