An overlooked PL question: what is easy to try in a given language? In lisp it's easy to try adding extra syntax. In Rust it's easy to try parallelism on iterators (rayon).
Are there other examples? Perhaps Perl and regexes or Haskell and STM?
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Today I learnt about clippy::clone_on_ref_ptr, which complains about t.clone() on a Rc<Thing>. You write Rc::clone(t) instead, so it's obvious it's a cheap clone.
It's a nice approach, because it makes the expensive clones more obvious.
It's funny how languages can offer multiple forms of syntax, but formatters standardise to a single form.
E.g. single vs double quotes in JS, optional semicolons in JS, different ways of grouping imports in Rust.
Should new languages be more syntactically opinionated?
Rust and RISC-V both feel like they've reached critical mass and I'd guess that they'll be used more in 5 years than they are today.
What other technologies fit this description?