My personal impression from these examples you gave is that line-breaking inside an arithmetic expression is generally a horrible idea. If you have something li

My personal impression from these examples you gave is that line-breaking inside an arithmetic expression is generally a horrible idea. If you have something like let result = (first_long_variable + second_long_variable) * (third_long_variable + fourth_long_variable); My position is that the only way to make this look good under a line length limit is let factor1 = first_long_variable + second_long_variable; let factor2 = third_long_variable + fourth_long_variable; let result = factor1 * factor2; (where of course `factor1` and `factor2` would be given names that make sense in context)