[GHC] #13173: Investigate old comment at the top of SrcLoc

[GHC]

#13173: Investigate old comment at the top of SrcLoc
-------------------------------------+-------------------------------------
        Reporter:  mpickering        |                Owner:  supersven
            Type:  task              |               Status:  new
        Priority:  lowest            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  D3763
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by supersven):

 I'm now running this build .mk (`make -j4`)

 {{{
 SRC_HC_OPTS        = -O0 -H64m
 GhcStage1HcOpts    = -O0
 GhcStage2HcOpts    = -O0
 GhcLibHcOpts       = -O0
 BUILD_PROF_LIBS    = NO
 SplitObjs          = NO
 SplitSections      = NO
 HADDOCK_DOCS       = NO
 BUILD_SPHINX_HTML  = NO
 BUILD_SPHINX_PDF   = NO
 BUILD_MAN          = NO
 }}}

 to make sure nothing breaks without optimization (-O0 -> no optimization).

 My machine config (output of `./configure`):

 {{{
 ----------------------------------------------------------------------
 Configure completed successfully.

    Building GHC version  : 8.3.20170720
           Git commit id  : fa28ec2927e905228283708d6dcc194e4f65d49c

    Build platform        : x86_64-unknown-linux
    Host platform         : x86_64-unknown-linux
    Target platform       : x86_64-unknown-linux

    Bootstrapping using   : /usr/bin/ghc
       which is version   : 8.0.2

    Using (for bootstrapping) : /usr/bin/gcc
    Using gcc                 : gcc
       which is version       : 6.3.0
    Building a cross compiler : NO
    Unregisterised            : NO
    hs-cpp       : gcc
    hs-cpp-flags : -E -undef -traditional
    ar           : ar
    ld           : ld.gold
    nm           : nm
    libtool      :
    objdump      :
    ranlib       : ranlib
    windres      :
    dllwrap      :
    Happy        : /usr/bin/happy (1.19.5)
    Alex         : /usr/bin/alex (3.1.7)
    Perl         : /usr/bin/perl
    sphinx-build : /usr/local/bin/sphinx-build
    xelatex      : /usr/bin/xelatex

    Using LLVM tools
       llc   :
       opt   :
    HsColour : /usr/bin/HsColour

    Tools to build Sphinx HTML documentation available: YES
    Tools to build Sphinx PDF documentation available: YES
 ----------------------------------------------------------------------
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13173#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler