GHC 8.2.2: GHCi duplicates breakpoint range prompt

I think breakpoint range is being printed twice, once as part of prompt, and the second time by itself.

To reproduce, create test.hs file like this:

module Test where

test :: IO ()
test = putStrLn "Hello, World!"

Then run the following GHCi session:

$ ghci test.hs
GHCi, version 8.2.2: http://www.haskell.org/ghc/  :? for help
[1 of 1] Compiling Test             ( test.hs, interpreted )
Ok, one module loaded.
*Test> :break test
Breakpoint 0 activated at test.hs:4:8-31
*Test> :trace test
Stopped in Test.test, test.hs:4:8-31
_result :: IO () = _
[test.hs:4:8-31] [test.hs:4:8-31] *Test> :set prompt ""
[test.hs:4:8-31]

Notice [test.hs:4:8-31] is printed twice, and is even printed when prompt is set to "".

Trac metadata

Trac field	Value
Version	8.2.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	GHCi
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