diff --git a/src/Lean/Data/Json/Parser.lean b/src/Lean/Data/Json/Parser.lean
index a243aaa8bb..16063b64e7 100644
--- a/src/Lean/Data/Json/Parser.lean
+++ b/src/Lean/Data/Json/Parser.lean
@@ -128,6 +128,7 @@ def escapedChar : Quickparse Char := do
     Char.ofNat $ 4096*u1 + 256*u2 + 16*u3 + u4
   | _ => fail "illegal \\u escape"
 
+set_option trace.compiler true in
 partial def strCore (acc : String) : Quickparse String := do
   let c ← peek!
   if c = '"' then -- "
diff --git a/src/Lean/PrettyPrinter/Delaborator/Basic.lean b/src/Lean/PrettyPrinter/Delaborator/Basic.lean
index ab795655d5..3c37a516bd 100644
--- a/src/Lean/PrettyPrinter/Delaborator/Basic.lean
+++ b/src/Lean/PrettyPrinter/Delaborator/Basic.lean
@@ -151,7 +151,7 @@ register_builtin_option g_pp_compact_let : Bool := {
 -/
 
 def getPPAll (o : Options) : Bool := o.get `pp.all false
-def getPPBinderTypes (o : Options) : Bool := o.get `pp.binder_types (!getPPAll o)
+def getPPBinderTypes (o : Options) : Bool := o.get `pp.binder_types true
 def getPPCoercions (o : Options) : Bool := o.get `pp.coercions (!getPPAll o)
 def getPPExplicit (o : Options) : Bool := o.get `pp.explicit (getPPAll o)
 def getPPNotation (o : Options) : Bool := o.get `pp.notation (!getPPAll o)
diff --git a/tests/lean/276.lean.expected.out b/tests/lean/276.lean.expected.out
index 090cae994b..ec3a1028b5 100644
--- a/tests/lean/276.lean.expected.out
+++ b/tests/lean/276.lean.expected.out
@@ -1,2 +1,2 @@
-fun {α} => PEmpty.rec.{v, u_1} fun x => α : {α : Sort v} → PEmpty.{u_1} → α
+fun {α : Sort v} => PEmpty.rec.{v, u_1} fun (x : PEmpty.{u_1}) => α : {α : Sort v} → PEmpty.{u_1} → α
 276.lean:13:4-13:15: error: code generator does not support recursor 'PEmpty.rec' yet, consider using 'match ... with' and/or structural recursion
diff --git a/tests/lean/eagerCoeExpansion.lean.expected.out b/tests/lean/eagerCoeExpansion.lean.expected.out
index e7c9069b59..631b0802e7 100644
--- a/tests/lean/eagerCoeExpansion.lean.expected.out
+++ b/tests/lean/eagerCoeExpansion.lean.expected.out
@@ -3,21 +3,23 @@ fun (x : BV 32) => (fun (x : BV 32) => g (f x).val) x
 def r : Nat → Prop :=
 fun (a : Nat) => if a == 0 = true then a != 1 = true else a != 2 = true
 def r : Nat → Prop :=
-fun a =>
+fun (a : Nat) =>
   @ite.{1} Prop
     (@Eq.{1} Bool
-      (@BEq.beq.{0} Nat (@instBEq.{0} Nat fun a b => instDecidableEqNat a b) a
+      (@BEq.beq.{0} Nat (@instBEq.{0} Nat fun (a b : Nat) => instDecidableEqNat a b) a
         (@OfNat.ofNat.{0} Nat 0 (instOfNatNat 0)))
       Bool.true)
     (instDecidableEqBool
-      (@BEq.beq.{0} Nat (@instBEq.{0} Nat fun a b => instDecidableEqNat a b) a
+      (@BEq.beq.{0} Nat (@instBEq.{0} Nat fun (a b : Nat) => instDecidableEqNat a b) a
         (@OfNat.ofNat.{0} Nat 0 (instOfNatNat 0)))
       Bool.true)
     (@Eq.{1} Bool
-      (@bne.{0} Nat (@instBEq.{0} Nat fun a b => instDecidableEqNat a b) a (@OfNat.ofNat.{0} Nat 1 (instOfNatNat 1)))
+      (@bne.{0} Nat (@instBEq.{0} Nat fun (a b : Nat) => instDecidableEqNat a b) a
+        (@OfNat.ofNat.{0} Nat 1 (instOfNatNat 1)))
       Bool.true)
     (@Eq.{1} Bool
-      (@bne.{0} Nat (@instBEq.{0} Nat fun a b => instDecidableEqNat a b) a (@OfNat.ofNat.{0} Nat 2 (instOfNatNat 2)))
+      (@bne.{0} Nat (@instBEq.{0} Nat fun (a b : Nat) => instDecidableEqNat a b) a
+        (@OfNat.ofNat.{0} Nat 2 (instOfNatNat 2)))
       Bool.true)
 def s : Option Nat :=
 ConstantFunction.f myFun 3 <|> ConstantFunction.f myFun 4
diff --git a/tests/lean/unifHintAndTC.lean.expected.out b/tests/lean/unifHintAndTC.lean.expected.out
index e9201a8362..81382ea1dd 100644
--- a/tests/lean/unifHintAndTC.lean.expected.out
+++ b/tests/lean/unifHintAndTC.lean.expected.out
@@ -2,4 +2,4 @@
 (100, 400)
 (49, 576, 576)
 def g : Int → Int → Int :=
-fun x y => @mul.{0} (@magmaOfMul.{0} Int Int.instMulInt) x y
+fun (x y : Int) => @mul.{0} (@magmaOfMul.{0} Int Int.instMulInt) x y