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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,
syn
may wrap a type in one or moresyn::Type::Group
s (if the proc-macro input came from amacro_rules!
expansion).I've determined that this can cause
oauth1-request-derive
to fail to matcha
Type::Path
. This PR should properly handle nested groups, allowingyour crate to work with both old and new input.
If you have any questions, feel free to ask me. See rust-lang/rust#72622
for more details.