20a687b8

Created Started Finished

By: Tom Sydney Kerckhove <syd@cs-syd.eu>

Cover the GADT and multi-selector paths of the prefix rule

A constructor written in GADT syntax, a record field written there, and one
field declaration naming two selectors each reach code the resources did not
exercise.

Dropped ScopedTypeVariables with them: the annotation on the listify
predicate binds no type variable, so the extension was never load-bearing.