First draft of AltFun and AltMap.
First draft of Alt.
Nothing and NothingAppliedException.
Added imports to Nothing
Added return type declaration to nothingFunction.f
Some work toward actually making use of the generic Alt.
Added ErrorWriter.java
Renamed ErrorWriterImpl to DummyErrorWriterImpl
Some cleanup and further groundwork for making the generic Alt useful.
Cleanup and some renaming.
A bunch of work rewriting a dead-end type design.
Everything might be done now on the redesign, unless compiler thinks otherwise.
Did cleanup. Actually added a bunch of the new files. Still need to check if actually compiles. Presumably not yet.
Things finally, finally compile.
Absent preFilter now doesn't produce an error.