Type inaccessible dynamic type is not implicitly convertible

Question

This code works:

contract C {
  function Get() constant returns(bytes8[]) {
    bytes8[] stuff;
    return stuff;
  }
  function Copy() {
    bytes8[] memory stuff = Get();
  }
}

But when I try to call Get() in another way...

contract A {
  A other;
  function Get() constant returns(bytes8[]) {
    bytes8[] stuff;
    return stuff;
  }
  function Copy() {
    bytes8[] stuff = other.Get();
  }
}

I get this error:

DynamicType.sol:8:5: Error: Type inaccessible dynamic type is not implicitly convertible to expected type bytes8[] memory.
    bytes8[] memory stuff = other.Get();
    ^---------------------------------^

I come from the Javascript world where we don't have to worry about storage vs memory types. I have read the section in the Solidity docs on Data Location but it would be helpful to get an explanation particular to this example so that I can better connect the concepts.

Answer 1

To answer the main question that the OP is asking: the problem is that the EVM is unable to read variably-sized data from external function calls.

If you replace, in Get(), bytes8[] with uint you will see the error disappear.

Here (https://gist.github.com/raineorshine/ab40fa8c967e96dc94a1d34e2a79179b) is an example which shows, if you copy paste it in the solidity browser, that the error is not related to storage or memory issues.