trigger error if an array of unknown size is being returned #190
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Related issues: #154 #161 #177
This PR adds code to send an error message when a user tries to return an array of unknown size in a function.
As shown in the aforementioned issues, returning arrays of unknown size can give unexpected results. This is the case as it is practically impossible to move contents of one array into another without knowing the size of the arrays.
The compiler aborts (due to a failed assertion) when an array of unknown size is being returned (unless a release build of the compiler is being used). This PR changes it to an error message.