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* marks an incompatible change
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  * calls to prover can now be asynchronous 
    Driver.prove_task now returns some intermediate value (of type
    prover_call), which can be queried in two ways:
    - blocking way with Call_provers.wait_on_call
    - non-blocking way with Call_provers.query_call
    So old code performing "prove_task t () ()" should be translated to
    "wait_on_call (prove_task t ()) ()".
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  o record types in the logic
    - introduced with syntax "type t = {| a:int; b:bool |}"
    - actually syntactic sugar for "type t = T (a:int) (b:bool)"
      i.e. an algebraic with one constructor and projection functions

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version 0.64, Feb 16, 2011
==========================

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  o configure: if possible, use ocamlfind to find lablgtk2 and sqlite3
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  o algebraic types: must be well-founded, non-positive constructors
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    are forbidden, recursive functions and predicates must
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    structurally terminate
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  * syntax: /\ renamed into && and \/ into ||
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  o accept lowercase names for axioms, lemmas, goals, and cases in
    inductive predicates
  o labels in terms and formulas are not printed by default. 
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  o transformation split-goal does not split under disjunction anymore
  o fixed --enable-local
  o why.conf is no more looked for in the current directory; use -C or
    WHY3CONFIG instead
  o why.conf: when changed, a backup up copy is made in why.conf.bak
  o why.conf now contains a magic number; configuration must be
    rebuilt with why3config if the magic number has changed
  o why3config: --autodetect-provers renamed to --detect-provers
                --autodetect-plugins renamed to --detect-plugins
     new option --detect to perform both detections
  o why3config: --conf_file is replaced by -C and --config
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  o TPTP: encoding by explicit polymorphism is not anymore the
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    default encoding for TPTP provers. It is now forbidden to use this
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    encoding in presence of finite types.
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  o IDE: source file names are stored in database with paths relative
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    to the database, so that databases are now easier to move from a
    machine to another (e.g when they are stored in source control
    repositories)
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  o better Gappa output: support for sqrt, for negative constants
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version 0.63, Dec 21, 2010
==========================

  o first public release. See release notes in manual