A simple test follows:

Hello, world!

Now get into variable nesting:

My message.

My message.

My message.

My message.

My message.

My message.

My message.

My message.

More deep nesting...

My message.

one

one

Nesting inside nesting...

two

two

two

two

Test underscores...

out

out

Test literals in a variable expression:

1 + 2 = 3

out3

true

Test #empty

"hello" + #empty = hello

#empty + "hello" = hello

3 + #empty = 3

#empty + 4 = 4

3 + 4 + #empty = 7

3 + #empty + 4 = 34

#empty + 3 + 4 = 34