diff options
Diffstat (limited to 'lib')
-rw-r--r-- | lib/Coqlib.v | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/Coqlib.v b/lib/Coqlib.v index ce5d94eb..58c95723 100644 --- a/lib/Coqlib.v +++ b/lib/Coqlib.v @@ -633,6 +633,13 @@ Qed. Set Implicit Arguments. +(** Comparing option types. *) + +Definition option_eq (A: Type) (eqA: forall (x y: A), {x=y} + {x<>y}): + forall (x y: option A), {x=y} + {x<>y}. +Proof. decide equality. Defined. +Global Opaque option_eq. + (** Mapping a function over an option type. *) Definition option_map (A B: Type) (f: A -> B) (x: option A) : option B := |