Comment by zem

their operator precedence system was one of my favourite pieces of language design. the tl;dr was that you could group operators into precedence sets, and an expression involving operators that all came from the same set would have that set's precedence rules applied, but if you had an expression involving mixed sets you needed to add the parentheses. crucially, they also supported operator overloading, and the same operator could be used in a different set as long as everything could be parsed unambiguously. (caveat, I never used the language, I just read about the operator design in the docs and it was very eye opening in the sense that every other language's operator precedence system suddenly felt crude and haphazard)