PATCH to implement `restrict' in C

[Joe Buck]

> The newest Microsoft Visual C++ (6.0) seems to have a new construct
> `__assume(expr)'.  What they recommend is to replace `assert' in with
> `__assume(expr)' in non-debug build.

Ah, but they could have done this without asking people to change their
code: 'assert' would expand to __assume if NDEBUG is defined.  It isn't
necessary to invent a new user-level construct.