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-
-What gets done when printing an interface
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-Basically, we do three things:
-
-A) Create the import decls. For classes and values, this is easy. We
-   filter the CE and GVE for all exported objects that were not declared 
-   in the module. For types, this is a pain because we may have something
-   which is exported and which refers to a type that isn't. For example,
-   the interface
-   interface C where
-   ...
-   f :: A -> B
-   may export B, but A may be expected to come from somewhere else when
-   C is imported. So, we have to go through all envs which have ranges that
-   may refer to a type. This means the TCE, CE (the class op types), 
-   GIE_inst (instance types) and GVE (types in the sigs). AND we have to
-   filter out prelude defined types from the resulting list.
-
-   Finally, we print the import decls, using the conventions that the renamer
-   expects (no explicit constructors/ class ops, etc.)
-
-B) Print the fixity decls for whatever constructors/ functions are exported
-
-C) Print the rest of the decls needed. 
-	1) Type decls - contents of TCE with export flags
-	2) Class decls - contents of CE with export flags
-	3) Instance decls - contents of GIE_inst that refer to either
-                            an exported type or an exported class
-                            (filter then print)
-	4) Value decls - contents of GVE which are not constructors and
-                         which have an export flag
-
-Issues
-~~~~~~
-
-Type synonyms - to expand or not? Let's not, and complain if a type sig. is
-	        used but not defined
-
-Canonical form for interfaces - to get rid of perl post-processing!
-
-Deriving for an abstract data type - shall we worry about this now or later?
-
-Printing issues
-~~~~~~~~~~~~~~~
-
-It's convenient to make all ranges of environments know how to print themselves
-(they do now) and decide whether to do so by looking at the export flag
-in their Name fields. Presumably the constructors of a data type that is
-exported abstractly will decide not to print themselves, so no special code
-is needed.
-
-