[GHC] #11302: GHC HEAD uses up all memory while compiling `genprimcode`

[GHC]

#11302: GHC HEAD uses up all memory while compiling `genprimcode`
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           Reporter:  hvr            |             Owner:
               Type:  bug            |            Status:  new
           Priority:  highest        |         Milestone:  8.0.1
          Component:  Compiler       |           Version:  7.11
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 When attempting to self-bootstrap GHC HEAD I discovered that
 `utils/genprimocode` can't be compiled with GHC HEAD.

 How to reproduce roughly:

 {{{
 $ cd utils/genprimcode
 $ alex --ghc Lexer.x
 $ happy --ghc Parser.y
 $ ghc-7.11.20151226 --make Main
 [1 of 5] Compiling ParserM          ( ParserM.hs, ParserM.o )
 [2 of 5] Compiling Lexer            ( Lexer.hs, Lexer.o )
 [3 of 5] Compiling Syntax           ( Syntax.hs, Syntax.o )
 [4 of 5] Compiling Parser           ( Parser.hs, Parser.o )
 [5 of 5] Compiling Main             ( Main.hs, Main.o )
 ...killed by OS due to running out-of-memory after using up >10GiB ram....
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11302>
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