# Library Coq.Program.Utils

Various syntaxic shortands that are useful with Program.
Require Export Coq.Program.Tactics.
A simpler notation for subsets defined on a cartesian product.
Notation "{ ( x , y ) : A | P }" :=
(sig (fun anonymous : A => let (x,y) := anonymous in P))
(x ident, y ident, at level 10) : type_scope.
Generates an obligation to prove False.
Notation " ! " := (False_rect _ _) : program_scope.
Delimit Scope program_scope with prg.
Abbreviation for first projection and hiding of proofs of subset objects.
Notation " ` t " := (proj1_sig t) (at level 10, t at next level) : program_scope.
Coerces objects to their support before comparing them.
Notation " x '`=' y " := (( x :>) = ( y :>)) (at level 70) : program_scope.
Require Import Coq.Bool.Sumbool.
Construct a dependent disjunction from a boolean.
Notation dec := sumbool_of_bool.
The notations in_right and in_left construct objects of a dependent disjunction.
Hide proofs and generates obligations when put in a term.
Notation in_left := (@left _ _ _).
Notation in_right := (@right _ _ _).
Extraction directives