[GHC] #15115: `Numeric.showEFloat` does not honor precision with 0 digits

[GHC]

#15115: `Numeric.showEFloat` does not honor precision with 0 digits
-------------------------------------+-------------------------------------
        Reporter:  guibou            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  libraries/base    |              Version:  8.4.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  libraries/base/tests/Numeric/num008
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4665
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by bgamari):

 * testcase:   => libraries/base/tests/Numeric/num008
 * differential:   => Phab:D4665


Comment:

 Indeed this looks like a bug.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15115#comment:1>
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