diff options
Diffstat (limited to 'backends/lean/Base/Arith/Int.lean')
| -rw-r--r-- | backends/lean/Base/Arith/Int.lean | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/backends/lean/Base/Arith/Int.lean b/backends/lean/Base/Arith/Int.lean index 3359ecdb..a57f8bb1 100644 --- a/backends/lean/Base/Arith/Int.lean +++ b/backends/lean/Base/Arith/Int.lean @@ -162,7 +162,7 @@ def introInstances (declToUnfold : Name) (lookup : Expr → MetaM (Option Expr)) -- Add a declaration let nval ← Utils.addDeclTac name e type (asLet := false) -- Simplify to unfold the declaration to unfold (i.e., the projector) - Utils.simpAt [declToUnfold] [] [] (Tactic.Location.targets #[mkIdent name] false) + Utils.simpAt true [declToUnfold] [] [] (Location.targets #[mkIdent name] false) -- Return the new value pure nval @@ -240,7 +240,7 @@ def intTac (splitGoalConjs : Bool) (extraPreprocess : Tactic.TacticM Unit) : Ta -- the goal. I think before leads to a smaller proof term? Tactic.allGoals (intTacPreprocess extraPreprocess) -- More preprocessing - Tactic.allGoals (Utils.tryTac (Utils.simpAt [] [``nat_zero_eq_int_zero] [] .wildcard)) + Tactic.allGoals (Utils.tryTac (Utils.simpAt true [] [``nat_zero_eq_int_zero] [] .wildcard)) -- Split the conjunctions in the goal if splitGoalConjs then Tactic.allGoals (Utils.repeatTac Utils.splitConjTarget) -- Call linarith @@ -270,6 +270,17 @@ elab "int_tac" args:(" split_goal"?): tactic => let split := args.raw.getArgs.size > 0 intTac split (do pure ()) +-- For termination proofs +syntax "int_decr_tac" : tactic +macro_rules + | `(tactic| int_decr_tac) => + `(tactic| + simp_wf; + -- TODO: don't use a macro (namespace problems) + (first | apply Arith.to_int_to_nat_lt + | apply Arith.to_int_sub_to_nat_lt) <;> + simp_all <;> int_tac) + example (x : Int) (h0: 0 ≤ x) (h1: x ≠ 0) : 0 < x := by int_tac_preprocess linarith |