2546 – Array Ops silently fail when no slice symbol is used.

import std.stdio;
void main() {
 double[] foo = [1.0,2,3,4,5].dup;
 double[] bar = [6.0,7,8,9,10].dup;
 foo[] += bar; // foo now still == [1.0, 2.0, 3.0, 4.0, 5.0].
 writeln(foo);
 foo[] += bar[]; // Works.
 writeln(foo);
 uint[] intFoo = [1u,2,3,4,5].dup;
 uint[] intBar = [6u,7,8,9,10].dup;
 intFoo[] += intBar; // intFoo is now [6,7,8,9,10].
 writeln(intFoo);
 intFoo[] += intBar[];
 writeln(intFoo); // Works.
}
The compiler should either reject array ops in the form of foo[] += bar, or it should work. Either way, it should not fail silently with results that are arbitrary and inconsistent among types.

http://www.dsource.org/projects/dmd/changeset/509