add instance variables and module name as basic types (as name was there already) and add tests

lib/parser/basic_types.rb

@@ -28,7 +28,7 @@ module Parser
     # TODO rule forbit names like if_true, because it starts with a keyword. a little looser please!
     rule(:name)   { keyword.absent? >> (match['a-z_'] >> match['a-zA-Z0-9_'].repeat).as(:name)  >> space? }
     # instance variables must have the @
-    rule(:instance_variable) { (match('@') >> name).as(:instance_variable) }
+    rule(:instance_variable) { (str('@') >> name).as(:instance_variable) }
     # and class/module names must start with capital 
     # (admittatly the rule matches constants too, but one step at a time)
     rule(:module_name) { keyword.absent? >> (match['A-Z'] >> match['a-zA-Z0-9_'].repeat).as(:module_name)  >> space? }
@@ -43,6 +43,6 @@ module Parser
     
     rule(:float) { integer >>  dot >> integer >> 
                             (exponent >> sign.maybe >> digit.repeat(1,3)).maybe >> space?}
-    rule(:basic_type){ integer | name | string | float }
+    rule(:basic_type){ integer | name | string | float | instance_variable | module_name }
   end
 end