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Version 0.0.5d (20 June 2007)
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o WARNING: The interpreter is STILL not operational!
o Due to buggy behavior, access to the tactics ExpandFun, MoveInCase and RemoveCase has
  temporarily been removed.

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Version 0.0.5c (20 September 2006)
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o WARNING: The interpreter is STILL not operational!
o Admissability analysis widened.
  Case (e1 = e2) : negative now succeeds if the variable is not used in e1 nor e2.
  FORALL e.p                now recursively continues on p (instead of failing).
  EXISTS e.p                now recursively (flipped) continues on p (instead of failing).
o Added the possibility to temporary (within one run of Sparkle) fold proof nodes.
  Added buttons 'fold inactive' and 'unfold all' to TheoremWindow.
o Definedness analysis now stores original statement as well.
  For example: if H1 = ~(i + 1) = _|_,
               then the expressions i and (i+1) are both marked as defined.
  Previously, decomposition caused only i to be marked as defined.
o Added support for 'MatchExpr' alternative.
  Left-hand patterns in lets and wheres should work now.

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Version 0.0.5b (22 June 2006)
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o Rewrote reduction function. Same functionality, several minor bugs in relation to
  the reduction of functions with strict arguments have been corrected.
  WARNING: Due to these changes, the interpreter is not operational any more!
o Rewrote check for case-variables. Now only produces variables on which a case
  distinction is always performed.
o A non-strict case variable is now treated as if it was strict.
o The 'restart' button on the theorem window is now always applicable, even if the
  theorem is used elsewhere. (the 'go' button on the restart-window now does this check)

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Version 0.0.4a (03 October 2003)
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o Updated to a later version of the compiler. Due to some internal changes in the compiler,
  this has the side-effect that some proof sections that were constructed using Sparkle 0.0.3a
  will no longer load correctly in Sparkle 0.0.4a. The following sections are affected:
  
  - All sections that depend on a dictionary, which is most likely to be the case if a
    dictionary is created for a top-level theorem in the section.
    
  The change within the compiler can be summarized as follows: a semi-colon is added to
  the name of each dictionary type. This also affects the names of the functions that
  create a dictionary, select fields from a dictionary and update a dictionary.
  
  The error message that is displayed when an attempt is made to load the section anyway
  will always be of the form:
  
  - "Unable to find symbol X of type Y", where either in X or in Y a reference to a
    dictionary is made.
    
  Unfortunately, this problem can only be corrected by manually editing the section files,
  which are stored in the /Sections subdirectory. Each file begins with a list of SECTION
  DEPENDENCIES. Within this list, the following changes have to be made:
  
  - [dictionary_types]
    All references to "dictionary_<class name>" must be replaced with
                      "dictionary_<class name>;".
  - [dictionary creation]
    All references to "_create_dictionary_<class name>" must be replaced with
                      "_create_dictionary_<class name>;".
  - [dictionary selection]
    All references to "_dictionary_<class name>_select_<member name>" must be replaced with
                      "_dictionary_<class name>;_select_<member name>".
  - [dictionary update]
    All references to "_dictionary_<class name>_updatet_<member name>" must be replaced with
                      "_dictionary_<class name>;_update_<member name>".

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Version 0.0.3a (21 February 2003)
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o Relaxed constraints on 'Injective'.
  Now also applicable when applied on a constructor application in a hypothesis which
  is known to be defined.

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Version 0.0.3a (21 January 2002)
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o Fixed bug in typing algorithm, causing problems with typing variables in goals.
  The erronous situation occurred for example when one hypothesis produced 'x :: a -> Bool'
  and another one produced 'x :: Int -> b'. A unification error used to be given here.
o Fixed bug in mechanism to propagate defaults in cases.
  Complicated patterns used to be handled incorrectly by Sparkle.
o Added feature: a case within the SAME case is now filled in by Sparkle.

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Version 0.0.3a (8 January 2002)
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o Fixed bug with finding Standard Sparkle Environment on some Windows 95/98
  machines. Bug was caused by function 'applicationpath' (from the Object I/O),
  which incorrectly returns the path in MSDOS format (8.3 and all uppercases) on
  some machines.
o Fixed bug with projects where the main module also has a .dcl module.
  These projects can now be loaded correctly.
o Renamed the module 'SparkleEnv' from the Standard Sparkle Environment to
  'StdSparkle'. Made 'StdEnv' again the top-level module (instead of 'SparkleEnv').
  It imports 'StdSparkle'.

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Version 0.0.2a (21 December 2001)
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