File: bug_18358.v

package info (click to toggle)
coq 9.1.0%2Bdfsg-3
  • links: PTS, VCS
  • area: main
  • in suites: experimental
  • size: 35,964 kB
  • sloc: ml: 239,908; sh: 4,355; python: 2,985; ansic: 2,644; makefile: 874; lisp: 171; javascript: 63; xml: 24; sed: 2
file content (9 lines) | stat: -rw-r--r-- 291 bytes parent folder | download | duplicates (3) 
1
2
3
4
5
6
7
8
9
 
CoInductive P : nat -> Prop :=
  | Pintro : forall n, P 0 -> P 0 -> P (S n) -> P n.

Lemma P_any : forall n, P n.
Proof.
  cofix IH. intros.
  assert (H: P 0). { apply IH. }  Guarded. (*Guarded: anomaly*)
  apply Pintro. { apply H. } { apply H. } { apply IH. }
Qed. (*Guard checker happy *)