I created gogoprotobuf, but I wanted to create a new code generator for go 
that does not only work for protocol buffers, but for all go types.

Here is my next generation code generation for go:
https://github.com/awalterschulze/goderive
goderive parses your go code for functions which are not implemented and 
then generates these functions for you by deriving their implementations 
from the parameter types.

These functions includes:
  - recursive functions like GoString and CopyTo
  - functions for sets like Contains and Union and 
  - functions from functional programming like Filter, Fmap and Compose 
(monad)
  - future: concurrent functions like applicative Do (from haxl)

Use cases:
  - More maintainable code
  - Experience or experiment with what it would be like to use generic 
functions in Go ... today.
  - Create user stories for Go 2 in favour of or against generics.
  - Don't argue about using labels and gotos, instead of just writing a 
contains function.
  - Do functional programming in go.  Well only partly because mutability 
is still a thing.
  - Less typing of: `if err != nil return err`. The compose function 
implements monadic error handling.
  - future: less error prone concurrency.

Ready for production and experimentation.

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