fix(tests/lean): remove obsolete comments

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

tests/lean/bad2.lean

@@ -3,32 +3,8 @@ Variable nil  {A : Type} : list A
 Variable cons {A : Type} (head : A) (tail : list A) : list A
 Definition n1 : list Int := cons (nat_to_int 10) nil
 Definition n2 : list Nat := cons 10 nil
-(*
-The following example demonstrates that the expected type (list Int)
-does not influece whether coercions are used or not.
-*)
 Definition n3 : list Int := cons 10 nil
-
-(*
-Here are some workarounds for the example above.
-The 'let' construct is one of the main tools for providing
-hints.
-*)
-Definition n3a : list Int :=
-           let a : Int := 10
-           in cons a nil
-
-(* Solution b: we manually provide the coercion *)
-Definition n3b : list Int := cons (nat_to_int 10) nil
-
-(* The folowing example works *)
 Definition n4 : list Int := nil
-
-(*
-The following example demonstrates that we do not do type inference.
-In the current implementation, we first elaborate the type and
-then the body.
-*)
 Definition n5 : _ := cons 10 nil
 
 Set pp::coercion true

tests/lean/bad2.lean.expected.out

@@ -6,8 +6,6 @@
   Defined: n1
   Defined: n2
   Defined: n3
-  Defined: n3a
-  Defined: n3b
   Defined: n4
   Defined: n5
   Set: lean::pp::coercion