mirror of
https://github.com/leanprover/lean4.git
synced 2026-03-17 18:34:06 +00:00
66bc9ae177
This PR deprecates `levelZero` in favor of `Level.zero` and `levelOne`
in favor of the new `Level.one`, and updates all usages throughout the
codebase. The `levelZero` alias was previously required for computed
field `data` to work, but this is no longer needed.
🤖 Prepared with Claude Code
299 lines
6.7 KiB
Lean4
299 lines
6.7 KiB
Lean4
import Lean.Meta
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open Lean
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open Lean.Meta
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partial def fact : Nat → Nat
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| 0 => 1
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| n+1 => (n+1)*fact n
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set_option trace.Meta.debug true
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set_option trace.Meta.check false
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def print (msg : MessageData) : MetaM Unit := do
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trace[Meta.debug] msg
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def checkM (x : MetaM Bool) : MetaM Unit :=
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unless (← x) do throwError "check failed"
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def ex (x_1 x_2 x_3 : Nat) : Nat × Nat :=
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let x := fact (10 + x_1 + x_2 + x_3);
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let ty := Nat → Nat;
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let f : ty := fun x => x;
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let n := 20;
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let z := f 10;
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(let y : { v : Nat // v = n } := ⟨20, rfl⟩; y.1 + n + f x, z + 10)
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def tst1 : MetaM Unit := do
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print "----- tst1 -----";
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let c ← getConstInfo `ex;
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lambdaTelescope c.value?.get! fun xs body =>
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withTrackingZetaDelta do
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check body;
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let ys ← getZetaDeltaFVarIds;
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let ys := ys.toList.map mkFVar;
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print ys;
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checkM $ pure $ ys.length == 2;
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let c ← mkAuxDefinitionFor `foo body;
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print c;
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check c;
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pure ()
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#eval tst1
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#print foo
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def tst2 : MetaM Unit := do
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print "----- tst2 -----";
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let nat := mkConst `Nat;
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let t0 := mkApp (mkConst `IO) nat;
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let t := mkForall `_ BinderInfo.default nat t0;
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print t;
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check t;
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forallBoundedTelescope t (some 1) fun xs b => do
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print b;
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checkM $ pure $ xs.size == 1;
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checkM $ pure $ b == t0;
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pure ()
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/--
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trace: [Meta.debug] ----- tst2 -----
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[Meta.debug] Nat → IO Nat
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[Meta.debug] IO Nat
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-/
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#guard_msgs in
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#eval tst2
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def tst3 : MetaM Unit := do
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print "----- tst2 -----";
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let nat := mkConst `Nat;
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let t0 := mkApp (mkConst `IO) nat;
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let t := t0;
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print t;
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check t;
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forallBoundedTelescope t (some 0) fun xs b => do
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print b;
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checkM $ pure $ xs.size == 0;
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checkM $ pure $ b == t0;
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pure ()
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/--
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trace: [Meta.debug] ----- tst2 -----
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[Meta.debug] IO Nat
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[Meta.debug] IO Nat
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-/
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#guard_msgs in
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#eval tst3
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def tst4 : MetaM Unit := do
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print "----- tst4 -----";
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let nat := mkConst `Nat;
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withLocalDeclD `x nat fun x =>
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withLocalDeclD `y nat fun y => do
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let m ← mkFreshExprMVar nat;
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print (← ppGoal m.mvarId!);
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let val ← mkAppM `Add.add #[mkNatLit 10, y];
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let ⟨zId, nId, subst⟩ ← m.mvarId!.assertAfter x.fvarId! `z nat val;
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print m;
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print (← ppGoal nId);
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nId.withContext do {
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print m!"{subst.apply x} {subst.apply y} {mkFVar zId}";
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nId.assign (← mkAppM `Add.add #[subst.apply x, mkFVar zId]);
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print (mkMVar nId)
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};
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print m;
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let expected ← mkAppM `Add.add #[x, val];
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checkM (isDefEq m expected);
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pure ()
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set_option pp.mvars false in
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/--
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trace: [Meta.debug] ----- tst4 -----
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[Meta.debug] x y : Nat
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⊢ Nat
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[Meta.debug] ?_ (Add.add 10 y) y
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[Meta.debug] x z y : Nat
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⊢ Nat
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[Meta.debug] x y z
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[Meta.debug] Add.add x z
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[Meta.debug] Add.add x (Add.add 10 y)
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-/
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#guard_msgs in
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#eval tst4
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def tst5 : MetaM Unit := do
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print "----- tst5 -----";
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let prop := mkSort Level.zero;
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withLocalDeclD `p prop fun p =>
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withLocalDeclD `q prop fun q => do
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withLocalDeclD `h₁ p fun h₁ => do
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let eq ← mkEq p q;
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withLocalDeclD `h₂ eq fun h₂ => do
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let m ← mkFreshExprMVar q;
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let r ← m.mvarId!.replaceLocalDecl h₁.fvarId! q h₂;
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print (← ppGoal r.mvarId);
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r.mvarId.assign (mkFVar r.fvarId);
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print m;
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check m;
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pure ()
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/--
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trace: [Meta.debug] ----- tst5 -----
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[Meta.debug] p q : Prop
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h₁ : q
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h₂ : p = q
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⊢ q
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[Meta.debug] Eq.mp h₂ h₁
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-/
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#guard_msgs in
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#eval tst5
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def tst6 : MetaM Unit := do
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print "----- tst6 -----";
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let nat := mkConst `Nat;
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withLocalDeclD `x nat fun x =>
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withLocalDeclD `y nat fun y => do
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let m ← mkFreshExprMVar nat;
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print (← ppGoal m.mvarId!);
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let val ← mkAppM `Add.add #[mkNatLit 10, y];
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let ⟨zId, nId, subst⟩ ← m.mvarId!.assertAfter y.fvarId! `z nat val;
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print m;
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print (← ppGoal nId);
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nId.withContext do {
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print m!"{subst.apply x} {subst.apply y} {mkFVar zId}";
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nId.assign (← mkAppM `Add.add #[subst.apply x, mkFVar zId]);
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print (mkMVar nId)
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};
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print m;
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let expected ← mkAppM `Add.add #[x, val];
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checkM (isDefEq m expected);
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pure ()
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set_option pp.mvars false in
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/--
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trace: [Meta.debug] ----- tst6 -----
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[Meta.debug] x y : Nat
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⊢ Nat
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[Meta.debug] ?_ (Add.add 10 y)
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[Meta.debug] x y z : Nat
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⊢ Nat
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[Meta.debug] x y z
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[Meta.debug] Add.add x z
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[Meta.debug] Add.add x (Add.add 10 y)
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-/
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#guard_msgs in
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#eval tst6
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def tst7 : MetaM Unit := do
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print "----- tst7 -----";
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let nat := mkConst `Nat;
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withLocalDeclD `x nat fun x =>
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withLocalDeclD `y nat fun y => do
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let val ← mkAppM `Add.add #[x, y];
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print val;
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let val := val.replaceFVars #[x, y] #[mkNatLit 0, mkNatLit 1];
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print val;
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let expected ← mkAppM `Add.add #[mkNatLit 0, mkNatLit 1];
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print expected;
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checkM (pure $ val == expected);
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pure ()
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/--
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trace: [Meta.debug] ----- tst7 -----
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[Meta.debug] Add.add x y
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[Meta.debug] Add.add 0 1
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[Meta.debug] Add.add 0 1
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-/
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#guard_msgs in
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#eval tst7
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def aux := [1, 2, 3].isEmpty
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def tst8 : MetaM Unit := do
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print "----- tst8 -----"
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let t := mkConst `aux
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let some t ← unfoldDefinition? t | throwError "unexpected"
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let some t ← unfoldDefinition? t | throwError "unexpected"
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print t
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let t ← whnfCore t
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print t
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pure ()
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/--
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trace: [Meta.debug] ----- tst8 -----
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[Meta.debug] match [1, 2, 3] with
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| [] => true
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| head :: tail => false
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[Meta.debug] false
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-/
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#guard_msgs in
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#eval tst8
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def tst9 : MetaM Unit := do
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print "----- tst9 -----"
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let defInsts ← getDefaultInstances `OfNat
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print (toString defInsts)
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pure ()
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/--
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trace: [Meta.debug] ----- tst9 -----
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[Meta.debug] [(instOfNatNat, 100)]
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-/
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#guard_msgs in
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#eval tst9
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mutual
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inductive Foo (α : Type) where
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| mk : List (Bla α) → Foo α
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| leaf : α → Foo α
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inductive Bla (α : Type) where
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| nil : Bla α
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| cons : Foo α → Bla α → Bla α
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end
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def tst10 : MetaM Unit := do
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assert! !(← getConstInfoInduct `List).isNested
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assert! (← getConstInfoInduct `Bla).isNested
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assert! (← getConstInfoInduct `Foo).isNested
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assert! !(← getConstInfoInduct `Prod).isNested
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#guard_msgs in
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#eval tst10
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def tst11 : MetaM Unit := do
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print "----- tst11 -----"
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withLocalDeclD `x (mkConst ``True) fun x =>
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withLocalDeclD `y (mkConst ``True) fun y => do
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checkM (isDefEq x y)
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pure ()
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/-- trace: [Meta.debug] ----- tst11 ----- -/
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#guard_msgs in
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#eval tst11
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def tst12 : MetaM Unit := do
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print "----- tst12 -----";
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let nat := mkConst `Nat
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withLocalDeclD `x nat fun x =>
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withLocalDeclD `y nat fun y => do
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let val ← mkAppM' (mkConst `Add.add [Level.zero]) #[mkNatLit 10, y];
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check val; print val
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let val ← mkAppM' (mkApp (mkConst ``Add.add [Level.zero]) (mkConst ``Int)) #[mkApp (mkConst ``Int.ofNat) (mkNatLit 10), mkApp (mkConst ``Int.ofNat) y];
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check val; print val
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let val ← mkAppOptM' (mkConst `Add.add [Level.zero]) #[mkConst ``Nat, none, mkNatLit 10, y];
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check val; print val
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pure ()
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/--
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trace: [Meta.debug] ----- tst12 -----
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[Meta.debug] Add.add 10 y
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[Meta.debug] Add.add (Int.ofNat 10) (Int.ofNat y)
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[Meta.debug] Add.add 10 y
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-/
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#guard_msgs in
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#eval tst12
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#check @Add.add
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