Description
auto-reduced (treereduce-rust):
macro_rules! one_rep {
( $($a:ident)* ) => {
A(
const ${concat($a, Z)}: i32 = 3;
)*
};
}
fn main() {
one_rep!(A B C);
}
original:
#![feature(macro_metavar_expr_concat)]
macro_rules! one_rep {
( $($a:ident)* ) => {
A(
const ${concat($a, Z)}: i32 = 3;
)*
};
}
fn main() {
one_rep!(A B C);
assert_eq!(AZ, 3);
assert_eq!{
$(
const ${concat($a, Z)}: i32 = 3;
)*
};
assert_eq!(CZ, 3);
}Version information
rustc 1.82.0-nightly (a5ee5cbad 2024-07-29)
binary: rustc
commit-hash: a5ee5cbad1dde83dde61959e9436716094e3408c
commit-date: 2024-07-29
host: x86_64-unknown-linux-gnu
release: 1.82.0-nightly
LLVM version: 18.1.7
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc
Program output
error[E0658]: the `concat` meta-variable expression is unstable
--> /tmp/icemaker_global_tempdir.FDR6hVZZQzAl/rustc_testrunner_tmpdir_reporting.TfJpwWG3aR5f/mvce.rs:4:20
|
4 | const ${concat($a, Z)}: i32 = 3;
| ^^^^^^^^^^^^^^^
|
= note: see issue #124225 <https://github.com/rust-lang/rust/issues/124225> for more information
= help: add `#![feature(macro_metavar_expr_concat)]` to the crate attributes to enable
= note: this compiler was built on 2024-07-29; consider upgrading it if it is out of date
thread 'rustc' panicked at compiler/rustc_expand/src/mbe/transcribe.rs:698:63:
called `Option::unwrap()` on a `None` value
stack backtrace:
0: 0x796dd2857055 - std::backtrace_rs::backtrace::libunwind::trace::h5200c2caec84f42d
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
1: 0x796dd2857055 - std::backtrace_rs::backtrace::trace_unsynchronized::he7c3f8fab4bfbd07
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x796dd2857055 - std::sys::backtrace::_print_fmt::hd631a028372816d9
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/std/src/sys/backtrace.rs:66:9
3: 0x796dd2857055 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::he0a1eeb2110733a8
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/std/src/sys/backtrace.rs:39:26
4: 0x796dd28a7f2b - core::fmt::rt::Argument::fmt::h5f59e0ff9c29f201
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/core/src/fmt/rt.rs:173:76
5: 0x796dd28a7f2b - core::fmt::write::h40fd57865b73e8d1
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/core/src/fmt/mod.rs:1178:21
6: 0x796dd284b94f - std::io::Write::write_fmt::ha91da9d1116ba39c
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/std/src/io/mod.rs:1823:15
7: 0x796dd28598f1 - std::sys::backtrace::BacktraceLock::print::h5bc1e8aea4432fca
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/std/src/sys/backtrace.rs:42:9
8: 0x796dd28598f1 - std::panicking::default_hook::{{closure}}::h7ac8a47d098eca56
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/std/src/panicking.rs:266:22
9: 0x796dd28595cc - std::panicking::default_hook::h23ba2c1fd8c8a801
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/std/src/panicking.rs:293:9
10: 0x796dcec39279 - std[ccabb9a6d43d485f]::panicking::update_hook::<alloc[f8f6e0ead239af4d]::boxed::Box<rustc_driver_impl[31237189629bb2ae]::install_ice_hook::{closure#0}>>::{closure#0}
11: 0x796dd285a2bf - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h01ae6a2308bc025d
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/alloc/src/boxed.rs:2162:9
12: 0x796dd285a2bf - std::panicking::rust_panic_with_hook::ha5fda6924ae6df7c
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/std/src/panicking.rs:805:13
13: 0x796dd2859eb3 - std::panicking::begin_panic_handler::{{closure}}::h30d298a80e866e15
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/std/src/panicking.rs:664:13
14: 0x796dd2857519 - std::sys::backtrace::__rust_end_short_backtrace::hb93e9e8450183be8
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/std/src/sys/backtrace.rs:170:18
15: 0x796dd2859b74 - rust_begin_unwind
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/std/src/panicking.rs:662:5
16: 0x796dd28a44f3 - core::panicking::panic_fmt::h1f4e0c5152ffe5e0
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/core/src/panicking.rs:74:14
17: 0x796dd28a457c - core::panicking::panic::h16d496a9254bba48
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/core/src/panicking.rs:148:5
18: 0x796dd28a42e9 - core::option::unwrap_failed::h2566b8f64654f995
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/core/src/option.rs:2017:5
19: 0x796dcc860028 - <rustc_expand[34e14bfb072448c]::expand::MacroExpander>::fully_expand_fragment
20: 0x796dd0cc87d8 - <rustc_expand[34e14bfb072448c]::expand::MacroExpander>::expand_crate
21: 0x796dd05746f3 - rustc_interface[539f3934048b9842]::passes::resolver_for_lowering_raw
22: 0x796dd0573cb1 - rustc_query_impl[bbbbf68942f8fd9d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[bbbbf68942f8fd9d]::query_impl::resolver_for_lowering_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[cb63de5e900177d3]::query::erase::Erased<[u8; 16usize]>>
23: 0x796dd0573c9f - <rustc_query_impl[bbbbf68942f8fd9d]::query_impl::resolver_for_lowering_raw::dynamic_query::{closure#2} as core[52a599b2714c5040]::ops::function::FnOnce<(rustc_middle[cb63de5e900177d3]::ty::context::TyCtxt, ())>>::call_once
24: 0x796dd107215d - rustc_query_system[85ec09cc279e17de]::query::plumbing::try_execute_query::<rustc_query_impl[bbbbf68942f8fd9d]::DynamicConfig<rustc_query_system[85ec09cc279e17de]::query::caches::SingleCache<rustc_middle[cb63de5e900177d3]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[bbbbf68942f8fd9d]::plumbing::QueryCtxt, false>
25: 0x796dd1071df7 - rustc_query_impl[bbbbf68942f8fd9d]::query_impl::resolver_for_lowering_raw::get_query_non_incr::__rust_end_short_backtrace
26: 0x796dd0f45963 - rustc_interface[539f3934048b9842]::interface::run_compiler::<core[52a599b2714c5040]::result::Result<(), rustc_span[155dece38b7eea75]::ErrorGuaranteed>, rustc_driver_impl[31237189629bb2ae]::run_compiler::{closure#0}>::{closure#1}
27: 0x796dd0f1be89 - std[ccabb9a6d43d485f]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[539f3934048b9842]::util::run_in_thread_with_globals<rustc_interface[539f3934048b9842]::util::run_in_thread_pool_with_globals<rustc_interface[539f3934048b9842]::interface::run_compiler<core[52a599b2714c5040]::result::Result<(), rustc_span[155dece38b7eea75]::ErrorGuaranteed>, rustc_driver_impl[31237189629bb2ae]::run_compiler::{closure#0}>::{closure#1}, core[52a599b2714c5040]::result::Result<(), rustc_span[155dece38b7eea75]::ErrorGuaranteed>>::{closure#0}, core[52a599b2714c5040]::result::Result<(), rustc_span[155dece38b7eea75]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[52a599b2714c5040]::result::Result<(), rustc_span[155dece38b7eea75]::ErrorGuaranteed>>
28: 0x796dd0f1bc3a - <<std[ccabb9a6d43d485f]::thread::Builder>::spawn_unchecked_<rustc_interface[539f3934048b9842]::util::run_in_thread_with_globals<rustc_interface[539f3934048b9842]::util::run_in_thread_pool_with_globals<rustc_interface[539f3934048b9842]::interface::run_compiler<core[52a599b2714c5040]::result::Result<(), rustc_span[155dece38b7eea75]::ErrorGuaranteed>, rustc_driver_impl[31237189629bb2ae]::run_compiler::{closure#0}>::{closure#1}, core[52a599b2714c5040]::result::Result<(), rustc_span[155dece38b7eea75]::ErrorGuaranteed>>::{closure#0}, core[52a599b2714c5040]::result::Result<(), rustc_span[155dece38b7eea75]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[52a599b2714c5040]::result::Result<(), rustc_span[155dece38b7eea75]::ErrorGuaranteed>>::{closure#1} as core[52a599b2714c5040]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
29: 0x796dd286420b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h4c8f9bb98b743875
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/alloc/src/boxed.rs:2148:9
30: 0x796dd286420b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h2598fa8752cf32b5
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/alloc/src/boxed.rs:2148:9
31: 0x796dd286420b - std::sys::pal::unix::thread::Thread::new::thread_start::hcc536d54f273dcc2
at /rustc/a5ee5cbad1dde83dde61959e9436716094e3408c/library/std/src/sys/pal/unix/thread.rs:105:17
32: 0x796dd25f7ded - <unknown>
33: 0x796dd267b0dc - <unknown>
34: 0x0 - <unknown>
error: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md
note: please make sure that you have updated to the latest nightly
note: rustc 1.82.0-nightly (a5ee5cbad 2024-07-29) running on x86_64-unknown-linux-gnu
query stack during panic:
#0 [resolver_for_lowering_raw] getting the resolver for lowering
end of query stack
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0658`.
@rustbot label +F-macro_metavar_expr_concat