high, len function with sequences

[adilkhash]

Hi.

Following code:

var q: seq[int]
q = @[1,2,3,4,5]
q[high(q)+1] = 10
q[high(q)+2] = 666

echo($high(q))
echo($len(q))
echo($q[5])

C:\nimrod>nimrod c -d:release --opt:size hello
4
5
10

It means that high and len functions are based on static information about sequences?
Maybe echo($high(q)) should print 6 and echo($len(q)) should 7 ?

And if I compile without -d:release and --opt:size (just pure nimrod c hello.nim), I get the following error:

Traceback (most recent call last)
hello.nim(10) hello
Error: unhandled exception: index out of bounds [EInvalidIndex]

Where I'm wrong?

[Araq]

Error: unhandled exception: index out of bounds [EInvalidIndex]
is correct. However, index checks are not generated in release mode so you corrupt memory instead. Use 'add' to append to a sequence.