-fwarn-unused-imports confused by hi-boot files

# ghc -fwarn-unused-imports C.hs

C.hs:1:
    Warning: Module `A' is imported, but nothing from it is used
             (except perhaps instances visible in `A')



However if I comment out the import of A I get


./B.hi-boot:3:
    tcLookup: `A.A' is not in scope
    In the type synonym declaration for `AS'

C.hs:1:
    Failed to load interface for `A':
        Bad interface file: ./A.hi
            ./A.hi: openBinaryFile: does not exist (No such file or directory)

C.hs:1:
    Failed to find interface decl for `A.A'
    from module `A'

C.hs:1:
    Failed to find interface decl for `A.A'
    from module `A'
module A where

data Amodule B where

type AS = [A.A]module C where

import {-# SOURCE #-} A
import {-# SOURCE #-} B

type ASS = [AS]_______________________________________________
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