[RFC PATCH 1/2] Add a scoped warning disabler.

[John W. Eaton]

On  6-Dec-2007, Jason Riedy wrote:

| Linking the warning enabled status to the scope helps with exceptions.
| Use a struct rather than a class just to avoid dumping the common init
| symbol into the global environment.

Any change like this will have to wait until after 3.0.

Can you please explain what this does/how it is used?

jwe