Local allocators are also in the works for Rust, as well as a general effect system (including potentially an IO effect). Rust also doesn't have fully general

Local allocators are also in the works for Rust, as well as a general effect system (including potentially an IO effect). Rust also doesn't have fully general operator overloading, it currently uses traits instead. (Though explicit local notations are generally a better way of handling operator semantics, and a future edition of Rust could potentially achieve this via macros.)