I have pushed this several times in the past, but there's always been a lot of resistance to the idea. Though I've always phrased it as "let's allow the safety checks to be turned off", which isn't necessarily the best phrasing...

I wonder if it'd be better to just push to make unsafe easier to use: add sugar for ptr::offset, add a -> operator, relax the restrictions on casts, and so on. When I do OpenGL programming in Rust I drop into unsafe quite regularly, and it feels just like C, except for some annoying papercuts. It'd be nice to get rid of those papercuts.