Ela changes
Documentation changes
Library changes

Ela changes

Platform 2013.2 is mostly a stabilization release which also includes several important new features. Platform 2013.2 is shipped with a new version of Ela that includes a refactored support of do notation (first introduced in a previous release). Also do notation in Ela now allows to use let bindings:

do
  putStrLn "What is your height?"
  x <- readAny
  putStrLn "What is your weight?"
  y <- readAny
  let rec = x / y
  putStr (
    if rec > 2.25 then "You're too thin!"
    else if rec < 2 then "You're too heavy!"
    else "You're OK...")
  putStr x

Also a new version of Ela shipped with this platform includes a fix for a serious bug that caused Ela runtime to crush when an overloaded Ela function is beign called from external code (e.g. .NET assembly)

Documentation changes

Documentation library is updated with information about new modules and old modules changes. Also language reference is updated in the part about monads.

Library changes

Standard library in Platform 2013.2 contains several changes an additions. Here is an overview of the most important changes:

A module io was renamed to`file` and moved (along with cell and console modules) to the "unsafe" namespace. These modules are now recommended for testing and debugging purposes only. In order to reference them now once should write open unsafe.console instead of just open console. However if you still want to reference them by a shorter path you can include "unsafe" directory in linker lookup list.
A module read along with its single readStr function is now decomissioned. Instead one should use Read type class from prelude that defines a single read function. Also a generic function gread similar to decomissioned readStr function is available in prelude.
A new module io is introduced. This module contains an implementation of IO monad and console IO actions (readStr, putStr, putStrLn, etc.) that can be used in monadic contexts.