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Add a warning to proc_macro::Delimiter::None that rustc currently does not respect it. It does not provide the behaviour it is indicated to provide when used in a proc_macro context. This seems to be a bug, (https://github.com/rust-lang/rust/issues/67062), but 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. |
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Cargo.toml |