Typing '<-' is a fairly trivial matter, I think, compared to the semantic issues raised at the start of this thread, and covered in the question and answers below - for example (from the chosen answer): "R's syntax contains many ambiguous cases that have to be resolved one way or another. The parser chooses to resolve the bits of the expression in different orders depending on whether = or <- was used."

https://stackoverflow.com/questions/1741820/assignment-opera...