ICE: entered unreachable code: parse_dot_or_call_expr_with_ shouldn't produce this

[matthiaskrgr]

snippet:

fn main() {
    bar::c::cc as cal.match {};
}

EDIT: smaller:

fn main() {
    a as b.match {};
}

Version information

rustc 1.79.0-nightly (36b6f9b58 2024-04-02)
binary: rustc
commit-hash: 36b6f9b58e78a1225a322a759e42c262e6dc8d5d
commit-date: 2024-04-02
host: x86_64-unknown-linux-gnu
release: 1.79.0-nightly
LLVM version: 18.1.2

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

Program output

thread 'rustc' panicked at compiler/rustc_parse/src/parser/expr.rs:864:26:
internal error: entered unreachable code: parse_dot_or_call_expr_with_ shouldn't produce this
stack backtrace:
   0:     0x7877392ebab5 - std::backtrace_rs::backtrace::libunwind::trace::hb554c6cfce162cb7
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x7877392ebab5 - std::backtrace_rs::backtrace::trace_unsynchronized::h9dc33cf446c01521
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7877392ebab5 - std::sys_common::backtrace::_print_fmt::hfaf9c226bbee02d6
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7877392ebab5 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h709ff639877dfcc9
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x78773933acfb - core::fmt::rt::Argument::fmt::ha2e1d329cf33e392
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/core/src/fmt/rt.rs:142:9
   5:     0x78773933acfb - core::fmt::write::hc6e32ec589b5b732
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/core/src/fmt/mod.rs:1153:17
   6:     0x7877392e071f - std::io::Write::write_fmt::h76af0a9a50d5920b
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/std/src/io/mod.rs:1843:15
   7:     0x7877392eb88e - std::sys_common::backtrace::_print::h050eb9698c773e14
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7877392eb88e - std::sys_common::backtrace::print::hf972d8655188dec4
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7877392ee2d9 - std::panicking::default_hook::{{closure}}::h11f7742d4e1e394f
  10:     0x7877392ee043 - std::panicking::default_hook::h47c437f579fa3ba0
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/std/src/panicking.rs:291:9
  11:     0x787735bfa23e - std[dde4c46f3e4e4933]::panicking::update_hook::<alloc[40f8f08cb9ca21e1]::boxed::Box<rustc_driver_impl[ab9373d42ce754a3]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7877392ee9dc - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h97cf3abc6eaf7b2c
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/alloc/src/boxed.rs:2032:9
  13:     0x7877392ee9dc - std::panicking::rust_panic_with_hook::h0852f31e48eac668
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/std/src/panicking.rs:792:13
  14:     0x7877392ee74d - std::panicking::begin_panic_handler::{{closure}}::h3de72ba740b32f92
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/std/src/panicking.rs:649:13
  15:     0x7877392ebf79 - std::sys_common::backtrace::__rust_end_short_backtrace::h7fb3651ed3021033
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7877392ee4b7 - rust_begin_unwind
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/std/src/panicking.rs:645:5
  17:     0x787739337196 - core::panicking::panic_fmt::h661b0cb8cba97650
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/core/src/panicking.rs:72:14
  18:     0x787737484b4e - <rustc_parse[61130940a4f934c7]::parser::Parser>::parse_and_disallow_postfix_after_cast
  19:     0x787737483f76 - <rustc_parse[61130940a4f934c7]::parser::Parser>::parse_assoc_op_cast
  20:     0x787733d7e686 - <rustc_parse[61130940a4f934c7]::parser::Parser>::parse_expr_assoc_with
  21:     0x787737253ecd - <rustc_parse[61130940a4f934c7]::parser::Parser>::parse_stmt_without_recovery
  22:     0x787737251f5d - <rustc_parse[61130940a4f934c7]::parser::Parser>::parse_full_stmt
  23:     0x7877372514e8 - <rustc_parse[61130940a4f934c7]::parser::Parser>::parse_block_tail
  24:     0x78773725d2e9 - <rustc_parse[61130940a4f934c7]::parser::Parser>::parse_fn
  25:     0x787737222b15 - <rustc_parse[61130940a4f934c7]::parser::Parser>::parse_item_kind
  26:     0x787737245883 - <rustc_parse[61130940a4f934c7]::parser::Parser>::parse_item_common
  27:     0x7877372427e5 - <rustc_parse[61130940a4f934c7]::parser::Parser>::parse_mod
  28:     0x787737e437ce - rustc_interface[f4f6ad3d2f6f7b2e]::passes::parse
  29:     0x787737e435d3 - <rustc_interface[f4f6ad3d2f6f7b2e]::queries::Queries>::parse
  30:     0x787737c220ec - rustc_interface[f4f6ad3d2f6f7b2e]::interface::run_compiler::<core[27be123739a20c93]::result::Result<(), rustc_span[4b546e586c05f092]::ErrorGuaranteed>, rustc_driver_impl[ab9373d42ce754a3]::run_compiler::{closure#0}>::{closure#0}
  31:     0x787737cf4253 - std[dde4c46f3e4e4933]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[f4f6ad3d2f6f7b2e]::util::run_in_thread_with_globals<rustc_interface[f4f6ad3d2f6f7b2e]::util::run_in_thread_pool_with_globals<rustc_interface[f4f6ad3d2f6f7b2e]::interface::run_compiler<core[27be123739a20c93]::result::Result<(), rustc_span[4b546e586c05f092]::ErrorGuaranteed>, rustc_driver_impl[ab9373d42ce754a3]::run_compiler::{closure#0}>::{closure#0}, core[27be123739a20c93]::result::Result<(), rustc_span[4b546e586c05f092]::ErrorGuaranteed>>::{closure#0}, core[27be123739a20c93]::result::Result<(), rustc_span[4b546e586c05f092]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[27be123739a20c93]::result::Result<(), rustc_span[4b546e586c05f092]::ErrorGuaranteed>>
  32:     0x787737cf4061 - <<std[dde4c46f3e4e4933]::thread::Builder>::spawn_unchecked_<rustc_interface[f4f6ad3d2f6f7b2e]::util::run_in_thread_with_globals<rustc_interface[f4f6ad3d2f6f7b2e]::util::run_in_thread_pool_with_globals<rustc_interface[f4f6ad3d2f6f7b2e]::interface::run_compiler<core[27be123739a20c93]::result::Result<(), rustc_span[4b546e586c05f092]::ErrorGuaranteed>, rustc_driver_impl[ab9373d42ce754a3]::run_compiler::{closure#0}>::{closure#0}, core[27be123739a20c93]::result::Result<(), rustc_span[4b546e586c05f092]::ErrorGuaranteed>>::{closure#0}, core[27be123739a20c93]::result::Result<(), rustc_span[4b546e586c05f092]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[27be123739a20c93]::result::Result<(), rustc_span[4b546e586c05f092]::ErrorGuaranteed>>::{closure#1} as core[27be123739a20c93]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  33:     0x7877392f83fb - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h930e146764354393
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/alloc/src/boxed.rs:2018:9
  34:     0x7877392f83fb - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h9f08d22b87052fc1
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/alloc/src/boxed.rs:2018:9
  35:     0x7877392f83fb - std::sys::pal::unix::thread::Thread::new::thread_start::hd7bb799ae250c035
                               at /rustc/36b6f9b58e78a1225a322a759e42c262e6dc8d5d/library/std/src/sys/pal/unix/thread.rs:108:17
  36:     0x787732aa955a - <unknown>
  37:     0x787732b26a3c - <unknown>
  38:                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: rustc 1.79.0-nightly (36b6f9b58 2024-04-02) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack

[matthiaskrgr]

#121619 cc @RossSmyth