ICE: glacier/fixed/19064.rs -Zunpretty=thir-tree

[matthiaskrgr]

Code

code from glacier/fixed/19064.rs

struct Foo(pub str);

impl Foo {
    fn print(&self) {
        match self {
            &Foo(ref s)  => println!("f\"{}\"", s),
        }
    }
}

fn main() {}

Meta

searched nightlies: from nightly-2021-05-18 to nightly-2021-05-20
regressed nightly: nightly-2021-05-20
searched commits: from 4e3e6db to f94942d
regressed commit: f94942d

bisected with cargo-bisect-rustc v0.6.0

Host triple: x86_64-unknown-linux-gnu
Reproduce with:

cargo bisect-rustc --test-dir=/home/matthias/vcs/github/rust_bisect/foo --start=2021-05-18 --end=2021-05-20

Error output

rustc ./19064.rs -Zunpretty=thir-tree

warning: struct is never constructed: `Foo`
 --> ./19064.rs:1:8
  |
1 | struct Foo(pub str);
  |        ^^^
  |
  = note: `#[warn(dead_code)]` on by default

warning: associated function is never used: `print`
 --> ./19064.rs:4:8
  |
4 |     fn print(&self) {
  |        ^^^^^

thread 'rustc' panicked at 'not yet implemented', compiler/rustc_driver/src/pretty.rs:492:13
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: internal compiler error: unexpected panic

note: 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: rustc 1.54.0-nightly (fc81ad22c 2021-05-21) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z unpretty=thir-tree

query stack during panic:
end of query stack
warning: 2 warnings emitted

Backtrace

thread 'rustc' panicked at 'not yet implemented', compiler/rustc_driver/src/pretty.rs:492:13
stack backtrace:
   0:     0x7f8802967060 - std::backtrace_rs::backtrace::libunwind::trace::h1037ca7e6eeef65c
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
   1:     0x7f8802967060 - std::backtrace_rs::backtrace::trace_unsynchronized::haaefac1bc3669450
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f8802967060 - std::sys_common::backtrace::_print_fmt::h863a6f5e6d995885
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7f8802967060 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h767e17e1aa7df6a8
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/std/src/sys_common/backtrace.rs:46:22
   4:     0x7f88029d4a8c - core::fmt::write::h7aa6cd0067dca82a
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/core/src/fmt/mod.rs:1110:17
   5:     0x7f88029588e5 - std::io::Write::write_fmt::h4c802b6f761026c1
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/std/src/io/mod.rs:1584:15
   6:     0x7f880296aebb - std::sys_common::backtrace::_print::h2769edb26a7eb606
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/std/src/sys_common/backtrace.rs:49:5
   7:     0x7f880296aebb - std::sys_common::backtrace::print::ha71f3549862b4cb6
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/std/src/sys_common/backtrace.rs:36:9
   8:     0x7f880296aebb - std::panicking::default_hook::{{closure}}::h95488a3bade217f6
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/std/src/panicking.rs:208:50
   9:     0x7f880296a991 - std::panicking::default_hook::h290aa602c0fb11df
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/std/src/panicking.rs:225:9
  10:     0x7f880313a03d - rustc_driver::report_ice::hd575aa67be3288bc
  11:     0x7f880296b6c6 - std::panicking::rust_panic_with_hook::hf32c4fa635e215f2
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/std/src/panicking.rs:626:17
  12:     0x7f880296b177 - std::panicking::begin_panic_handler::{{closure}}::h95197ccd88846f7a
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/std/src/panicking.rs:517:13
  13:     0x7f880296753c - std::sys_common::backtrace::__rust_end_short_backtrace::h7641df9566f7b7d0
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/std/src/sys_common/backtrace.rs:141:18
  14:     0x7f880296b109 - rust_begin_unwind
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/std/src/panicking.rs:515:5
  15:     0x7f8802936081 - core::panicking::panic_fmt::hbe99dddd3092ba3c
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/core/src/panicking.rs:92:14
  16:     0x7f8802935fcd - core::panicking::panic::h3de4db67bd397eb3
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/core/src/panicking.rs:50:5
  17:     0x7f8803143e5c - rustc_driver::pretty::print_after_hir_lowering::hef45df26339fcb46
  18:     0x7f880316419c - rustc_interface::passes::QueryContext::enter::h521d1cfc88cc4da1
  19:     0x7f8804c3ce23 - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::h460c5796e582efcd
  20:     0x7f8804c392ec - rustc_span::with_source_map::h5b1831a7c490d4e1
  21:     0x7f8804c3c308 - scoped_tls::ScopedKey<T>::set::ha23e3ea5e8121f7a
  22:     0x7f8804c610fb - std::sys_common::backtrace::__rust_begin_short_backtrace::h547c89617ab570d2
  23:     0x7f8804c37ff5 - core::ops::function::FnOnce::call_once{{vtable.shim}}::he4ef2418a213a503
  24:     0x7f8802977bb7 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h902e2cf6655e1b0c
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/alloc/src/boxed.rs:1575:9
  25:     0x7f8802977bb7 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h893a5452154309d1
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/alloc/src/boxed.rs:1575:9
  26:     0x7f8802977bb7 - std::sys::unix::thread::Thread::new::thread_start::hdedcb57c96ab37cd
                               at /rustc/fc81ad22c453776de16acf9938976930cf8c9401/library/std/src/sys/unix/thread.rs:71:17
  27:     0x7f8802885299 - start_thread
  28:     0x7f880279a053 - clone
  29:                0x0 - <unknown>

error: internal compiler error: unexpected panic

note: 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: rustc 1.54.0-nightly (fc81ad22c 2021-05-21) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z unpretty=thir-tree

query stack during panic:
end of query stack
warning: 2 warnings emitted

[matthiaskrgr]

cc @LeSeulArtichaut looks like this was caused by #83842 ?

[PatchMixolydic]

cc rust-lang/project-thir-unsafeck#8

[LeSeulArtichaut]

Yes, this was expected. I will work on fixing this when #85273 is merged.