ZZ>
  > JdeBP>  #include 
  > JdeBP>  double d = 0.9 ;
  > JdeBP>  int
  > JdeBP>  main ( int, char ** )
  > JdeBP>  {
  > JdeBP>      double d = 0.8 ;
  > JdeBP>      {
  > JdeBP>          extern double d ;
  > JdeBP>          printf("%f\n", d) ;
  > JdeBP>      }
  > JdeBP>      return 0 ;
  > JdeBP>  }
  >
  > Ugh. Ok, inner-level names have precedence over globals, so
  > I'm to assume that extern always invokes a global? I've
  > never bent syntax this far.
ZZ>

  Actually, it's to do with linkage. `extern double d' can only match an
  object with external linkage.  Automatic objects do not have any
  linkage, and so cannot match.

  > JdeBP <
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