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Exhaustiveness messages for GADTs suggest patterns that will not type check #6801
Original bug ID: 6801
Exhaustiveness messages for GADTs are a bit off. They will suggest patterns need to be inserted for constructors that are not actually legal to insert because they will not type check.
A simple example:
type _ value =
The resulting message:
But of course, inserting a pattern for Float _ won't go very well!