haskell - Syntax for importing methods of type classes -

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i noticed ghc doesn't complain if import (or export) methods of type classes directly:

import prelude (signum)

as opposed using "constructor" syntax:

import prelude (num(signum))

because of this, assumed former syntax ok , went it. however, ran odd issue frominteger, former syntax doesn't work -- ghc accept silently, complain later frominteger never exported in first place. did happen stumble upon unspecified behavior in language?

here's minimal test case:

-- a.hs module (frominteger) import prelude (frominteger)  -- b.hs module b import prelude () import f = frominteger


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