Cic.metasenv -> Cic.substitution -> Cic.context ->
Cic.term -> Cic.term -> coercion_search_result
-(* checks if term is a constant or
- * a constant applyed that is marked with (`Class `Coercion) *)
-val is_composite: Cic.term -> bool
-
val source_of: Cic.term -> Cic.term
val generate_dot_file: unit -> string