// RUN: %dafny /compile:0  "%s" > "%t"
// RUN: %diff "%s.expect" "%t"

abstract module AbstractModule1 
{
	type AbstractType1
} 

abstract module AbstractModule2 
{
	import opened AM1 : AbstractModule1
	
	datatype AbstractType2 = AbstractType2(x:AbstractType1)
} 

abstract module AbstractModule3 
{
	import AM1 : AbstractModule1
	
	datatype AbstractType2 = AbstractType2(x:AM1.AbstractType1)
} 

module ConcreteModule1
{
	type AbstractType1 = int
} 

module ConcreteModule2 refines AbstractModule2 
{
	import AM1 = ConcreteModule1 // error: must be declared "opened" to match AbstratctModule2 
} 

module ConcreteModule3 refines AbstractModule3 
{
	import opened AM1 = ConcreteModule1 // error: can't be declared "opened" to match AbstractModule3
}