Confirmation that authors of Clang are confused about “undefined behavior”. https://godbolt.org/g/1Pcu7g pic.twitter.com/l5tegDE7ZI
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In the sense that they define [0] as an extension (non-conforming since it's a constraint violation, tho) but don't define subtr..
...I think they're justified in saying it's undefined behavior in the context of their extension of the language. Confusing tho.
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