Error in code to flatten a list in Ocaml?

In OCaml, all the elements of a list must be the same type. Thus the value 1; 2; 3; 4 is invalid all by itself. It contains two elements that are of type int and one element of type int list .

In essence, your statement of the problem to be solved is impossible.

You can start by writing directly your algorithm, by decomposing the base cases of your input value, ie. The input list is either empty, or the head of the input list is empty, or the head of the input list has a head and a tail.

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