Add a warning to Delimiter::None
that rustc currently does not respect it.
#455
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Currently when used to implement a proc_macro,
Delimiter::None
simply doesn't do what it is documented to do.While this is a rustc bug (rust-lang/rust#67062), it is a long standing one, and hard to discover.
This pull request adds a warning to inform users of this issue, with a link to the relevant issue, and a version number of the last known affected rustc version.