This is partly due to the fact that Common Lisp rules are used for syntax highlighting - so the function, macro and special form names are highlighted somewhat randomly.
```lisp
foo
```
```
foo
```
EDIT: Submitted a PR https://github.com/alephyud/bel/pull/5
You can see what it looks like here: https://github.com/shawwn/bel/blob/085b39f5b8ee9e50b9776972b...