`ModuleDoesntExport` has imprecise deadcode highlighting

[andreasabel]

With standard library v2.0:

open import Data.Bool.Properties  public using (∨-∧-isBooleanAlgebra)
open import Algebra.Lattice.Structures public using
  ( module IsBooleanAlgebra
  )
open IsBooleanAlgebra ∨-∧-isBooleanAlgebra public using
  ( ∧-cong; ∧-comm; ∧-assoc
  ; ∨-cong; ∨-comm; ∨-assoc
  ; ∨-∧-distribʳ
  ; isDistributiveLattice
  )

warning: -W[no]ModuleDoesntExport
The module _ doesn't export the following:
  ∨-∧-distribʳ 
...

The highlighting is imprecise:

Should only highlight the name that isn't exported.