update to syn-1.0.102

[zertosh]

This update removes the only .gitignore found in rustc-src:

vendor/syn/tests/.gitignore
vendor/syn-1.0.91/tests/.gitignore
vendor/syn-1.0.95/tests/.gitignore

To check-in rustc-src for hermetic builds in environments with
restrictive .gitignore policies, one has to remove these
tests/.gitignore and patch the respective
.cargo-checksum.json.syn >1.0.101 includes dtolnay/syn@3c49303bed7a,
which removes its tests/.gitignore. Now the syn crates.io package
has no .gitignore.

rustc-src's vendor is produced from the root Cargo.toml,
src/tools/rust-analyzer/Cargo.toml,
compiler/rustc_codegen_cranelift/Cargo.toml, and
src/bootstrap/Cargo.toml. rustc_codegen_cranelift does not use
syn.

This was produced with:

cargo update --package syn --precise 1.0.102 \

cargo update --package syn --precise 1.0.102 \
    --manifest-path src/tools/rust-analyzer/Cargo.toml

cargo update --package syn --precise 1.0.102 \
    --manifest-path src/bootstrap/Cargo.toml

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @Mark-Simulacrum (or someone else) soon.

Please see the contribution instructions for more information.

[zertosh]

r? @dtolnay

[zertosh]

I can update src/tools/tidy/src/deps.rs to add unicode-ident to PERMITTED_RUSTC_DEPENDENCIES, but what about the licensing? Permit (MIT OR Apache-2.0) AND Unicode-DFS-2016 or add unicode-indent as an exception?

[dtolnay]

Libcore, and unicode-xid which rustc depends on, both already use the same Unicode tables as unicode-ident, so they already require compliance with Unicode-DFS-2016 despite not stating such in their license metadata in Cargo.toml. Please add Unicode-DFS-2016 as a permitted license.

[dtolnay]

@bors r+

[bors]

📌 Commit a65ddf0 has been approved by dtolnay

It is now in the queue for this repository.

[klensy]

Shouldn't be rolled up in case if perf changes observable in benches (for example https://github.com/dtolnay/proc-macro2/releases/tag/1.0.39, https://github.com/dtolnay/proc-macro2/releases/tag/1.0.42, https://github.com/dtolnay/syn/releases/tag/1.0.95, https://github.com/dtolnay/syn/releases/tag/1.0.102).