[ambiguous occurrence bug?]

[Shayne Fletcher]

Sorry in advance if I should be posting questions of this kind elsewhere
(please tell me if so!).

Consider this two file program:
```
module T where
main = undefined

module Main where
import T
main = putStrLn "Hello world!"
```

Both 8.4.3 and 8.6.3 agree:
```
Main.hs:1:1: error:
    Ambiguous occurrence ‘main’
    It could refer to either ‘T.main’,
                             imported from ‘T’ at Main.hs:2:1-8
                             (and originally defined at Main.hs:2:1-4)
                          or ‘Main.main’, defined at Main.hs:5:1
```

Is this expected behavior? Does it not contradict "If the export list is
omitted, all values, types and classes defined in the module are exported,
but not those that are imported" (
https://www.haskell.org/onlinereport/haskell2010/haskellch5.html)? If the
latter, is this a bug? What am I missing?

-- 
Shayne Fletcher
Language Engineer
c: +1 917 699 7763
e: shayne.fletcher at daml.com
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