extend String

	test
		assert not X.visitedExtensionTest
		X.visitedExtensionTest = true

	def foo(i as int) as int
		return i
	
	def foo(i as int, j as int) as int
		test
			assert not X.visitedMethodTest
			X.visitedMethodTest = true
		body
			return i + j

	def insert(index as int, value as int) as String
		return ''
		# return .insert(index, value.toString)
	
	def returnThis as String
		return this


extend Object

	def bar(i as int) as int
		return i * 2


class MyObject

	def bar(i as int) as int  # no 'new' or 'override' is required to mask out the extension method of Object
		return i + 1


class X

	shared
		
		var _visitedExtensionTest as bool
		pro visitedExtensionTest from var

		var _visitedMethodTest as bool
		pro visitedMethodTest from var

		def main
			# test that tests on extension methods are run
			assert .visitedExtensionTest
			assert .visitedMethodTest

			s = 'aoeu'
			
			# test overload within the extension
			assert s.foo(5) == 5
			assert s.foo(5, 6) == 11
			
			# test overload against the class
			assert s.insert(2, 'XX') == 'aoXXeu'
#			assert s.insert(2, 3) == ''  TODO

			# test masking extension methods
			assert Object().bar(2) == 4
			assert MyObject().bar(2) == 3