feat(library/logic): import wf.lean in logic/default.lean

We will use well-founded recursion in the definitional package

library/logic/default.lean

@@ -2,7 +2,7 @@
 --- Released under Apache 2.0 license as described in the file LICENSE.
 --- Author: Jeremy Avigad
 
-import logic.connectives logic.eq logic.cast
+import logic.connectives logic.eq logic.cast logic.wf
 import logic.quantifiers logic.if
 import logic.decidable logic.inhabited logic.nonempty
 import logic.instances

tests/lean/acc.lean

@@ -1,4 +1,4 @@
-import logic
+import logic.prop
 
 inductive acc (A : Type) (R : A → A → Prop) :  A → Prop :=
 intro : ∀ (x : A), (∀ (y : A), R y x → acc A R y) → acc A R x

tests/lean/acc_rec_bug.lean

@@ -1,4 +1,4 @@
-import logic
+import logic.prop
 
 inductive acc {A : Type} (R : A → A → Prop) : A → Prop :=
 intro : ∀x, (∀ y, R y x → acc R y) → acc R x