Release notes for Agda 2 version 2.2.4

Important changes since 2.2.2:

• Change to the semantics of "open import" and "open module". The declaration

      open import M <using/hiding/renaming>
  

  now translates to

      import A
      open A <using/hiding/renaming>
  

  instead of

      import A <using/hiding/renaming>
      open A.
  

  The same translation is used for "open module M = E …". Declarations involving the keywords as or public are changed in a corresponding way ("as" always goes with import, and "public" always with open).
  This change means that import directives do not affect the qualified names when open import/module is used. To get the old behaviour you can use the expanded version above.
• Names opened publicly in parameterised modules no longer inherit the module parameters. Example:

    module A where
      postulate X : Set

    module B (Y : Set) where
      open A public

In Agda 2.2.2 B.X has type (Y : Set) → Set, whereas in Agda 2.2.4 B.X has type Set.

• Previously it was not possible to export a given constructor name through two different "open public" statements in the same module. This is now possible.
• Unicode subscript digits are now allowed for the hierarchy of universes (Set₀, Set₁, …): Set₁ is equivalent to Set1.