: By default, build dependencies are now built with opt-level = 0 to speed up compilation times.

Several new APIs were added to the stable standard library, including:

: A significant standard library change now allows traits like Debug , Default , and PartialEq to be implemented for arrays of any length , lifting the previous restriction of length 32 or less.

Many existing methods were made const , allowing them to be used in constant contexts: The new method for all NonZero integers.

Vec::leak : Allows "leaking" a vector to obtain a mutable reference that lives for the remainder of the program's life.

: The output of RUST_BACKTRACE was made more readable and compact. Stabilised Library APIs