Parenthese (was: RE: Three Questions)

[Nahum Wengrov]

>>2) How can I add parentheses around notes? (Look at the scanned image
>>-- link below -- to see what I mean. It's the two connected 16ths at
>>the end of the 2nd line, the 1st one with lyrics.)
  
>Well, sort of. See the example called "stencil-hacking.ly" in the 
>Regression Test document. If you search the mailing list archives, you 
>may find more information.

I copied & pasted all the code marked as "ly snippet" in the example to a
new .ly file, but the .pdf output still has no parentheses. Should I have
copied the first section to some other file?