Re: Variable names of the form section.N.S core dump the parser

[Aaron Hill]

On 2022-05-24 7:40 am, Jean Abou Samra wrote:
> Because there is now a command called \section, so this
> is trying to set a key inside a music function, which is
> not an alist ... This is unfortunate but unavoidable.

Would it be practical for LilyPond to detect and warn when a built-in is 
being redefined?

Granted, one thing I really like about LilyPond is that one can easily 
redefine things as needed.  But would it be burdensome to require a 
little bit of extra syntax that makes clear the user's intention to 
redefine something that already exists?

%%%%
\version "future"

foo = { c2 }     % Works, providing \foo does not exist.
bar = { c4 4 }   % Warns, since \bar does exist.
                 % (Could be made to fail in a "pedantic" mode.)

\redefine bar = { c8 4. }  % Explicitly redefine, no warning needed.
bar := { c8 4. }           % Same, with a possible syntactic shorthand.
%%%%


-- Aaron Hill