- [x] semant stage
- [ ] generalized expect `Output ('a option) | Exception of (exn -> bool)`
- [x] run all book test case files
- - [ ] grid view (cols: lex, pars, semant, etc.; rows: test cases.)
+ - [-] grid view (cols: lex, pars, semant, etc.; rows: test cases.)
+ - [x] implementation
+ - [ ] refactoring
- [ ] Travis CI
### Features