import std.stdio;
class Test1
{
public:
void hello()
{
writeln("hello.");
}
private:
}
void main()
{
Test1 t1;
if (t1 is null) writeln("o");
else writeln("x");
t1 = new Test1;
if (t1 is null) writeln("o");
else writeln("x");
delete t1;
if (t1 is null) writeln("o");
else writeln("x");
t1 = null;
if (t1 is null) writeln("o");
else writeln("x");
}
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