Mismatched types error when using ptr::null with *mut

[SSheldon]

The following code won't compile:

fn main() {
    let foo: *mut uint = std::ptr::null();
}

Instead, it fails with error: mismatched types: expected *mut uintbut found*const <generic #1> (values differ in mutability)

But it gets better, this also won't compile:

fn main() {
    let foo: *mut uint = std::ptr::null() as *mut uint;
}

That fails with error: cannot determine a type for this expression: unconstrained type [E0101].

To get it to compile, you need to do:

fn main() {
    let foo: *mut uint = std::ptr::null::<uint>() as *mut uint;
}

This wasn't previously necessary (at least as of 0.11.0).

I'm using rustc 0.12.0-pre-nightly (4d4eb1023 2014-08-02 23:36:09 +0000)

[SSheldon]

Huh I'm sorry, this seems related to the switch to *mut. I thought I was calling RawPtr::null but wasn't. Looks like I should be using mut_null instead. My bad!