What’s wrong with this code? – 1

What is wrong with the following code? 

struct Foo {
    public int id;
    public string value;
    public static readonly Foo Empty = new Foo(“”);

    public Foo(string val)
         this.value = val;
         this.id = -1;


and elsewhere…

Foo m = new Foo(“Something”); 

if (object.ReferenceEquals(m, Foo.Empty))
    …//do something
} else



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