Really looking forward to #embed, once the compilers catch up. Until then, Golang.
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A lot of stuff in the C++11 standard library was based on widespread use of Boost. Since then, I don't know. Also, were things like templates and lambdas implemented as compiler extensions before standardization? I don't know, but I doubt it. Maybe "we're a committee of people who will decide on a thing and we hope you like it" was always the norm in many ways.