Add tests for #573: Tuples with sequential tails
Add tests for #573: Tuples with sequential tails

Stongly compressed / inlined versions of

https://gist.github.com/lucaswerkmeister/8994c60cf5c0f4641b72/a56e521dcd93a48f5d4154babb6bc70c05f77626

ceylon/ceylon.language,jvasileff/ceylon.language,unratito/ceylon.language,ceylon/ceylon.language,unratito/ceylon.language,jvasileff/ceylon.language