[GHC] #7396: Improve "parse error on input `$'" when TemplateHaskell PRAGMA not declared

[GHC]

#7396: Improve "parse error on input `$'" when TemplateHaskell PRAGMA not declared
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        Reporter:  ydewit               |            Owner:
            Type:  feature request      |           Status:  new
        Priority:  normal               |        Milestone:
       Component:  Template Haskell     |          Version:  7.4.2
      Resolution:                       |         Keywords:
Operating System:  MacOS X              |     Architecture:  x86
 Type of failure:  Building GHC failed  |       Difficulty:  Unknown
       Test Case:                       |       Blocked By:
        Blocking:                       |  Related Tickets:
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Changes (by parcs):

 * status:  closed => new
 * resolution:  wontfix =>


Comment:

 Hi,

 This set of three patches augments errors that may be caused by not having
 TH enabled, to suggest enabling TH.

 Parse errors like the following will now suggest enabling TemplateHaskell:

 {{{
 module A where

 $foo
 }}}

 {{{
 module B where

 foo
 }}}

 {{{
 module C where

 bar = 3 + $(x)
 }}}

 Of course, these are only heuristics so there will be false-positive and
 false-negative cases. But I think these heuristics will help more than
 they will hurt.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7396#comment:3>
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