####################
# Validate basic expressions

####################
# Validate how variables in an expression are handled

####################
# Validate math error reporting
math: Error: Too few arguments
'2 - '
    ^
math: Error: Too few arguments
'ncr(1)'
      ^
math: Error: Expression is bogus
'max()'
   ^
math: Error: Too few arguments
'sin()'
     ^