# Implicit creation of an undefined out param variable.
# The warnings generated below are intended to be a temporary situation
class DefaultOut
	
	var _x = ''
	
	def main
		# User method
		x = .getX(true, out s0)
		assert x
		assert s0 == '.BigWalla'
		x =.getX(false, out s0)
		assert not x
		assert s0 == '.'

		s1 = 'something Ignored'
		x = .getX(true, out s1)
		assert x
		assert s1 =='.BigWalla'
		x =.getX(false, out s1)
		assert not x
		assert s1 == '.'
	
		# (nilable) variable in a system method
		d = {'a':'A1', 'b':'B2', 'c':'See3'}
		# result as String?
		x = d.tryGetValue('b', out result)
		assert x and result =='B2'
		x = d.tryGetValue('d', out result)
		assert not x and not result
		result = nil

		# out to a method Parameter
		r = ''
		.testParam(d, r)
		assert r == ''
	
		# out to a field
		assert _x == ''
		ok = d.tryGetValue('a', out _x)
		assert ok
		assert _x == 'A1'
		
		# out in an overloaded method successfully
		ok = int.tryParse('986', out iVal)  # .warning. implicitly declared a variable
		assert ok
		assert iVal == 986
	
		# out in an overloaded method unsuccessfully
		ok = int.tryParse('noway', out iVal1)  # .warning. implicitly declared a variable
		assert not ok
		assert iVal1 == 0
	
	def getX(flag as bool, z as  out String) as bool
		z = '.'
		if flag
			z += 'BigWalla'
			return true
		return false
		
	def testParam(d as Dictionary<of String, String>, x as String)
		ok = d.tryGetValue('a', out x)
		assert ok
		assert x == 'A1'