more symbol related fixes

lib/parfait/method.rb

@@ -37,7 +37,7 @@ module Parfait
     # used to determine if a send must be issued
     # return index of the name into the message if so
     def has_var name
-      raise "uups #{name}.#{name.class}" unless name.is_a? Word
+      raise "uups #{name}.#{name.class}" unless name.is_a? Symbol
       index = has_arg(name)
       return index if index
       has_local(name)
@@ -45,22 +45,22 @@ module Parfait
 
     # determine whether this method has an argument by the name
     def has_arg name
-      raise "uups #{name}.#{name.class}" unless name.is_a? Word
+      raise "uups #{name}.#{name.class}" unless name.is_a? Symbol
       @arg_names.index_of name
     end
 
     # determine if method has a local variable or tmp (anonymous local) by given name
     def has_local name
-      raise "uups #{name}.#{name.class}" unless name.is_a? Word
-      index = @locals.index(name)
-      index = @tmps.index(name) unless index
+      raise "uups #{name}.#{name.class}" unless name.is_a? Symbol
+      index = @locals.index_of(name)
+      index = @tmps.index_of(name) unless index
       index
     end
 
     def ensure_local name
       index = has_local name
       return index if index
-      @locals << name
+      @locals.push name
       @locals.length
     end