#golang trick: test whether two structs have the same size at compile time: https://play.golang.org/p/cnaAt-hsTTG
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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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Apparently such checks have been used in the Linux kernel for a long time now: https://elixir.bootlin.com/linux/v4.2/source/include/linux/bug.h#L71 … Makes me think that any new language should have first-class support for compile-time asserts.
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