A bunch of diagnostics polish in clang 10: https://releases.llvm.org/10.0.0/tools/clang/docs/ReleaseNotes.html
One particularly cute addition: spotting that 2 ^ 10 is the user confusing exponentiation with xor!
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Designing UIs is such a hard problem.
Sometimes I try a bunch of options and I settle on "this one seems the least annoying".
I'm trying to decide what program I should show on the home page of my PL.
Hello World is too simple to show much syntax. Fibonacci is OK but the reader may not know what print(fib(10)) should show.
Maybe print(greet("World")) is better? It gives you a function definition at least.
One cute feature of markdown I'd not noticed before: there's no syntax for images *without* a description (i.e. alt text).
https://spec.commonmark.org/0.31.2/#images