[Issue 16659] Clarify mutating while iterating rules

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16659

greensunn...@gmail.com changed:

           What    |Removed                     |Added
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           Assignee|alexandru.razva...@gmail.co |greensunn...@gmail.com
                   |m                           |

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