[GHC] #15559: fromJust has no HasCallStack

[GHC]

#15559: fromJust has no HasCallStack
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        Reporter:  nomeata           |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Core Libraries    |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by gridaphobe):

 There were also concerns about API stability, particularly since the
 original implementation exposed the implicit parameter. Now that we have
 the `HasCallStack` alias and a decent set of API functions around it, we
 could swap out the implementation, if necessary, with less potential for
 client breakage.

 I'd support starting to add `HasCallStack` constraints to common partial
 functions like `fromJust`, `head`, etc. Though, is this something that
 should be discussed with the Core Libraries Committee?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15559#comment:2>
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