core::alloc::Alloc no longer exists in rust nightly. It is replaced by AllocRef.

[yima77]

Now, dlmalloc build fails with:

error[E0432]: unresolved import core::alloc::Alloc
--> /home/xyz/.cargo/registry/src/github.conef.uk-1ecc6299db9ec823/dlmalloc-0.1.3/src/lib.rs:21:19
|
21 | use core::alloc::{Alloc, Layout, AllocErr};
| ^^^^^ no Alloc in alloc

[TimDiekmann]

The AllocRef trait is currently highly unstable and in the next weeks you can expect quite a few changes. I will probably make a PR when #38, #41, and #42 at the allocator wg are merged.

[TimDiekmann]

Depending on how fast we move forward, this will be fixed with rust-lang/wg-allocators#21 (impl<T: GlobalAlloc> AllocRef for T).