1	#
2	# let arithmetic.
3
4	#### let
5	# NOTE: no spaces are allowed. How is this tokenized?
6	let x=1
7	let y=x+2
8	let z=y*3 # zsh treats this as a glob; bash doesn't
9	let z2='y*3' # both are OK with this
10	echo $x $y $z $z2
11	## stdout: 1 3 9 9
12	## OK zsh stdout-json: ""
13	## OK zsh status: 1
14
15	#### let with ()
16	let x=( 1 )
17	let y=( x + 2 )
18	let z=( y * 3 )
19	echo $x $y $z
20	## stdout: 1 3 9
21	## status: 0
22	## N-I mksh/zsh stdout-json: ""
23	## N-I mksh/zsh status: 1