Ghci should TAB-complete keywords, not only identifiers

When running ghci, the word "import" is not in the list generated by readline completion. Namely, if to type

> i

the suggestions that appear after pressing <TAB> are

id              isDenormalized  isNegativeZero
init            isIEEE          iterate
interact        isInfinite
ioError         isNaN

If to type

> im

then pressing <TAB> gives beep.

Also, if we have at prompt

> import q

pressing <TAB> does not produce any completion. I would expect to get

> import qualified

Trac metadata

Trac field	Value
Version	7.10.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	GHCi
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