compiler panic on trailing whitespace with await.

Question

compiler panic on trailing whitespace with await.

Closed this issue a month ago · 1 comments

Today with cargo fmt I got error: the compiler unexpectedly panicked. this is a bug.

I've managed to narrow the offending code down to this.

With whitespace at the end of the long line, it panics
WIthout whitespace at the end of the long line, it does not panic

pub async fn save() {
    // update the status to read complete
    pg_execute!(
        (SELECT MAX(COALESCE(post_lnid, 0)) + 1 FROM intake_silo.postΔ WHERE post_uuid = $post_uuid), 
        $identity_uuid_principal,
    )
    .await
}

Steps to reproduce:

create a new cargo project (cargo new)
past the above code into src/main.rs
run cargo fmt

Observations:

there must be trailing whitespace on the (SELECT ...) line order to trigger the panic.
Also, if you remove the .await, there is no panic, even WITH trailing whitespace.

Here is the output on the terminal.

This happened with rust 1.82 and rust 1.83 with no discernible differences. The following is from 1.83.

jason@iron:~/code/acp7r/tmp$ cargo fmt
thread 'main' panicked at /rust/deps/annotate-snippets-0.9.2/src/display_list/from_snippet.rs:275:9:
SourceAnnotation range `(102, 103)` is bigger than source length `102`
stack backtrace:
   0:     0x773a40ede035 - std::backtrace_rs::backtrace::libunwind::trace::h1a07e5dba0da0cd2
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x773a40ede035 - std::backtrace_rs::backtrace::trace_unsynchronized::h61b9b8394328c0bc
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x773a40ede035 - std::sys_common::backtrace::_print_fmt::h1c5e18b460934cff
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x773a40ede035 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h1e1a1972118942ad
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x773a40f2d29b - core::fmt::rt::Argument::fmt::h07af2b4071d536cd
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/core/src/fmt/rt.rs:165:63
   5:     0x773a40f2d29b - core::fmt::write::hc090a2ffd6b28c4a
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/core/src/fmt/mod.rs:1157:21
   6:     0x773a40ed2bdf - std::io::Write::write_fmt::h8898bac6ff039a23
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/io/mod.rs:1832:15
   7:     0x773a40edde0e - std::sys_common::backtrace::_print::h4e80c5803d4ee35b
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x773a40edde0e - std::sys_common::backtrace::print::ha96650907276675e
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x773a40ee0779 - std::panicking::default_hook::{{closure}}::h215c2a0a8346e0e0
  10:     0x773a40ee04bd - std::panicking::default_hook::h207342be97478370
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/panicking.rs:298:9
  11:     0x773a3da891b7 - std[3c8ba8ebcf555201]::panicking::update_hook::<alloc[bfbae7e348dce413]::boxed::Box<rustc_driver_impl[c88438ade88661f4]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x773a40ee0e76 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::ha9c3bc81d312fd83
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/alloc/src/boxed.rs:2036:9
  13:     0x773a40ee0e76 - std::panicking::rust_panic_with_hook::hac8bdceee1e4fe2c
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/panicking.rs:799:13
  14:     0x773a40ee0c24 - std::panicking::begin_panic_handler::{{closure}}::h00d785e82757ce3c
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/panicking.rs:664:13
  15:     0x773a40ede4f9 - std::sys_common::backtrace::__rust_end_short_backtrace::h1628d957bcd06996
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x773a40ee0957 - rust_begin_unwind
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/panicking.rs:652:5
  17:     0x773a40f29763 - core::panicking::panic_fmt::hdc63834ffaaefae5
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/core/src/panicking.rs:72:14
  18:     0x566bc7215041 - <annotate_snippets[e2773213b0964fb2]::display_list::structs::DisplayList as core[868bc93c3f2beb33]::convert::From<annotate_snippets[e2773213b0964fb2]::snippet::Snippet>>::from
  19:     0x566bc71053bc - <rustfmt_nightly[ec1e3a417b7a99d0]::format_report_formatter::FormatReportFormatter as core[868bc93c3f2beb33]::fmt::Display>::fmt
  20:     0x773a40f2d29b - core::fmt::rt::Argument::fmt::h07af2b4071d536cd
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/core/src/fmt/rt.rs:165:63
  21:     0x773a40f2d29b - core::fmt::write::hc090a2ffd6b28c4a
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/core/src/fmt/mod.rs:1157:21
  22:     0x773a40ed0c5c - std::io::Write::write_fmt::hb4c7923c70035f80
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/io/mod.rs:1832:15
  23:     0x773a40ed0c5c - <&std::io::stdio::Stderr as std::io::Write>::write_fmt::h6886897ec26c96ae
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/io/stdio.rs:1019:9
  24:     0x773a40ed1578 - <std::io::stdio::Stderr as std::io::Write>::write_fmt::h8648e0d9e692118a
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/io/stdio.rs:993:9
  25:     0x773a40ed1578 - std::io::stdio::print_to::he950b71e4e858b6c
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/io/stdio.rs:1117:21
  26:     0x773a40ed1578 - std::io::stdio::_eprint::hfc8d776e0f0e2b9a
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/io/stdio.rs:1205:5
  27:     0x566bc70056b3 - rustfmt[ab00213afa755e1c]::format_and_emit_report::<std[3c8ba8ebcf555201]::io::stdio::Stdout>
  28:     0x566bc70037fd - rustfmt[ab00213afa755e1c]::execute
  29:     0x566bc6fff5ae - rustfmt[ab00213afa755e1c]::main
  30:     0x566bc6feae03 - std[3c8ba8ebcf555201]::sys_common::backtrace::__rust_begin_short_backtrace::<fn(), ()>
  31:     0x566bc6fed189 - std[3c8ba8ebcf555201]::rt::lang_start::<()>::{closure#0}
  32:     0x773a40ec2cb0 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h6abeee5a7794ceb5
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/core/src/ops/function.rs:284:13
  33:     0x773a40ec2cb0 - std::panicking::try::do_call::hd6e966bb06877057
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/panicking.rs:559:40
  34:     0x773a40ec2cb0 - std::panicking::try::hc9b3807f5768cb19
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/panicking.rs:523:19
  35:     0x773a40ec2cb0 - std::panic::catch_unwind::h94a757c154076c6e
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/panic.rs:149:14
  36:     0x773a40ec2cb0 - std::rt::lang_start_internal::{{closure}}::hc5223fb36050c743
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/rt.rs:141:48
  37:     0x773a40ec2cb0 - std::panicking::try::do_call::hddf7b4e1ebeb3f69
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/panicking.rs:559:40
  38:     0x773a40ec2cb0 - std::panicking::try::h1842860a1f941a31
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/panicking.rs:523:19
  39:     0x773a40ec2cb0 - std::panic::catch_unwind::h009016ccf811d4c3
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/panic.rs:149:14
  40:     0x773a40ec2cb0 - std::rt::lang_start_internal::h3ed4fe7b2f419135
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/rt.rs:141:20
  41:     0x566bc7006685 - main
  42:     0x773a3a829d90 - __libc_start_call_main
                               at ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
  43:     0x773a3a829e40 - __libc_start_main_impl
                               at ./csu/../csu/libc-start.c:392:3
  44:     0x566bc6fd9a19 - <unknown>
  45:                0x0 - <unknown>

error: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rustfmt/issues/new?labels=bug

note: rustc 1.79.0 (129f3b996 2024-06-10) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack

Answer 1 · 2024-12-01T22:54:59.000Z

This is a duplicate of #5888, #5876, and other related issues. Like those other issues the presence of a unicode character (in this case Δ) is causing an issue when rustfmt goes to report a trailing whitespace error. There's a chance that #6391 resolves this.