[Agda] Agda 2.4.2

[Ulf Norell]

Agda 2.4.2 has been released.

Download with cabal install Agda-2.4.2 (might need cabal update first) or
go to
http://wiki.portal.chalmers.se/agda/pmwiki.php?n=Main.Download.

Highlights:

- Recursive instance search.

  Instance arguments are much faster than before and now work
  like a proper class system.

- Major improvements to reflection

  - Quoting and unquoting of declarations and pattern matching lambdas.

  - New syntax to simplify using reflection:
      tactic f
    is sugar for
      quoteGoal g in unquote (f g)

More details here:
https://github.com/agda/agda/blob/2.4.2/doc/release-notes/2-4-2.txt

/ Ulf
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