(You can also use this to test whether the size of a type is equal to some other constant, e.g. var _ [42]struct{} = ...)
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#golang trick: test whether two structs have the same size at compile time: https://play.golang.org/p/cnaAt-hsTTG
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Oh, and you can ensure that one constant is larger than another: https://play.golang.org/p/3nCyCuM_D_b
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HA! I felt that there must be some way to check arbitrary boolean conditions at compile-time, and it finally dawned on me: duplicate map initializers! https://play.golang.org/p/n8NJyx4yDAR It ain't pretty, but you can use this to assert any condition involving values known at compile-time!
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(In other words, both of the previous tricks I posted can be expressed in terms of this one -- it's a generalized form that can check any boolean expression.)
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Compile-time assertion that a constant is a power of 2: var _ [0]struct{} = [c & (c - 1)]struct{}{}
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End of conversation
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