bug#27585: segfault when evaluating a file containing only backticks

[Steve Kemp]

> > #5  handle_sigsegv (sig=11, siginfo=<optimized out>, arg=<optimized out>)
> >     at sysdep.c:1811
> > #6  <signal handler called>
> > #7  read1 (readcharfun=readcharfun@entry=35581829, 
> >     pch=pch@entry=0x7ffcc661e010, first_in_list=first_in_list@entry=false)
> >     at lread.c:2923
> 
> Most likely just a stack overflow.

  Agreed, but still I think a segfault is unexpected and could be
 prevented.

Steve
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