A while ago Kentaro Hara did some IDL keyword cleanup.

One of the best things he did was to make a single file with a list of all the 
keywords. In that case he was able to set things up so that if the file was 
inaccurate the build would fail; not sure if that’s practical for the various 
feature flags, but it’s helpful to have a single place. Here’s a link to an 
interesting WebKit mailing list message about one of the steps in that 

I’d love us to find a similar way to “manage” and make it so someone can look 
over the entire list of feature flags and conditionals so we can spot problems 

— Darin
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