[GHC] #11159: '-interactive-print myPrint' forgotten after :load or :reload

[GHC]

#11159: '-interactive-print myPrint' forgotten after :load or :reload
-------------------------------------+-------------------------------------
        Reporter:  hukarere          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  GHCi              |              Version:  7.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #5461             |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by thomie):

 * cc: watashi (added)


Comment:

 Hi bravit, thanks for having a look.

 After a `:reload`, the interactive printer doesn't work anymore. Here is
 an example.

 {{{
 $ cat Test.hs
 module SpecPrinter where
 import System.IO

 sprint a = putStrLn $ show a ++ "!"
 }}}

 {{{
 $ ~/ghc-devel2/inplace/bin/ghc-stage2 --version
 The Glorious Glasgow Haskell Compilation System, version 7.11.20151216
 }}}

 {{{
 $ ~/ghc-devel2/inplace/bin/ghc-stage2 --interactive -interactive-
 print=SpecPrinter.sprint Test
 GHCi, version 7.11.20151216: http://www.haskell.org/ghc/  :? for help
 [1 of 1] Compiling SpecPrinter      ( Test.hs, interpreted )
 Ok, modules loaded: SpecPrinter.
 *SpecPrinter> "hi"
 "hi"!
 *SpecPrinter> :reload
 Ok, modules loaded: SpecPrinter.
 *SpecPrinter> "hi"
 "hi"
 }}}

 Note that after the `:reload`, the exclamation mark (`!`) isn't printed
 anymore.

 Do you agree this is not working as expected? I'm seeing the same
 behaviour with ghc-7.10.3 as with HEAD.

 CC @watashi, as the author of D867. I also note that a test was missing
 from that Diff, so maybe it recently got broken again?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11159#comment:5>
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