gistfile1.txt

def a(x); p x; end
#a = 1
b = 2
c = a + b
d = a +b
puts c
puts d

#test.rb:5: warning: ambiguous first argument; put parentheses or even spaces
#test.rb:1:in `a': wrong number of arguments (0 for 1) (ArgumentError)
#	from test.rb:4:in `<main>'

2.2.2 :001 > def a(x); x * 2; end
=> :a
2.2.2 :002 > a +5
(irb):2: warning: ambiguous first argument; put parentheses or a space even after `+' operator
=> 10
2.2.2 :003 >