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Regression: .format from itertools started runtime panicking with rustc 1.71.0 #110717
Description
Code
I tried this code:
use itertools::Itertools;
fn main() {
let mut v = Vec::new();
v.push("foo");
assert!(
v.is_empty(),
"{}",
v.iter().format(", "),
);
}I expected to see this happen: No panic during runtime
Instead, this happened: Panicked during runtime
Format: was already formatted once
thread 'main' panicked at 'thread 'main' panicked at 'Format: was already formatted once', /playground/.cargo/registry/src/index.crates.io-6f17d22bba15001f/itertools-0.10.5/src/format.rs:81:21
stack backtrace:
0: 0x55575722e373 - std::backtrace_rs::backtrace::libunwind::trace::hb9265895128f1f9c
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
1: 0x55575722e373 - std::backtrace_rs::backtrace::trace_unsynchronized::h028901cb3a0224b1
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x55575722e373 - std::sys_common::backtrace::_print_fmt::hfa5c37f64d314fee
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys_common/backtrace.rs:65:5
3: 0x55575722e373 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h5b30f1684e8bd3e6
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys_common/backtrace.rs:44:22
4: 0x55575724982f - core::fmt::write::h997ecd0e22e2af7a
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/core/src/fmt/mod.rs:1247:17
5: 0x55575722c621 - std::io::Write::write_fmt::h291317e85b978e13
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/io/mod.rs:1698:15
6: 0x55575722e185 - std::sys_common::backtrace::_print::h0133b24def7b99d9
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys_common/backtrace.rs:47:5
7: 0x55575722e185 - std::sys_common::backtrace::print::h4a42174c7f3bd207
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys_common/backtrace.rs:34:9
8: 0x55575722f4ff - std::panicking::default_hook::{{closure}}::h0847452fe926d6e5
9: 0x55575722f1b7 - std::panicking::default_hook::hbcdd7833994c05d0
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:293:9
10: 0x55575722fa21 - std::panicking::rust_panic_with_hook::hb55c52c8e21298f0
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:700:13
11: 0x555757215394 - std::panicking::begin_panic::{{closure}}::hb08efbb470f664d6
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:624:9
12: 0x5557572152bd - std::sys_common::backtrace::__rust_end_short_backtrace::hbf8634da0334b4e2
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys_common/backtrace.rs:150:18
13: 0x555757215307 - std::panicking::begin_panic::h61b21b87c2e55e8f
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:623:12
14: 0x555757214cdb - itertools::format::Format<I>::format::heb0f74abc06f4991
at /playground/.cargo/registry/src/index.crates.io-6f17d22bba15001f/itertools-0.10.5/src/format.rs:81:21
15: 0x5557572149b3 - <itertools::format::Format<I> as core::fmt::Display>::fmt::h064530a6ea8ffcbf
at /playground/.cargo/registry/src/index.crates.io-6f17d22bba15001f/itertools-0.10.5/src/format.rs:105:21
16: 0x55575724982f - core::fmt::write::h997ecd0e22e2af7a
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/core/src/fmt/mod.rs:1247:17
17: 0x55575724982f - core::fmt::write::h997ecd0e22e2af7a
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/core/src/fmt/mod.rs:1247:17
18: 0x55575722c621 - std::io::Write::write_fmt::h291317e85b978e13
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/io/mod.rs:1698:15
19: 0x55575722f3b3 - std::panicking::default_hook::{{closure}}::h0847452fe926d6e5
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:255:21
20: 0x55575722f1b7 - std::panicking::default_hook::hbcdd7833994c05d0
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:293:9
21: 0x55575722fa21 - std::panicking::rust_panic_with_hook::hb55c52c8e21298f0
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:700:13
22: 0x55575722f913 - std::panicking::begin_panic_handler::{{closure}}::h51ad0ee3ee1b4d02
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:595:13
23: 0x55575722e7b6 - std::sys_common::backtrace::__rust_end_short_backtrace::hd1006853c72eedaf
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys_common/backtrace.rs:150:18
24: 0x55575722f612 - rust_begin_unwind
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:584:5
25: 0x555757212ed3 - core::panicking::panic_fmt::h0405aceea833a54b
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/core/src/panicking.rs:67:14
26: 0x555757213f7f - core::panicking::panic_display::he369e4705b14dda4
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/core/src/panicking.rs:150:5
27: 0x555757215201 - playground::main::hed8c86f138364518
at /playground/src/main.rs:5:5
28: 0x5557572137db - core::ops::function::FnOnce::call_once::hbebd13fb81ee85e2
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/core/src/ops/function.rs:250:5
29: 0x5557572134ee - std::sys_common::backtrace::__rust_begin_short_backtrace::h8be5514a066de9a8
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys_common/backtrace.rs:134:18
30: 0x555757213561 - std::rt::lang_start::{{closure}}::h283d7d606f728596
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/rt.rs:166:18
31: 0x55575722a432 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::ha628a292c7e4d1fe
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/core/src/ops/function.rs:284:13
32: 0x55575722a432 - std::panicking::try::do_call::haef2b0ee78305734
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:490:40
33: 0x55575722a432 - std::panicking::try::h18b79ccaa1dcd46e
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:454:19
34: 0x55575722a432 - std::panic::catch_unwind::h44fa38099b98dbce
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panic.rs:140:14
35: 0x55575722a432 - std::rt::lang_start_internal::{{closure}}::h90d1d020380fa86c
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/rt.rs:148:48
36: 0x55575722a432 - std::panicking::try::do_call::h96eb402652927015
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:490:40
37: 0x55575722a432 - std::panicking::try::h9ac5ba472c3806a8
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:454:19
38: 0x55575722a432 - std::panic::catch_unwind::ha6f72383b6160344
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panic.rs:140:14
39: 0x55575722a432 - std::rt::lang_start_internal::hc00ff9425137690f
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/rt.rs:148:20
40: 0x55575721353a - std::rt::lang_start::hf0c3703aafa2e063
at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/rt.rs:165:17
41: 0x55575721523e - main
42: 0x7f45f2cf9083 - __libc_start_main
43: 0x55575721340e - _start
44: 0x0 - <unknown>
thread panicked while panicking. aborting.
timeout: the monitored command dumped core
Version it worked on
It most recently worked on: Rust 1.70 (beta) and Rust 1.69 (stable)
Version with regression
rustc --version --verbose:
rustc 1.71.0-nightly (b628260df 2023-04-22)
binary: rustc
commit-hash: b628260df0587ae559253d8640ecb8738d3de613
commit-date: 2023-04-22
host: x86_64-unknown-linux-gnu
release: 1.71.0-nightly
LLVM version: 16.0.2
Backtrace
None
Other
I also reported this here rust-itertools/itertools#694, but I think this one is on rustc.
@m-ou-se assigning you, because I suspect this has something to do with recent format_args! changes.
Activity
m-ou-se commentedon Apr 23, 2023
I'll look into this tomorrow.
Can you check if it also happens with -Zflatten-format-args=no?
lukas-code commentedon Apr 23, 2023
This is unrelated to
format_args!and was caused by a recent change to the panic runtime. I've posted a fix at #110721.Rollup merge of rust-lang#110721 - lukas-code:panic-fmt, r=Amanieu
Rollup merge of rust-lang#110721 - lukas-code:panic-fmt, r=Amanieu
Rollup merge of rust-lang#110721 - lukas-code:panic-fmt, r=Amanieu
Rollup merge of rust-lang#110721 - lukas-code:panic-fmt, r=Amanieu