simple top-level scope building from assignment exprs
Merge branch 'master' into scopebuilding
checkstyle tho
Merge pull request #153 from mtrberzi/scopebuilding

Scopebuilding
fixes to variable reference binding
"Unit" type -- the type of a value that holds no information
simple digital logic primitive injection
refactor: Unit -> Nil
Merge pull request #157 from mtrberzi/primitive-functions

Primitive functions