todo list

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+# To-do list
+
+In no particular order. Some of the following might need changes to the
+Isabelle prover itself?
+
+[ ] Typing information is implicit in context facts, and the collection must be
+    searched every time we need a type for a term. For performance, should
+    probably implement dedicated tables.
+
+[ ] Tactic-based term elaboration has (at least) two problems:
+    1. `assume(s)` clauses don't accept schematic vars, and
+    2. it often results in overly-flexible subgoals that the typechecker
+    doesn't solve.
+    Will likely need an elaborator integrated into Isabelle's syntax checking.