my favourite* thing about the Ruby parser is how the lexer state changes in a very complex context sensitive way based on which parse node you're in. * I actually hate it
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I used to be neutral on context sensitivity, but these days I'm negative. It always seems harmless, but it makes it harder to explain to users what the program they're looking at should mean -- and the problems accumulate over time. New languages should be context free IMHO.
I'm not sure I agree with this, Rust for example is *almost* context free, but raw string literals are not, and a few keywords were added that needed to be context sensitive (Making it illegal to have a method named `default` would have been bad). Neither make it hard to reason
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I've made plenty of grammars that allow function names to be keywords, so that's not a big problem in general. I'm not sure what the problem with raw string literals in Rust is -- couldn't that be resolved by the/a lexer?
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Scannerless parsing ftw :P
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