[Issue 6652] foreach parameter with number range is always ref

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6652



--- Comment #4 from dawg at dawgfoto.de 2011-09-13 00:02:29 PDT ---
https://github.com/D-Programming-Language/dmd/pull/377

Foreach arguments behave like function arguments. Here they don't.
The variable can be optimized out, if no altering happens.
This will not happen in a debug build, where it is irrelevant in comparison to
every variable being accessed through the stack.

You can use ref, if you're having too expensive copies
foreach(ref const i; iter(0) .. iter(10)) as with every other foreach argument.

Most important it has an explicit rule, that one can alter the loop index
through using a ref index.
foreach(ref idx, v; [0, 1, 2, 3, 4, 5])
  idx += stride - 1;

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