panic: unsupported proc macro punctuation character '(' #1186
Description
I have just installed c2rust from git and transpiling fails with following error:
thread 'main' panicked at /home/user/.local/share/cargo/registry/src/index.crates.io-6f17d22bba15001f/proc-macro2-1.0.92/src/lib.rs:849:13:
unsupported proc macro punctuation character '('
stack backtrace:
0: 0x6069e3c0f16a - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h5b6bd5631a6d1f6b
1: 0x6069e3c34c33 - core::fmt::write::h7550c97b06c86515
2: 0x6069e3c0ba13 - std::io::Write::write_fmt::h7b09c64fe0be9c84
3: 0x6069e3c0efb2 - std::sys::backtrace::BacktraceLock::print::h2395ccd2c84ba3aa
4: 0x6069e3c0ff5c - std::panicking::default_hook::{{closure}}::he19d4c7230e07961
5: 0x6069e3c0fda2 - std::panicking::default_hook::hf614597d3c67bbdb
6: 0x6069e3c10537 - std::panicking::rust_panic_with_hook::h8942133a8b252070
7: 0x6069e3c103ca - std::panicking::begin_panic_handler::{{closure}}::hb5f5963570096b29
8: 0x6069e3c0f649 - std::sys::backtrace::__rust_end_short_backtrace::h6208cedc1922feda
9: 0x6069e3c1005c - rust_begin_unwind
10: 0x6069e3659be0 - core::panicking::panic_fmt::h0c3082644d1bf418
11: 0x6069e399e988 - proc_macro2::Punct::new::h23ccf86e5c82a2e4
12: 0x6069e3875d54 - c2rust_ast_builder::builder::Builder::prepare_meta_list::he05251b599441f5d
13: 0x6069e37d6984 - c2rust_ast_builder::builder::Builder::call_attr::h89fed340fc2044b9
14: 0x6069e375873f - c2rust_transpile::translator::Translation::convert_decl::ha4de2c6af1a6f2fd
15: 0x6069e37490b3 - c2rust_transpile::translator::translate::hd37d6a19b41b6157
16: 0x6069e367db01 - c2rust_transpile::transpile_single::h55bb805f8dcf774a
17: 0x6069e379491b - <alloc::vec::Vec<T> as alloc::vec::spec_from_iter::SpecFromIter<T,I>>::from_iter::h38bd6f0653efc8af
18: 0x6069e367a69e - c2rust_transpile::transpile::hd3cb5e6c24830497
19: 0x6069e365f2cd - c2rust_transpile::main::h69f4132a691fdf13
20: 0x6069e3669223 - std::sys::backtrace::__rust_begin_short_backtrace::h4b6bec18d0a6abc1
21: 0x6069e3669219 - std::rt::lang_start::{{closure}}::h87286ab225c02cbc
22: 0x6069e3c06f9e - std::rt::lang_start_internal::h1c66660c99c8424c
23: 0x6069e3663c65 - main
24: 0x73ab86034e08 - <unknown>
25: 0x73ab86034ecc - __libc_start_main
26: 0x6069e365a3a5 - _start
27: 0x0 - <unknown>
dtolnay/proc-macro2@98ea261 introduced a check that panics on '(' which is what is explicitly called here https://github.com/immunant/c2rust/blob/43fb2f8f8e83c0b6e5c4e67b7da7e2f2b329a9d2/c2rust-ast-builder/src/builder.rs#L536C1-L546C11