Keep Your Friends under control
summary
Placing a free function as an inline friend inside a class makes it hidden from the enclosing namespace so it is only found by ADL, which cuts the huge list of overloads that usually swamp error messages and slow compilation; the talk shows example error output before and after and claims noticeably smaller diagnostic noise and faster compile in practice. Tradeoff: the function must be inline friend, changing linkage/definition habits. A separate independence of declaration proposal suggests a new keyword to get the same effect without making it inline.
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