Because then a missing comma somewhere becomes a weird bug, as opposed to a syntax error. Languages with implicit string concatenation using no operator have f

Because then a missing comma somewhere becomes a weird bug, as opposed to a syntax error. Languages with implicit string concatenation using no operator have found it to be a common source of bugs, eg python. See https://news.ycombinator.com/item?id=29841560 https://news.ycombinator.com/item?id=29841560