Nim also has term rewriting macros (e.g. https://scripter.co/notes/nim/#term-rewriting-macros) which can transform patterns. The relevance is that you could combine that with `||=` to probably get whatever short-circuit|not semantics you want on the RHS. Or also do bignum/matrix libraries where arithmetic can be streamlined (e.g. jumbo operations matched to convert N passes into 1-pass), { at least potentially. Often the scale matters as in fits in "available" L1 then many passes might be more autovec friendly and so faster, or doesn't fit then one pass is much faster. It all depends, etc., etc. }