ICE: rustfmt: `silent emitter attempted to translate a diagnostic`

[matthiaskrgr]

Code

enum Enum<T: Melon<5>> {  SVariant { _v: T }, UVariant }

type AliasFixed = Enum<()>;

macro_rules! test {
    () => (test!(UVariant));
    ($variant:ident) => (if let AliasFixed::$variant::<3> {} = 5 (PartialEq, Eq, Copy, Clone) else { false });
}

fn main() {
    test!();
}

Meta

rustc --version --verbose:

rustfmt 1.7.0-nightly (0ecbd06 2024-02-25)

Error output

rustfmt --check file.rs

<output>

Backtrace

thread 'main' panicked at src/tools/rustfmt/src/parse/session.rs:42:9:
silent emitter attempted to translate a diagnostic
stack backtrace:
   0:     0x7fc5b718ca06 - std::backtrace_rs::backtrace::libunwind::trace::hccc68910ff13f958
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7fc5b718ca06 - std::backtrace_rs::backtrace::trace_unsynchronized::hdd46fbd3506eaa92
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fc5b718ca06 - std::sys_common::backtrace::_print_fmt::h9ad5ddd930964dc6
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7fc5b718ca06 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hb776b6ec91daeedd
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7fc5b71dd98c - core::fmt::rt::Argument::fmt::h2572fa2911ad0fb3
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/core/src/fmt/rt.rs:142:9
   5:     0x7fc5b71dd98c - core::fmt::write::hff271b7e044cedf7
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/core/src/fmt/mod.rs:1120:17
   6:     0x7fc5b71813cf - std::io::Write::write_fmt::h912c793bec133142
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/io/mod.rs:1846:15
   7:     0x7fc5b718c7b4 - std::sys_common::backtrace::_print::hea0a6eee0651d2b8
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7fc5b718c7b4 - std::sys_common::backtrace::print::h18c37b9b3c9e91a8
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7fc5b718f4fb - std::panicking::default_hook::{{closure}}::h0be5e0bb06f8054c
  10:     0x7fc5b718f249 - std::panicking::default_hook::h4893d748ed70c8dd
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/panicking.rs:292:9
  11:     0x7fc5ba0a083c - std[d552d81111d10822]::panicking::update_hook::<alloc[c9232cf8044bd381]::boxed::Box<rustc_driver_impl[8fe79628258f8a06]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7fc5b718fc60 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h148c64496bcc724c
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/alloc/src/boxed.rs:2030:9
  13:     0x7fc5b718fc60 - std::panicking::rust_panic_with_hook::h18f7fbcd19143e05
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/panicking.rs:783:13
  14:     0x7fc5b718f969 - std::panicking::begin_panic_handler::{{closure}}::h9b1e5e4a583f1a9f
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/panicking.rs:649:13
  15:     0x7fc5b718cee6 - std::sys_common::backtrace::__rust_end_short_backtrace::h5a04e37630d644c0
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7fc5b718f6d4 - rust_begin_unwind
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/panicking.rs:645:5
  17:     0x7fc5b71d9ea5 - core::panicking::panic_fmt::h6be3da941e46ae73
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/core/src/panicking.rs:72:14
  18:     0x5639a018902f - <rustfmt_nightly[8d4f808e9469a8c9]::parse::session::SilentEmitter as rustc_errors[fcee4e46eb3cda72]::translation::Translate>::fallback_fluent_bundle
  19:     0x5639a0104901 - <rustfmt_nightly[8d4f808e9469a8c9]::parse::session::SilentOnIgnoredFilesEmitter as rustc_errors[fcee4e46eb3cda72]::translation::Translate>::translate_message
  20:     0x7fc5b876e520 - <rustc_errors[fcee4e46eb3cda72]::DiagCtxt>::eagerly_translate::<indexmap[9ba59d78c0581370]::map::iter::Iter<alloc[c9232cf8044bd381]::borrow::Cow<str>, rustc_errors[fcee4e46eb3cda72]::diagnostic::DiagnosticArgValue>>
  21:     0x7fc5b8751c34 - <rustc_parse[afc5b6d65a3b334f]::errors::IfExpressionMissingThenBlock as rustc_errors[fcee4e46eb3cda72]::diagnostic::IntoDiagnostic>::into_diagnostic
  22:     0x7fc5bb7a7dd3 - <rustc_parse[afc5b6d65a3b334f]::parser::Parser>::parse_if_after_cond
  23:     0x7fc5bb5da20c - <rustc_parse[afc5b6d65a3b334f]::parser::Parser>::parse_expr_dot_or_call
  24:     0x7fc5bb5d2a6a - <rustc_parse[afc5b6d65a3b334f]::parser::Parser>::parse_expr_prefix
  25:     0x7fc5bb5cf1f6 - <rustc_parse[afc5b6d65a3b334f]::parser::Parser>::parse_expr_assoc_with
  26:     0x7fc5bbac86fc - <rustc_parse[afc5b6d65a3b334f]::parser::Parser>::parse_stmt_without_recovery
  27:     0x7fc5bbac57b6 - <rustc_parse[afc5b6d65a3b334f]::parser::Parser>::parse_block_tail
  28:     0x7fc5bb9f1ef0 - <rustc_parse[afc5b6d65a3b334f]::parser::Parser>::parse_fn
  29:     0x7fc5bbd7f61b - <rustc_parse[afc5b6d65a3b334f]::parser::Parser>::parse_item_kind
  30:     0x7fc5bb7ab1be - <rustc_parse[afc5b6d65a3b334f]::parser::Parser>::parse_item_common
  31:     0x7fc5bb7a8c2a - <rustc_parse[afc5b6d65a3b334f]::parser::Parser>::parse_mod
  32:     0x7fc5bc4e2af1 - <rustc_parse[afc5b6d65a3b334f]::parser::Parser>::parse_crate_mod
  33:     0x5639a0188bdf - <rustfmt_nightly[8d4f808e9469a8c9]::parse::parser::Parser>::parse_crate
  34:     0x5639a01422a4 - <rustfmt_nightly[8d4f808e9469a8c9]::Session<alloc[c9232cf8044bd381]::vec::Vec<u8>>>::format_input_inner::{closure#0}
  35:     0x5639a01b5208 - rustfmt_nightly[8d4f808e9469a8c9]::format_snippet
  36:     0x5639a01b5eb2 - rustfmt_nightly[8d4f808e9469a8c9]::format_code_block
  37:     0x5639a01696b2 - <rustfmt_nightly[8d4f808e9469a8c9]::lists::ListItems<core[bd769e7ba7008c3]::slice::iter::Iter<rustfmt_nightly[8d4f808e9469a8c9]::macros::MacroBranch>, rustfmt_nightly[8d4f808e9469a8c9]::macros::rewrite_macro_def::{closure#1}, rustfmt_nightly[8d4f808e9469a8c9]::macros::rewrite_macro_def::{closure#2}, rustfmt_nightly[8d4f808e9469a8c9]::macros::rewrite_macro_def::{closure#3}> as core[bd769e7ba7008c3]::iter::traits::iterator::Iterator>::next::{closure#0}
  38:     0x5639a016ea23 - rustfmt_nightly[8d4f808e9469a8c9]::macros::rewrite_macro_def
  39:     0x5639a01aa4c5 - <rustfmt_nightly[8d4f808e9469a8c9]::visitor::FmtVisitor>::visit_item
  40:     0x5639a018eae6 - <rustfmt_nightly[8d4f808e9469a8c9]::visitor::FmtVisitor>::visit_items_with_reordering
  41:     0x5639a01ae6cb - <rustfmt_nightly[8d4f808e9469a8c9]::visitor::FmtVisitor>::format_separate_mod
  42:     0x5639a00287be - <rustfmt_nightly[8d4f808e9469a8c9]::Session<std[d552d81111d10822]::io::stdio::Stdout>>::format_input_inner::{closure#0}
  43:     0x5639a003de41 - rustfmt[61a5e1a68eb86e51]::format_and_emit_report::<std[d552d81111d10822]::io::stdio::Stdout>
  44:     0x5639a003c2dc - rustfmt[61a5e1a68eb86e51]::execute
  45:     0x5639a00379ab - rustfmt[61a5e1a68eb86e51]::main
  46:     0x5639a0022083 - std[d552d81111d10822]::sys_common::backtrace::__rust_begin_short_backtrace::<fn(), ()>
  47:     0x5639a0024329 - std[d552d81111d10822]::rt::lang_start::<()>::{closure#0}
  48:     0x7fc5b7171e93 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::hd871a26e604b1b61
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/core/src/ops/function.rs:284:13
  49:     0x7fc5b7171e93 - std::panicking::try::do_call::h8c535df1c0082533
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/panicking.rs:552:40
  50:     0x7fc5b7171e93 - std::panicking::try::hb983a17d8c2d0d25
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/panicking.rs:516:19
  51:     0x7fc5b7171e93 - std::panic::catch_unwind::hc39ef01f5f7bff9a
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/panic.rs:142:14
  52:     0x7fc5b7171e93 - std::rt::lang_start_internal::{{closure}}::h5d0060bca314125e
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/rt.rs:148:48
  53:     0x7fc5b7171e93 - std::panicking::try::do_call::h9eec93bd1b7794e8
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/panicking.rs:552:40
  54:     0x7fc5b7171e93 - std::panicking::try::h4e014b77ab3dfd3d
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/panicking.rs:516:19
  55:     0x7fc5b7171e93 - std::panic::catch_unwind::ha2f220b987d764b1
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/panic.rs:142:14
  56:     0x7fc5b7171e93 - std::rt::lang_start_internal::h55152906ff6b99c9
                               at /rustc/0ecbd0605770f45c9151715e66ba2b3cae367fcb/library/std/src/rt.rs:148:20
  57:     0x5639a003f005 - main
  58:     0x7fc5b6c29d90 - __libc_start_call_main
                               at ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
  59:     0x7fc5b6c29e40 - __libc_start_main_impl
                               at ./csu/../csu/libc-start.c:392:3
  60:     0x5639a00116f9 - <unknown>
  61:                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: please attach the file at `/home/gh-matthiaskrgr/glacier2/fixed/rustc-ice-2024-02-26T15_55_50-1973730.txt` to your bug report

query stack during panic:
end of query stack
Diff in /home/gh-matthiaskrgr/glacier2/fixed/icemaker_omni_4/5FDE66DB04A164775D5E5B8D7E65FD863D3B95DF714FBB75A0D76795307AB1D5.rs at line 1:
-enum Enum<T: Melon<5>> {  SVariant { _v: T }, UVariant }
+enum Enum<T: Melon<5>> {
+    SVariant { _v: T },
+    UVariant,
+}

 type AliasFixed = Enum<()>;

[matthiaskrgr]

This bisects to #121454 , interesting...

[matthiaskrgr]

I'm wondering if there is something broken on how cargo bisect rustc handles components :|

edit: it no werky >:(
rust-lang/cargo-bisect-rustc#321

[matthiaskrgr]

This is probably #121085 cc @davidtwco

[matthiaskrgr]

This seems kinda bad imo since using rustfmt on save, and saving broken code in order to get rustc to update diagnostics in an IDE is not uncommon.
@rustbot prioritize

[DaniPopes]

See rust-lang/rustfmt#6082, #121301

[apiraino]

WG-prioritization assigning priority (Zulip discussion).

@rustbot label -I-prioritize +P-high