Some context: this is part of discussions that have taken place at Hacker School [0] on learning goals and doing things that scare you as a programmer [1].

0: https://www.hackerschool.com/

1: https://twitter.com/al3x/status/258631420665274370

I have been looking at ANTLR for trying make a DSL. Ever since I did a Joos1 compiler in school, I'd love to make something awesome.

I am glad you mentioned feedback. For me that has really become a key concept in software engineering and even other areas, like business.