import std.stdio;

struct Test {
	int count;
	
	this( int x )                { count = x; }
	this( this )                 { writeln("Postblit!"); }
	
	typeof(this)   opSlice()     { return this; }
	int            front() const { return 42; }
	@property bool empty() const { return count == 0; }
	void           popFront()    { --count; }
	
}

int main(string[] argv) {
	auto v = Test(5);
	
	foreach( x ; v )
		writeln( x );
	writeln( "Count: ", v.count );
	return 0;
}

In the code above "Postblit!" doesn't get written, but a copy of v is definitely created since "Count: 5" gets printed. It seems that foreach() calls opSlice and for some reason the returned object gets blitted without calling the postblit ctor (maybe a misguided return value optimization?).
Removing the opSlice() definition results in correct behaviour.