Bug 12096 – Allow "body" to be used as an identifier

copying from PR: https://github.com/D-Programming-Language/dmd/pull/3227 Just recently a user wanted to use `body` as a member in his HTML document class: http://forum.dlang.org/thread/[email protected] I believe I've seen similar discussions several times in the forums. Someone suggested to only treat `body` as a keyword where it makes sense. I tried implementing that, and, while not exactly beautiful, it turned out to be surprisingly non-invasive. It's not a keyword at all anymore, but a special identifier. This same technique is also used for e.g. `scope(success)` among others, and could potentially be applied to other keywords too, but I guess `body` is the one with the greatest potential of conflict, because there is no nice alternative word (apart from capitalization and appending underscores etc.), and it's not a keyword in C/C++, so is freely used in some libraries. See also this enhancement request, which proposes a different solution to the same problem: http://d.puremagic.com/issues/show_bug.cgi?id=5775

Andrej Mitrovic suggests to improve the error messages instead: void main() { int body; } test.d(5): Error: Cannot use keyword 'body' as a symbol name. Try to use `body_` instead. It seems an acceptable solution.

In hindsight, the choice of 'body' for the keyword is unfortunate. But fixing it would cause even worse problems, so I think we're stuck with it.

Seems like Andrei & Walter have come to the conclusion that we won't fix this. Closing. https://github.com/D-Programming-Language/dmd/pull/3227