ExtendEntry keys for constr notations
type production_position = | | BorderProd of Constrexpr.side * Gramlib.Gramext.g_assoc option | 
| | InternalProd | 
val production_level_eq : production_level -> production_level -> boolUser-level types used to tell how to parse or interpret of the non-terminal
type 'a constr_entry_key_gen = | | ETIdent | 
| | ETName | 
| | ETGlobal | 
| | ETBigint | 
| | ETBinder of bool | 
| | ETConstr of Constrexpr.notation_entry * Notation_term.notation_binder_kind option * 'a | 
| | ETPattern of bool * int option | 
Entries level (left-hand side of grammar rules)
type constr_entry_key = (production_level * production_position) constr_entry_key_genval constr_entry_key_eq : constr_entry_key -> constr_entry_key -> boolval constr_entry_key_eq_ignore_binder_kind : constr_entry_key -> constr_entry_key -> boolEntries used in productions, vernac side (e.g. "x bigint" or "x ident")
type simple_constr_prod_entry_key = production_level constr_entry_key_genEntries used in productions (in right-hand-side of grammar rules), to parse non-terminals
type binder_entry_kind = | | ETBinderOpen | 
| | ETBinderClosed of constr_prod_entry_key option * (bool * string) list | 
and constr_prod_entry_key = | | ETProdIdent | 
| | ETProdName | 
| | ETProdGlobal | 
| | ETProdBigint | 
| | ETProdOneBinder of bool | 
| | ETProdConstr of Constrexpr.notation_entry * production_level * production_position | 
| | ETProdPattern of int | 
| | ETProdConstrList of Constrexpr.notation_entry * production_level * production_position * (bool * string) list | 
| | ETProdBinderList of binder_entry_kind | 
type 'a user_symbol = | | Ulist1 of 'a user_symbol | 
| | Ulist1sep of 'a user_symbol * string | 
| | Ulist0 of 'a user_symbol | 
| | Ulist0sep of 'a user_symbol * string | 
| | Uopt of 'a user_symbol | 
| | Uentry of 'a | 
| | Uentryl of 'a * int | 
type ('a, 'b, 'c) ty_user_symbol = | | TUlist1 : ('a, 'b, 'c) ty_user_symbol -> ('a list, 'b list, 'c list) ty_user_symbol | 
| | TUlist1sep : ('a, 'b, 'c) ty_user_symbol * string -> ('a list, 'b list, 'c list) ty_user_symbol | 
| | TUlist0 : ('a, 'b, 'c) ty_user_symbol -> ('a list, 'b list, 'c list) ty_user_symbol | 
| | TUlist0sep : ('a, 'b, 'c) ty_user_symbol * string -> ('a list, 'b list, 'c list) ty_user_symbol | 
| | TUopt : ('a, 'b, 'c) ty_user_symbol -> ('a option, 'b option, 'c option) ty_user_symbol | 
| | TUentry : ('a, 'b, 'c) Genarg.ArgT.tag -> ('a, 'b, 'c) ty_user_symbol | 
| | TUentryl : ('a, 'b, 'c) Genarg.ArgT.tag * int -> ('a, 'b, 'c) ty_user_symbol |