SumType

[JG via Digitalmars-d-learn]

I am heavily using SumType (which I like very much). The problem 
I am having is that is seems to be causing slow compile times (as 
can be observed by profiling during the compile). The problem 
seems to be with match (which is extremely convenient to use). I 
looked at the code and it does the only reasonable thing too do 
which is to test each handler against each type. The slow compile 
time makes development slower and less pleasant, so I am thinking 
of replacing SumType with my own tagged union and writing out the 
switches by hand. However, I really don't like this idea since it 
makes the code less readable and more prone to errors. Any 
suggestions?