Sample code
========================
class foo{}
void main(){
	alias shared foo bar; // results in error
	//alias shared(foo) bar; // works
	shared(foo) x = new bar();
}
========================

Result with dmd 2.037
(Bug report lists dmd 2.036 since 2.037 was not an option at the time)

$ dmd test.d
test.d(4): Error: cannot implicitly convert expression (new foo) of type test.foo to shared(foo)