Range Methods Work for Empty Ranges

[4e6]

Summary

Methods on Range were not tested to work with empty ranges like 6.to 1 (when the range start is bigger than the end).
For example, to_vector (when fixed) throws java.lang.NegativeArraySizeException: -1, and each runs indefinitely.

Value

Range methods work for empty ranges like 6.to 1

Specification

• Fix the to_vector implementation, it should be:

   to_vector : Vector.Vector
   to_vector = Vector.new (this.end - this.start) (i -> i + this.start)
  

• Add the appropriate test cases for Range methods

Acceptance Criteria & Test Cases

• Range methods work for empty ranges

[4e6]

Fixed in #1702