The meta fragment specifier is considered as a single TT. #34011
Description
At various locations of the FOLLOW sets analysis for macro_rules!, meta is considered as always matching a single TT. This is not the case: ident = ... and ident(...) are both valid metas.
That being said the only consequence of this is that meta can be followed by anything, and I think it's not unreasonable to assume that the syntax of meta will not be expanded in the future... But still, we might want to check that.