Is there a difference whether a struct is defined inside a contact or outside of it?

Question

Both,

struct Test {
  uint x;
  uint y;
}

contract A {
  Test test;
}

and

contract A {
  struct Test {
    uint x;
    uint y;
  }

  Test test;
}

are valid ways to define a struct. Is there any difference between both methods?

Answer 1

Basically if you define struct outside the contract you are making it public and every contract which iport the .sol file could use it where as if it is in the contract scope it is private and only the contract itself could use it. Also if it is outside you cold have problems with same named contract.

Example:

struct Test { ... }
contract Test { ... }