Say that bare trait objects are rejected in the 2021 edition #1111
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Closes #1070.
This patch leaves the grammar block describing
dyn
as an optional keyword, treating the 2021-edition rejection of missingdyn
as a post-parsing error (which is after all how it's implemented).I think that's consistent with how the grammar works elsewhere: it describes what's allowed in any edition, while the text outside 'Edition Differences' blocks describes what's allowed in all editions.