libbun/libbun2 — pull request #1 by nikuuchi (2014-05-28 11:07:45+00:00)
Title: update lisp parser(experimental)

It can parse "(+ 1 2)", but it cannot run in option '-l' beacause AST is:
```
parsed:
+ 1 2 { ## by peg : ($Expr)? (_ $Expr)*
#add: + ## by peg : [a-zA-Z]+ / '+' / '-' / '*' / '/' / '%' / '<' / '>'
#integer: 1 ## by peg : [0-9]+
#integer: 2 ## by peg : [0-9]+
}
```

expected:
```
#add { ## by peg : _ ('+' / '-' ) _ $Product
#integer: 1 ## by peg : [0-9]+
#integer: 1 ## by peg : [0-9]+
}
```