var st := struct{ x := 1 };

print( TypeOf( st ) );
print( TypeOfInt( st ) );
print( st.size() );

st.+y := 2;
print( st );
print( st.size() );
print( st.?y );
print( st.?missing );

st.-y;
print( st );
print( st.size() );

// Removing a member that is not there leaves the struct alone.
st.-missing;
print( st );

// A method the compiler does not know is looked up by name at runtime.
var unknown := st.no_such_method();
print( unknown );