ICE: assertion failed: bpos.to_u32() >= mbc.pos.to_u32() + mbc.bytes as u32

[matthiaskrgr]

auto-reduced (treereduce-rust):

fn main() {
    let RangeToInclusive: u8 ➖= 1; 
    
     
    
     
    let _ = c;
}

original:

fn main() {
    let RangeToInclusive: u8 ➖= 1; //~ ERROR can't reassign to an uninitialized variable
    let _ = A72;
    let b += 1; //~ ERROR can't reassign to an uninitialized variable
    let _ = test_elseif_panic;
    let c *= 1; //~ ERROR can't reassign to an uninitialized variable
    let _ = c;
}

Version information

rustc 1.82.0-nightly (2048386fe 2024-08-08)
binary: rustc
commit-hash: 2048386fe2898febe7315c0feb915458e41c7aa5
commit-date: 2024-08-08
host: x86_64-unknown-linux-gnu
release: 1.82.0-nightly
LLVM version: 19.1.0

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc

Program output

error: unknown start of token: \u{2796}
 --> /tmp/icemaker_global_tempdir.Em76PNRIxxYR/rustc_testrunner_tmpdir_reporting.gVRjreTFFets/mvce.rs:2:30
  |
2 |     let RangeToInclusive: u8 ➖= 1; 
  |                              ^^
  |
help: Unicode character '➖' (Heavy Minus Sign) looks like '-' (Minus/Hyphen), but it is not
  |
2 |     let RangeToInclusive: u8 -= 1; 
  |                              ~

error: can't reassign to an uninitialized variable
 --> /tmp/icemaker_global_tempdir.Em76PNRIxxYR/rustc_testrunner_tmpdir_reporting.gVRjreTFFets/mvce.rs:2:30
  |
2 |     let RangeToInclusive: u8 ➖= 1; 
  |                              ^^^
  |
  = help: if you meant to overwrite, remove the `let` binding
thread 'rustc' panicked at compiler/rustc_span/src/lib.rs:2028:17:
assertion failed: bpos.to_u32() >= mbc.pos.to_u32() + mbc.bytes as u32
stack backtrace:
   0:     0x7e34f1ca3b0d - std::backtrace_rs::backtrace::libunwind::trace::h288a87c5e2679186
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
   1:     0x7e34f1ca3b0d - std::backtrace_rs::backtrace::trace_unsynchronized::h5284ad94e8c74688
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7e34f1ca3b0d - std::sys::backtrace::_print_fmt::h371adc3f02dab1dd
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/std/src/sys/backtrace.rs:66:9
   3:     0x7e34f1ca3b0d - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h148e7d8e87bab30f
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/std/src/sys/backtrace.rs:39:26
   4:     0x7e34f1cf429b - core::fmt::rt::Argument::fmt::h7d54e75d5909de1b
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/core/src/fmt/rt.rs:173:76
   5:     0x7e34f1cf429b - core::fmt::write::hf6482455a45a91c7
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/core/src/fmt/mod.rs:1178:21
   6:     0x7e34f1c979a3 - std::io::Write::write_fmt::h78337f43013967dc
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/std/src/io/mod.rs:1823:15
   7:     0x7e34f1ca6302 - std::sys::backtrace::BacktraceLock::print::he76ad41bfebe12ae
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/std/src/sys/backtrace.rs:42:9
   8:     0x7e34f1ca6302 - std::panicking::default_hook::{{closure}}::hea2fb4697dfb5a9e
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/std/src/panicking.rs:266:22
   9:     0x7e34f1ca5f6e - std::panicking::default_hook::h1dd19741d2e30ca9
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/std/src/panicking.rs:293:9
  10:     0x7e34ee0ba397 - std[3ddd7f8965915055]::panicking::update_hook::<alloc[5625efa5c1f04643]::boxed::Box<rustc_driver_impl[a075302d1f094aad]::install_ice_hook::{closure#0}>>::{closure#0}
  11:     0x7e34f1ca6cf2 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h0b220dc3792e0071
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/alloc/src/boxed.rs:2164:9
  12:     0x7e34f1ca6cf2 - std::panicking::rust_panic_with_hook::h31e66c1e0f0e6e18
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/std/src/panicking.rs:805:13
  13:     0x7e34f1ca6973 - std::panicking::begin_panic_handler::{{closure}}::h1057116e4a630d6a
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/std/src/panicking.rs:664:13
  14:     0x7e34f1ca3ff9 - std::sys::backtrace::__rust_end_short_backtrace::h943392b86d4267f1
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/std/src/sys/backtrace.rs:170:18
  15:     0x7e34f1ca6634 - rust_begin_unwind
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/std/src/panicking.rs:662:5
  16:     0x7e34f1cf08f3 - core::panicking::panic_fmt::h8f072a14c223852d
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/core/src/panicking.rs:74:14
  17:     0x7e34f1cf097c - core::panicking::panic::h21e129948c7bcefa
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/core/src/panicking.rs:148:5
  18:     0x7e34ec62c220 - <rustc_span[d8ab92baa90519c6]::source_map::SourceMap>::lookup_char_pos
  19:     0x7e34f078653f - <rustc_span[d8ab92baa90519c6]::source_map::SourceMap>::is_valid_span
  20:     0x7e34f078b73f - <core[d8d378ef57b379bb]::iter::adapters::filter_map::FilterMap<core[d8d378ef57b379bb]::iter::adapters::cloned::Cloned<core[d8d378ef57b379bb]::iter::adapters::filter::Filter<core[d8d378ef57b379bb]::slice::iter::Iter<rustc_errors[859dc14a00acad37]::Substitution>, <rustc_errors[859dc14a00acad37]::CodeSuggestion>::splice_lines::{closure#0}>>, <rustc_errors[859dc14a00acad37]::CodeSuggestion>::splice_lines::{closure#1}> as core[d8d378ef57b379bb]::iter::traits::iterator::Iterator>::next
  21:     0x7e34f078eef2 - <rustc_errors[859dc14a00acad37]::emitter::HumanEmitter>::emit_messages_default
  22:     0x7e34f0805be7 - <rustc_errors[859dc14a00acad37]::emitter::HumanEmitter as rustc_errors[859dc14a00acad37]::emitter::Emitter>::emit_diagnostic
  23:     0x7e34f08071af - <rustc_errors[859dc14a00acad37]::DiagCtxtInner>::emit_diagnostic::{closure#3}
  24:     0x7e34f0804737 - rustc_interface[ecbe5e558f1e13b6]::callbacks::track_diagnostic::<core[d8d378ef57b379bb]::option::Option<rustc_span[d8ab92baa90519c6]::ErrorGuaranteed>>
  25:     0x7e34f0802bbe - <rustc_errors[859dc14a00acad37]::DiagCtxtInner>::emit_diagnostic
  26:     0x7e34f0802a6d - <rustc_errors[859dc14a00acad37]::DiagCtxtHandle>::emit_diagnostic
  27:     0x7e34f0801c15 - <rustc_span[d8ab92baa90519c6]::ErrorGuaranteed as rustc_errors[859dc14a00acad37]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  28:     0x7e34efa96900 - <rustc_parse[637f6a5d800c635f]::parser::Parser>::parse_local
  29:     0x7e34efa5ae6f - <rustc_parse[637f6a5d800c635f]::parser::Parser>::parse_stmt_without_recovery
  30:     0x7e34efa574c2 - <rustc_parse[637f6a5d800c635f]::parser::Parser>::parse_full_stmt
  31:     0x7e34efa54262 - <rustc_parse[637f6a5d800c635f]::parser::Parser>::parse_block_common
  32:     0x7e34eff5e33b - <rustc_parse[637f6a5d800c635f]::parser::Parser>::parse_fn
  33:     0x7e34eff625a1 - <rustc_parse[637f6a5d800c635f]::parser::Parser>::parse_item_kind
  34:     0x7e34eff5975a - <rustc_parse[637f6a5d800c635f]::parser::Parser>::parse_item_common
  35:     0x7e34eff5694f - <rustc_parse[637f6a5d800c635f]::parser::Parser>::parse_item_
  36:     0x7e34eff560ac - <rustc_parse[637f6a5d800c635f]::parser::Parser>::parse_mod
  37:     0x7e34f0614adf - <rustc_interface[ecbe5e558f1e13b6]::queries::Queries>::parse
  38:     0x7e34f045ce21 - rustc_interface[ecbe5e558f1e13b6]::interface::run_compiler::<core[d8d378ef57b379bb]::result::Result<(), rustc_span[d8ab92baa90519c6]::ErrorGuaranteed>, rustc_driver_impl[a075302d1f094aad]::run_compiler::{closure#0}>::{closure#1}
  39:     0x7e34f036a489 - std[3ddd7f8965915055]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[ecbe5e558f1e13b6]::util::run_in_thread_with_globals<rustc_interface[ecbe5e558f1e13b6]::util::run_in_thread_pool_with_globals<rustc_interface[ecbe5e558f1e13b6]::interface::run_compiler<core[d8d378ef57b379bb]::result::Result<(), rustc_span[d8ab92baa90519c6]::ErrorGuaranteed>, rustc_driver_impl[a075302d1f094aad]::run_compiler::{closure#0}>::{closure#1}, core[d8d378ef57b379bb]::result::Result<(), rustc_span[d8ab92baa90519c6]::ErrorGuaranteed>>::{closure#0}, core[d8d378ef57b379bb]::result::Result<(), rustc_span[d8ab92baa90519c6]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d8d378ef57b379bb]::result::Result<(), rustc_span[d8ab92baa90519c6]::ErrorGuaranteed>>
  40:     0x7e34f036a232 - <<std[3ddd7f8965915055]::thread::Builder>::spawn_unchecked_<rustc_interface[ecbe5e558f1e13b6]::util::run_in_thread_with_globals<rustc_interface[ecbe5e558f1e13b6]::util::run_in_thread_pool_with_globals<rustc_interface[ecbe5e558f1e13b6]::interface::run_compiler<core[d8d378ef57b379bb]::result::Result<(), rustc_span[d8ab92baa90519c6]::ErrorGuaranteed>, rustc_driver_impl[a075302d1f094aad]::run_compiler::{closure#0}>::{closure#1}, core[d8d378ef57b379bb]::result::Result<(), rustc_span[d8ab92baa90519c6]::ErrorGuaranteed>>::{closure#0}, core[d8d378ef57b379bb]::result::Result<(), rustc_span[d8ab92baa90519c6]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d8d378ef57b379bb]::result::Result<(), rustc_span[d8ab92baa90519c6]::ErrorGuaranteed>>::{closure#1} as core[d8d378ef57b379bb]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  41:     0x7e34f1cb0a0b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8531124d63bf03d4
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/alloc/src/boxed.rs:2150:9
  42:     0x7e34f1cb0a0b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h14280c2e7cc937ab
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/alloc/src/boxed.rs:2150:9
  43:     0x7e34f1cb0a0b - std::sys::pal::unix::thread::Thread::new::thread_start::hfbbba69bca48c3db
                               at /rustc/2048386fe2898febe7315c0feb915458e41c7aa5/library/std/src/sys/pal/unix/thread.rs:110:17
  44:     0x7e34f1a3cded - <unknown>
  45:     0x7e34f1ac00dc - <unknown>
  46:                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 (2048386fe 2024-08-08) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack
error: aborting due to 2 previous errors

[workingjubilee]

@matthiaskrgr Can you start pingbacking #128790 at least for all of these?

[matthiaskrgr]

ice since #127407

[matthiaskrgr]

@workingjubilee can you add a filter for is:issue is:open label:I-ICE "bpos.to_u32" into the ticket you mentioned? That should find all relevant past an future issues automatically I think.

[workingjubilee]

@matthiaskrgr A filter? How do I do that?

[workingjubilee]

oh, you mean a link

[jieyouxu]

@workingjubilee can you add a filter for is:issue is:open label:I-ICE "bpos.to_u32" into the ticket you mentioned? That should find all relevant past an future issues automatically I think.

I added a label D-diagnostic-unaware, I'll go back and tag some of them later.