CHANGELOG.md added

CHANGELOG.md

+Change log for curry-frontend
+=============================
+
+Version 0.3.9 (under development)
+=================================
+
+  * Implementation of module pragmas added. Module pragmas of the following
+    types are now parsed and represented in the abstract syntax tree:
+
+    ~~~ {.curry}
+    {-# LANGUAGE LANG_EXT+ #-}
+    {-# OPTIONS "string" #-}
+    {-# OPTIONS_TOOL "string" #-}
+    module Main where
+    ~~~
+
+    where
+
+      - `LANGEXT+` is a non-empty, comma-separated list of the following
+        language extensions: `AnonFreeVars`, `FunctionalPatterns`,
+        `NoImplicitPrelude`, `Records`
+      - `TOOL` is either `KICS2`, `PAKCS`, or some other tool, represented
+        as `Unknown String`.
+
+    While the distinct language pragmas enable the respective language
+    extensions, the OPTIONS pragma is ignored.
+
+    All other texts given in the pragma braces is ignored and treated as
+    a nested comment.
+
+  * Error message for different arities of function equations now also
+    report the corresponding source code positions.
+
+Version 0.3.8
+=============
+
+  * Implemented warnings for non-exhaustive pattern matchings
+    both in function declarations and `case`-expressions - fixes #349.
+
+  * Extended options to enable/disable certain types of warnings.
+
+  * Fixed problem when defining an operator directly after an import statement
+    without import restrictions - fixes #494.
+
+  * Fixed bug w.r.t. polymorphically typed local variables - fixes #480.
+
+  * Fixed missing polymorphism in record labels - fixes #445.
+
+  * Dumping of intermediate structures improved.
+
+  * Fixed bug in type checking w.r.t. recursive type synonyms - fixes 489.
+
+  * Reactivation of Curry interface files.
+    During adaption of the MCC frontend to FlatCurry the Curry interface
+    files have been deactivated and replaced by FlatCurry's interface
+    files. To allow the later addition of type classes to Curry,
+    they have now been reactivated.
+
+  * Implemented missing semantics of functional patterns in combination
+    with non-linear left-hand-sides and as-patterns.
+
+  * Various improvements.
+
+Version 0.3.7
+=============
+
+  * Support for typed FlatCurry expressions added. Now additional type
+    information given by the programmer as in
+
+    ~~~ {.curry}
+    null (unknown :: [()])
+    ~~~
+
+    is represented in FlatCurry and cann therefore be processed by other
+    programs like PAKCS or KICS2.
+
+Version 0.3.6
+=============
+
+  * Error messages are now sorted according to their source code position.
+
+Version 0.3.5
+=============
+
+  * Improved reporting of mutiple type signatures.
+
+Version 0.3.4
+=============
+
+  * Bug in renaming phase fixed.
+
+Version 0.3.3
+=============
+
+  * Corrected translation of `fcase`-expressions.
+
+Version 0.3.2
+=============
+
+  * Non-linear left-hand-sides now work with guarded expressions - fixes #328.
+
+  * Implemented precedence check - fixes #327.
+
+  * Case completion refactored and corrected - fixes #323.
+
+  * Various improvements and refactorings.
+
+Version 0.3.1
+=============
+
+  * Corrected renaming of anonymous free variables - fixes #288.
+
+Version 0.3.0
+=============
+
+  * Massive refactoring of the previous version.
+
+  * All compiler warnings removed.
+
+  * Fixed various implementation bugs (#9, #16, #19, #29, #289).
+