[fpc-pascal] Array assignment, and not-a-number

[Mark Morgan Lloyd]

I was having a bit of fun earlier while waiting for a call. Am I correct 
in believing that something like

type    t1= array of integer;

var     a1: t1;
	x: integer;

a1 := [1,2,3,4,5];

can't be done at present, irrespective of any custom definition of the 
:= operator?

Is there an accessible not-a-number constant, to allow me to do 
something like

var     reduce: double= NAN;

   x := reduce + a1;

with an appropriate definition of the + operator without risk that an 
error would try to evaluate it as an ordinary arithmetic expression?

-- 
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

[Opinions above are the author's, not those of his employers or colleagues]