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Stabilize `unrestricted_attribute_tokens` #57367
In accordance with a plan described in https://internals.rust-lang.org/t/unrestricted-attribute-tokens-feature-status/8561/3.
Delimited non-macro non-builtin attributes now support the same syntax as macro attributes:
Such attributes mostly serve as inert proc macro helpers or tool attributes.
Key-value non-macro non-builtin attributes are now restricted to bare minimum required to support what we support on stable - unsuffixed literals (#34981).
(Key-value macro attributes are not supported at all right now.)
Built-in attributes are still restricted to the "classic" meta-item syntax, nothing changes here.
referenced this pull request
Jan 6, 2019
Minor note: it might make sense to frame this not as "stabilizing
So my "suggestion" is to make the stabilized subset stable under