Description
Provide proof witnesses for closed type family evaluation.
Description
Template Haskell routine for generating from type family Foo
- FooRefl
- a GADT capturing the equalities of each type family clause 
- reify_Foo
- a function that analyses - TypeReps and reifies the matching clause as a- FooRefl
Note that Type.Reflection is new with GHC v8.2!
See changelog.md for known bugs.