[GHC] #15720: Assign to literals is allowed in ghci

[GHC]

#15720: Assign to literals is allowed in ghci
-------------------------------------+-------------------------------------
           Reporter:  sighingnow     |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  GHCi           |           Version:  8.6.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  GHC accepts
  Unknown/Multiple                   |  invalid program
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 I have been asked that why `1 = 2` is allowed in ghci, which is quite
 confusing for beginners.

 {{{
 > 1 = 2
 > 1
 1
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15720>
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