# 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 A
module B where
type AS = [A.A]
module C where
import {-# SOURCE #-} A
import {-# SOURCE #-} B
type ASS = [AS]_______________________________________________
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