Broken crate using rust 1.6

[MagaTailor]

Due to this issue the crate no longer compiles:

Compiling sdl2_image v0.6.0
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/sdl2_image-0.6.0/src/sdl2_image/lib.rs:73:37: 73:95 error: mismatched types:
 expected `*const i8`,
    found `*const u8`
(expected i8,
    found u8) [E0308]
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/sdl2_image-0.6.0/src/sdl2_image/lib.rs:73             let raw = ffi::IMG_Load(CString::new(filename.to_str().unwrap()).unwrap().as_ptr());
                                                                                                                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/sdl2_image-0.6.0/src/sdl2_image/lib.rs:73:37: 73:95 help: run `rustc --explain E0308` to see a detailed explanation
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/sdl2_image-0.6.0/src/sdl2_image/lib.rs:99:55: 99:113 error: mismatched types:
 expected `*const i8`,
    found `*const u8`
(expected i8,
    found u8) [E0308]
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/sdl2_image-0.6.0/src/sdl2_image/lib.rs:99             let status = ffi::IMG_SavePNG(self.raw(), CString::new(filename.to_str().unwrap()).unwrap().as_ptr());
                                                                                                                                                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/sdl2_image-0.6.0/src/sdl2_image/lib.rs:99:55: 99:113 help: run `rustc --explain E0308` to see a detailed explanation
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/sdl2_image-0.6.0/src/sdl2_image/lib.rs:131:56: 131:114 error: mismatched types:
 expected `*const i8`,
    found `*const u8`
(expected i8,
    found u8) [E0308]
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/sdl2_image-0.6.0/src/sdl2_image/lib.rs:131             let raw = ffi::IMG_LoadTexture(self.raw(), CString::new(filename.to_str().unwrap()).unwrap().as_ptr());
                                                                                                                                                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/sdl2_image-0.6.0/src/sdl2_image/lib.rs:131:56: 131:114 help: run `rustc --explain E0308` to see a detailed explanation
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/sdl2_image-0.6.0/src/sdl2_image/lib.rs:218:50: 218:98 error: mismatched types:
 expected `*const i8`,
    found `*const u8`
(expected i8,
    found u8) [E0308]
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/sdl2_image-0.6.0/src/sdl2_image/lib.rs:218             ffi::IMG_LoadTyped_RW(self.raw(), 0, CString::new(_type.as_bytes()).unwrap().as_ptr())
                                                                                                                                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/sdl2_image-0.6.0/src/sdl2_image/lib.rs:218:50: 218:98 help: run `rustc --explain E0308` to see a detailed explanation
error: aborting due to 4 previous errors

A mechanical cast as *const _ seems to be enough of a fix in most cases.
Rust 1.5 is still fine.

[babariviere]

Does it work for rust 1.6 now?

[MagaTailor]

Fixed in fe4ce58