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(* Submitted by Roland Zumkeller *)
Notation "a ? b ; c" := (if a then b else c) (at level 10).
Check (true ? 0 ; 1).
Check if true as x return (if x then nat else bool) then 0 else true.
Notation "'proj1' t" := (let (a,_) := t in a) (at level 1).
Check (fun e : nat * nat => proj1 e).
Notation "'decomp' a 'as' x , y 'in' b" := (let (x,y) := a in b) (at level 1).
Check (decomp (true,true) as t, u in (t,u)).
(* Submitted by Roland Zumkeller *)
Notation "! A" := (forall _:nat, A) (at level 60).
Check ! (0=0).
Check forall n, n=0.
Check forall n:nat, 0=0.
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