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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
My understanding is that it is an extension for gcc, specifically.
https://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Case-Ranges.html
what do you mean by that? This is a feature of the used compiler, but not of the language itself?
why
Remember that this is just an extension and not a part of the language.