#testmode:repl

-1
- 1
- - 1
- - - 1
a = 42
- a
- - a
- - - a
-(-a)
!a
!true
!!true
b = true
!b
!!b
!!!b

#---

#-1
#-1
#1
#-1
#-42
#42
#-42
#42
#false
#false
#true
#false
#true
#false