Question about embedded cover group

Coverage
1

Why instantiation of an embedded covergroup is not allowed outside class constructor?

class abc;
bit x;

covergroup cg;
x1: coverpoint x;
endgroup

task run();
cg = new();
endtask

endclass

Compile is failing when i use above code as it is. but when i move “cg = new()” to constructor its working fine.

2

An embedded covergroup is just another property of a class that gets constructed at the same time as all other class properties.