[PATCH] D55466: Change `tuple_size` from a `class` to a `struct` (see PR#39871)

[Marshall Clow via Phabricator]

mclow.lists added a comment.

Oh, look, this is https://github.com/cplusplus/draft/issues/534, where JW wrote:

> Compilers do not compile the standard, they compile headers that come with their implementation. The implementation headers can use whatever class-keys they want to, they don't have to match the standard, and changing the standard doesn't mean implementations will change.

I say commit this.


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