HazelTests.Elaboration
  ✅ Single integer
  ✅ Empty hole
  ✅ Free variable
  ✅ Let expression
  ✅ Inconsistent binary operation
  ✅ Consistent if statement
  ✅ An unapplied function
  ✅ Application of function on free variable
  ✅ Inconsistent case statement
  ✅ Let expression for a function
  ✅ Function application with a deferred argument
  ✅ Function application with a single remaining argument after deferral
  ✅ Function application with a deferral of a hole
HazelTests.StringUtil
  ✅ empty string splits
  ✅ split on empty string
  ✅ split with no matches
  ✅ split with one match
  ✅ split with multiple matches
  ✅ split with empty inbetweens
  ✅ regexp special character in separator
HazelTests.Statics
  ✅ Function with unknown param
  ✅ Function with known param
  ✅ bifunction
  ✅ function application
  ✅ function deferral
HazelTests.Evaluator
  ✅ Integer literal
  ✅ Integer sum
  ✅ Function application
  ✅ Function deferral
  ✅ Deferral applied to hole
HazelTests.ListUtil
  ✅ rev_if with false
  ✅ rev_if with true
  ✅ dedup
  ✅ dedup_f
  ✅ group_by with constant function preserves list
  ✅ group_by groups into evens/odds
  ✅ range generates sequential integers [1,6)
  ✅ range defaults lower bound to 0
  ✅ range lo = hi is empty
  ✅ Invalid range raises error
  ✅ mk_frame creates a frame from the beginning
  ✅ mk_frame creates a frame from the end
  ✅ mk_frame raises when making a frame past the end
  ✅ mk_frame raises when making a frame before the beginning
  ✅ mk_frame makes a frame splitting the list
  ✅ mk_frame makes a frame splitting the list
  ✅ split with no found element returns the original list
  ✅ split with first found returns the head and tail
  ✅ splits on the middle element
  ✅ combine_opt
  ✅ is_empty with empty list
  ✅ is_empty with non-empty list
  ✅ flat_map with empty list
  ✅ flat_map with non-empty list
  ✅ flat_map with non-empty list and empty result
  ✅ join with empty list
  ✅ join with single element list
  ✅ join with multiple element list
  ✅ hd_opt with empty list
  ✅ hd_opt with non-empty list
  ✅ nth_opt with empty list
  ✅ nth_opt with non-empty list
  ✅ nth_opt with out of bounds index
  ✅ split_n_opt with empty list
  ✅ split_n_opt with non-empty list
  ✅ split_n_opt with out of bounds index
  ✅ split_n_opt with zero index
  ✅ split_n with empty list
  ✅ split_n with non-empty list
  ✅ split_n with out of bounds index
  ✅ split_n with zero index
  ✅ split_sublist_opt with empty list
  ✅ split_sublist_opt with non-empty list
  ✅ split_sublist_opt with out of bounds index
  ✅ split_sublist_opt with zero index
  ✅ split_sublist with empty list
  ✅ split_sublist with non-empty list
  ✅ split_sublist with out of bounds index
  ✅ split_sublist with zero index
  ✅ sublist with empty list
  ✅ sublist with non-empty list
  ✅ sublist with out of bounds index
HazelTests.MakeTerm
  ✅ Integer Literal
  ✅ Empty Hole
  ✅ Free Variable
  ✅ Parenthesized Expression
  ✅ Let Expression
  ✅ Function Application
  ✅ Named Function Definition
  ✅ Incomplete Function Definition
  ✅ Constructor
  ✅ Type Alias