You asked when it became a feature. I answered that.
But your antipathy towards the feature is misplaced. Several languages with the most rigorous foundations support shadowing: SML, Ocaml, Haskell, Scheme,
You're probably more familiar with languages that have unrestricted mutation, in which case something much worse than shadowing is allowed: changing the value of an existing variable.
But your antipathy towards the feature is misplaced. Several languages with the most rigorous foundations support shadowing: SML, Ocaml, Haskell, Scheme,
You're probably more familiar with languages that have unrestricted mutation, in which case something much worse than shadowing is allowed: changing the value of an existing variable.