#testmode:repl
# Tests for the sub function in various situations
true - false
false - true
false - void
void - false
42 - 23
42 - -23
42 - 0.5
13.37 - 10.37
"a" - "b"
a = 42
b = 23
a - b
a - -b
a - 0.5
#---
#1
#-1
#0
#0
#19
#65
#41.5
#3.0
#ERR:Line 1, column 1: Method 'str_sub' not found
#19
#65
#41.5