Handle Groups with Delimiter::None
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Currently, rustc does not pass the exact original `TokenStream` to proc-macros in several cases. This has many undesirable effects, such as losing correct location information in error message. See rust-lang/rust#43081 for more details In the future, rustc will begin passing the correct `TokenStream` to proc-macros. As a result, some tokens may be wrapped in a `TokenTree::Group` with `Delimiter::None` (when the tokens originally came from a `macro_rules!`) macro expansion. I've determined that this change will cause your crate to stop working on some inputs. This PR updates `hex-literal-impl` to be compatible with both the old and new `TokenStream` contents. If you have any questions, feel free to ask me. See rust-lang/rust#72622 for more details
tarcieri
approved these changes
May 31, 2020
newpavlov
approved these changes
Jun 1, 2020
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@Aaron1011 |
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@newpavlov Newer versions of rust have stopped wrapping |
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Currently, rustc does not pass the exact original
TokenStreamtoproc-macros in several cases. This has many undesirable effects, such as
losing correct location information in error message.
See rust-lang/rust#43081 for more details
In the future, rustc will begin passing the correct
TokenStreamtoproc-macros. As a result, some tokens may be wrapped in a
TokenTree::GroupwithDelimiter::None(when the tokens originallycame from a
macro_rules!) macro expansion.I've determined that this change will cause your crate to stop working
on some inputs. This PR updates
hex-literal-implto be compatible with both theold and new
TokenStreamcontents.If you have any questions, feel free to ask me. See rust-lang/rust#72622 for more details