posted by Ryan Culpepper

Racket version 6.5 is now available from http://racket-lang.org/

Typed Racket and the racket/contract library generate code with lower overhead, speeding up typed/untyped interaction in a number of gradual typing programs we studied.

Macros written using syntax-parse automatically emit more accurate error messages.

The contract profiler captures costs from more contract combinators, including all those in the main distribution.

Hash table and set iteration, via both existing and new non-generic sequences, performs better, up to twice as fast on microbenchmarks.

The Racket optimizer detects many more optimization opportunities, including when variables always hold numbers.

The db library supports single-result CALL statements in MySQL.

The net/dns library supports SRV records.