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Richard Smith
4b679510e7
Add checking that a type only satisfies a constraint if it satisfies all of that constraint's equality and rewrite constraints. Enforce the rule that `=` must be used in impls when specifying associated constant values rather than `==`. Turn off the pre-#2173 single-step equality behavior. This is getting somewhat ahead of the approved design, but it's a one-line change to restore the old behavior. Fix `CARBON_CHECK` to handle top-level `,`s in its argument, such as may happen in template argument lists, as this change introduces such a check.