Force a linebreak with define-syntax-rule

[jackfirth]

Fixes #59.

[sorawee]

Run racket regen.rkt to update tests. Then we can take a look at the diff to see if the output is reasonable or not.

[jackfirth]

Looks like there aren't many uses of define-syntax-rule in the test files.

[sorawee]

Yeah, there are two, and the other already enters a newline, so there's no change.

The specific example that is changed here unfortunately is not super compelling. But I agree that usually we want to enter a newline.

Thanks again!