fix: Fix allocator for modern Rust (uncomplete)

See rust-lang/rfcs#1974

src/alloc/Cargo.toml

@@ -13,3 +13,4 @@ test = false
 
 [dependencies]
 core = { path= "../../../libcore" }
+alloc = { path = "../../../liballoc" }

src/alloc/alloc.rs

@@ -1,18 +1,21 @@
 //! Kernel Mode Allocator
 
-// The compiler needs to be instructed that this crate is an allocator in order
-// to realize that when this is linked in another allocator like jemalloc should
-// not be linked in
-#![feature(allocator)]
-#![allocator]
+#![crate_name = "alloc_system"]
+#![crate_type = "rlib"]
 
 // Allocators are not allowed to depend on the standard library which in turn
 // requires an allocator in order to avoid circular dependencies. This crate,
 // however, can use all of libcore.
 #![no_std]
 
-#![crate_name = "alloc_system"]
-#![crate_type = "rlib"]
+// The compiler needs to be instructed that this crate is an allocator in order
+// to realize that when this is linked in another allocator like jemalloc should
+// not be linked in
+#![feature(global_allocator)]
+#![feature(default_lib_allocator)]
+//#![allocator]
+
+
 
 mod pool;