gistfile1.txt

enum Expression{
    Number, 
    Add(Option<Expression>,Option<Expression>),
    Mult(Option<Expression>,Option<Expression>)
}


/home/maik/hello.rs:1:0: 5:1 error: illegal recursive enum type; wrap the inner value in a box to make it representable
/home/maik/hello.rs:1 enum Expression{
/home/maik/hello.rs:2     Number, 
/home/maik/hello.rs:3     Add(Option<Expression>,Option<Expression>),
/home/maik/hello.rs:4     Mult(Option<Expression>,Option<Expression>)
/home/maik/hello.rs:5 }
error: aborting due to previous error
[Finished in 0.3s with exit code 101]