In printing, factorizing "match" clauses with same right-hand side.

Moreover, when there are at least two clauses and the last most
factorizable one is a disjunction with no variables, turn it into a
catch-all clause.

Adding options

  Unset Printing Allow Default Clause.

to deactivate the second behavior, and

  Unset Printing Factorizable Match Patterns.

to deactivate the first behavior (deactivating the first one
deactivates also the second one).

E.g. printing

  match x with Eq => 1 | _ => 0 end

gives

  match x with
  | Eq => 1
  | _ => 0
  end

or (with default clause deactivates):

  match x with
  | Eq => 1
  | Lt | Gt => 0
  end

More to be done, e.g. reconstructing multiple patterns in Nat.eqb...

1 files changed, 1 insertions, 0 deletions

diff --git a/API/API.mli b/API/API.mli
index 99ba3eea47..089cf8b15e 100644
--- a/API/API.mli
+++ b/API/API.mli
@@ -4339,6 +4339,7 @@ sig
   | Later : [ `thunk ] delay
   val print_universes : bool ref
   val print_evar_arguments : bool ref
+  val print_allow_match_default_clause : bool ref
   val detype : 'a delay -> ?lax:bool -> bool -> Names.Id.Set.t -> Environ.env -> Evd.evar_map -> EConstr.constr -> 'a Glob_term.glob_constr_g
   val subst_glob_constr : Mod_subst.substitution -> Glob_term.glob_constr -> Glob_term.glob_constr
   val set_detype_anonymous : (?loc:Loc.t -> int -> Names.Id.t) -> unit