[GHC] #14219: Include source location information in -ddump-rule-rewrites

[GHC]

#14219: Include source location information in -ddump-rule-rewrites
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        Reporter:  harendra          |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
  (Debugging)                        |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Debugging         |  Unknown/Multiple
  information is incorrect           |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 > Is it feasible/worth it to implement dumping the builtin rules via the
 -ddump-rules option?

 Sadly built-in rules can do things that are hard to express using ordinary
 LHS/RHS pairs.  Like rewriting `4+5` to `9`.  That's why they are
 implemented in code, not pattern matching.

 It would be a worthy thing to document all the built-in rules in
 `PrelRules` in the manual.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14219#comment:4>
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