> Also, it is important to update the syntax-table only after making sure that
> the new position is valid.  So I believe the patch below is what we want.
> 
> 
>         Stefan
> 
> 
> --- orig/src/syntax.c
> +++ mod/src/syntax.c
> @@ -1691,10 +1691,10 @@
>  		      p = GPT_ADDR;
>  		      stop = endp;
>  		    }
> +		  UPDATE_SYNTAX_TABLE_BACKWARD (pos - 1);
>  		  if (! fastmap[(int) SYNTAX (p[-1])])
>  		    break;
>  		  p--, pos--;
> -		  UPDATE_SYNTAX_TABLE_BACKWARD (pos - 1);
>  		}
>  	  }
>        }

Indeed, though I'd prefer the attached one.

BTW, did you look at the backward-word problem I mentioned in my previous mail?