Weird error from running runghc on an invalid input filename

I had files random.hs and random.hi and random.o, so I accidentally entered the following command with tab completion.

rwbarton@morphism:/tmp$ runghc random.
Warning: ignoring unrecognised input `random.'

random.:1:33:
    Not in scope: ‘main’
    Perhaps you meant ‘min’ (imported from Prelude)

#7765 (closed) is surely related, but with HEAD (well, rather old, but at least new enough to contain the fix for #7765 (closed)), the error is not really any better:

rwbarton@morphism:/tmp$ ~/ghc/inplace/bin/runghc random.
Warning: ignoring unrecognised input `random.'

random.:0:53: error:
    Variable not in scope: main :: IO a0
    Perhaps you meant ‘min’ (imported from Prelude)

Trac metadata

Trac field	Value
Version	7.8.4
Type	Bug
TypeOfFailure	OtherFailure
Priority	low
Resolution	Unresolved
Component	Compiler
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