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According to approved syntax at https://github.com/carbon-language/carbon-lang/blob/trunk/proposals/p3848.md#syntax-defined, `fn F[]` without explicit parameters should be valid. This makes it work, then adds some validation to prevent `class C[]` in check. Note that for `fn`, positional parameters are a TODO -- but this allows me to test validation in `fn destroy[]` which is rejected, not just a TODO.