/--
error: 'f.go' has already been declared
-/
#guard_msgs in
def f (x : Nat) : Nat :=
  go x
where
  go (x : Nat) : Nat := x
  go (x : Nat) : Nat := x + 1

/--
error: 'g.go' has already been declared
-/
#guard_msgs in
def g (x : Nat) : Nat :=
  go x
where
  go (x : Nat) : Nat := x
  go (x : Nat) (y : Nat) : Nat := x + 1