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ICE when a function inside an extern block has a body, and that body has a trait impl #91370

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Badel2 opened this issue Nov 29, 2021 · 1 comment · Fixed by #92510
Closed

ICE when a function inside an extern block has a body, and that body has a trait impl #91370

Badel2 opened this issue Nov 29, 2021 · 1 comment · Fixed by #92510
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@inquisitivecrystal
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C-bug Category: This is a bug. glacier ICE tracked in rust-lang/glacier. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@Badel2
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Badel2 commented Nov 29, 2021 •
edited by rustbot
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I'm seeing an internal compiler error on the following input, found by fuzz-rustc:

Code

extern {
    fn r() {
        impl Copy for u8 {}
    }
}

Error output

error: incorrect function inside `extern` block
 --> src/lib.rs:2:8
  |
1 |   extern {
  |   ------ `extern` blocks define existing foreign functions and functions inside of them cannot have a body
2 |       fn r() {
  |  ________^___-
  | |        |
  | |        cannot have a body
3 | |         impl Copy for u8 {}
4 | |     }
  | |_____- help: remove the invalid body: `;`
  |
  = help: you might have meant to write a function accessible through FFI, which can be done by writing `extern fn` outside of the `extern` block
  = note: for more information, visit https://doc.rust-lang.org/std/keyword.extern.html

thread 'rustc' panicked at 'index out of bounds: the len is 5 but the index is 5', /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/compiler/rustc_middle/src/hir/map/mod.rs:210:52
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Affected versions: I tried nightly 2021-11-28 and stable 1.56.1 and they both ICE. In stable 1.56.1 the error message is different though, I would say it's better:

error: internal compiler error: compiler/rustc_middle/src/hir/map/mod.rs:326:41: couldn't find hir id HirId { owner: DefId(0:5 ~ playground[443b]::::r::{impl#0}), local_id: 0 } in the HIR map
Backtrace 

   Compiling playground v0.0.1 (/playground)
error: incorrect function inside `extern` block
 --> src/lib.rs:2:8
  |
1 |   extern {
  |   ------ `extern` blocks define existing foreign functions and functions inside of them cannot have a body
2 |       fn r() {
  |  ________^___-
  | |        |
  | |        cannot have a body
3 | |         impl Copy for u8 {}
4 | |     }
  | |_____- help: remove the invalid body: `;`
  |
  = help: you might have meant to write a function accessible through FFI, which can be done by writing `extern fn` outside of the `extern` block
  = note: for more information, visit https://doc.rust-lang.org/std/keyword.extern.html

thread 'rustc' panicked at 'index out of bounds: the len is 5 but the index is 5', /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/compiler/rustc_middle/src/hir/map/mod.rs:210:52
stack backtrace:
   0: rust_begin_unwind
             at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/panicking.rs:498:5
   1: core::panicking::panic_fmt
             at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/core/src/panicking.rs:107:14
   2: core::panicking::panic_bounds_check
             at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/core/src/panicking.rs:75:5
   3: rustc_typeck::collect::impl_trait_ref
   4: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::impl_trait_ref
   5: rustc_typeck::coherence::orphan::orphan_check_crate
   6: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<(), &[rustc_span::def_id::LocalDefId]>>
   7: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::orphan_check_crate, rustc_query_impl::plumbing::QueryCtxt>
   8: <rustc_session::session::Session>::track_errors::<rustc_typeck::check_crate::{closure#3}, ()>
   9: rustc_typeck::check_crate
  10: rustc_interface::passes::analysis
  11: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<(), core::result::Result<(), rustc_errors::ErrorReported>>>
  12: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
  13: <rustc_interface::passes::QueryContext>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}::{closure#3}, core::result::Result<(), rustc_errors::ErrorReported>>
  14: <rustc_interface::interface::Compiler>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorReported>>
  15: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorReported>, rustc_interface::interface::create_compiler_and_run<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#1}>
  16: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose 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 1.59.0-nightly (db9d361a4 2021-11-28) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2 --crate-type lib

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
thread 'rustc' panicked at 'index out of bounds: the len is 5 but the index is 5', compiler/rustc_middle/src/hir/map/mod.rs:210:52
stack backtrace:
   0:     0x7f54934e103c - std::backtrace_rs::backtrace::libunwind::trace::hc0d1f8b7d70190d2
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f54934e103c - std::backtrace_rs::backtrace::trace_unsynchronized::h94aea4818b005cdb
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f54934e103c - std::sys_common::backtrace::_print_fmt::hb60a10c1749ee317
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7f54934e103c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h343208346f8e323c
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/sys_common/backtrace.rs:46:22
   4:     0x7f549353dd9c - core::fmt::write::h72801a82c94e6ff1
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/core/src/fmt/mod.rs:1149:17
   5:     0x7f54934d1695 - std::io::Write::write_fmt::h112481bad48af12b
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/io/mod.rs:1697:15
   6:     0x7f54934e4200 - std::sys_common::backtrace::_print::hb97822725c04584f
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/sys_common/backtrace.rs:49:5
   7:     0x7f54934e4200 - std::sys_common::backtrace::print::h9e4e4e41087102c8
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/sys_common/backtrace.rs:36:9
   8:     0x7f54934e4200 - std::panicking::default_hook::{{closure}}::h98acb2f5574cdd66
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/panicking.rs:211:50
   9:     0x7f54934e3dab - std::panicking::default_hook::hf70e89ed6d75872b
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/panicking.rs:228:9
  10:     0x7f5493c830d1 - rustc_driver[a54076ffa5a213bc]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f54934e4a19 - std::panicking::rust_panic_with_hook::hf940f4eb73f69fac
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/panicking.rs:610:17
  12:     0x7f54934e44d0 - std::panicking::begin_panic_handler::{{closure}}::h82243bf8eac030fd
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/panicking.rs:502:13
  13:     0x7f54934e14e4 - std::sys_common::backtrace::__rust_end_short_backtrace::h069f9c03677e0254
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/sys_common/backtrace.rs:139:18
  14:     0x7f54934e4439 - rust_begin_unwind
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/panicking.rs:498:5
  15:     0x7f54934a9491 - core::panicking::panic_fmt::h7b8580d81fcbbacd
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/core/src/panicking.rs:107:14
  16:     0x7f54934a9452 - core::panicking::panic_bounds_check::h63650a5dfc9aa86f
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/core/src/panicking.rs:75:5
  17:     0x7f5495a41bb2 - <rustc_middle[285bc2392d469bf7]::hir::provide::{closure#7} as core[cc79c391059f8e46]::ops::function::FnOnce<(rustc_middle[285bc2392d469bf7]::ty::context::TyCtxt, rustc_span[2d5555579096f1fe]::def_id::DefId)>>::call_once
  18:     0x7f54955db48b - <rustc_query_impl[40c3d6d60a0dbb85]::Queries as rustc_middle[285bc2392d469bf7]::ty::query::QueryEngine>::def_span
  19:     0x7f54963ae43e - <rustc_middle[285bc2392d469bf7]::ty::print::pretty::FmtPrinter<&mut alloc[7de0d13971327f45]::string::String> as rustc_middle[285bc2392d469bf7]::ty::print::Printer>::print_def_path
  20:     0x7f549639eb12 - <rustc_middle[285bc2392d469bf7]::ty::context::TyCtxt>::def_path_str_with_substs
  21:     0x7f549639e9f4 - <rustc_middle[285bc2392d469bf7]::ty::context::TyCtxt>::def_path_str
  22:     0x7f54945af151 - <std[79b10227d68e643c]::thread::local::LocalKey<core[cc79c391059f8e46]::cell::Cell<bool>>>::with::<rustc_middle[285bc2392d469bf7]::ty::print::pretty::with_no_trimmed_paths<<rustc_query_impl[40c3d6d60a0dbb85]::queries::impl_trait_ref as rustc_query_system[2bde6a78003d88e]::query::config::QueryDescription<rustc_query_impl[40c3d6d60a0dbb85]::plumbing::QueryCtxt>>::describe::{closure#0}, alloc[7de0d13971327f45]::string::String>::{closure#0}, alloc[7de0d13971327f45]::string::String>
  23:     0x7f54945e1228 - <rustc_query_impl[40c3d6d60a0dbb85]::queries::impl_trait_ref as rustc_query_system[2bde6a78003d88e]::query::config::QueryDescription<rustc_query_impl[40c3d6d60a0dbb85]::plumbing::QueryCtxt>>::describe
  24:     0x7f54945c8457 - <std[79b10227d68e643c]::thread::local::LocalKey<core[cc79c391059f8e46]::cell::Cell<bool>>>::with::<rustc_middle[285bc2392d469bf7]::ty::print::pretty::with_forced_impl_filename_line<rustc_query_impl[40c3d6d60a0dbb85]::make_query::impl_trait_ref::{closure#0}::{closure#0}, alloc[7de0d13971327f45]::string::String>::{closure#0}, alloc[7de0d13971327f45]::string::String>
  25:     0x7f54945bd299 - <std[79b10227d68e643c]::thread::local::LocalKey<core[cc79c391059f8e46]::cell::Cell<bool>>>::with::<rustc_middle[285bc2392d469bf7]::ty::print::pretty::with_no_visible_paths<rustc_query_impl[40c3d6d60a0dbb85]::make_query::impl_trait_ref::{closure#0}, alloc[7de0d13971327f45]::string::String>::{closure#0}, alloc[7de0d13971327f45]::string::String>
  26:     0x7f549475c3e5 - rustc_query_impl[40c3d6d60a0dbb85]::make_query::impl_trait_ref
  27:     0x7f549450a97b - <rustc_query_system[2bde6a78003d88e]::query::plumbing::QueryState<rustc_middle[285bc2392d469bf7]::dep_graph::dep_node::DepKind, rustc_span[2d5555579096f1fe]::def_id::DefId>>::try_collect_active_jobs::<rustc_query_impl[40c3d6d60a0dbb85]::plumbing::QueryCtxt>
  28:     0x7f54945febcf - <rustc_query_impl[40c3d6d60a0dbb85]::Queries>::try_collect_active_jobs
  29:     0x7f5494721062 - rustc_query_system[2bde6a78003d88e]::query::job::print_query_stack::<rustc_query_impl[40c3d6d60a0dbb85]::plumbing::QueryCtxt>
  30:     0x7f5493da058f - rustc_interface[3206e7bd345239de]::interface::try_print_query_stack
  31:     0x7f5493c834f7 - rustc_driver[a54076ffa5a213bc]::report_ice
  32:     0x7f54934e4a19 - std::panicking::rust_panic_with_hook::hf940f4eb73f69fac
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/panicking.rs:610:17
  33:     0x7f54934e44d0 - std::panicking::begin_panic_handler::{{closure}}::h82243bf8eac030fd
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/panicking.rs:502:13
  34:     0x7f54934e14e4 - std::sys_common::backtrace::__rust_end_short_backtrace::h069f9c03677e0254
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/sys_common/backtrace.rs:139:18
  35:     0x7f54934e4439 - rust_begin_unwind
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/panicking.rs:498:5
  36:     0x7f54934a9491 - core::panicking::panic_fmt::h7b8580d81fcbbacd
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/core/src/panicking.rs:107:14
  37:     0x7f54934a9452 - core::panicking::panic_bounds_check::h63650a5dfc9aa86f
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/core/src/panicking.rs:75:5
  38:     0x7f5495d9fead - rustc_typeck[9e38b16bd9631970]::collect::impl_trait_ref
  39:     0x7f54955d8092 - <rustc_query_impl[40c3d6d60a0dbb85]::Queries as rustc_middle[285bc2392d469bf7]::ty::query::QueryEngine>::impl_trait_ref
  40:     0x7f5495de3abd - rustc_typeck[9e38b16bd9631970]::coherence::orphan::orphan_check_crate
  41:     0x7f5495fd7f89 - rustc_query_system[2bde6a78003d88e]::query::plumbing::try_execute_query::<rustc_query_impl[40c3d6d60a0dbb85]::plumbing::QueryCtxt, rustc_query_system[2bde6a78003d88e]::query::caches::DefaultCache<(), &[rustc_span[2d5555579096f1fe]::def_id::LocalDefId]>>
  42:     0x7f5496018031 - rustc_query_system[2bde6a78003d88e]::query::plumbing::get_query::<rustc_query_impl[40c3d6d60a0dbb85]::queries::orphan_check_crate, rustc_query_impl[40c3d6d60a0dbb85]::plumbing::QueryCtxt>
  43:     0x7f5495dad5b4 - <rustc_session[b2ee9260b1d6486]::session::Session>::track_errors::<rustc_typeck[9e38b16bd9631970]::check_crate::{closure#3}, ()>
  44:     0x7f5495da96fa - rustc_typeck[9e38b16bd9631970]::check_crate
  45:     0x7f5495b3d567 - rustc_interface[3206e7bd345239de]::passes::analysis
  46:     0x7f5495fd2c95 - rustc_query_system[2bde6a78003d88e]::query::plumbing::try_execute_query::<rustc_query_impl[40c3d6d60a0dbb85]::plumbing::QueryCtxt, rustc_query_system[2bde6a78003d88e]::query::caches::DefaultCache<(), core[cc79c391059f8e46]::result::Result<(), rustc_errors[d745ba542b3af442]::ErrorReported>>>
  47:     0x7f5496026fa5 - rustc_query_system[2bde6a78003d88e]::query::plumbing::get_query::<rustc_query_impl[40c3d6d60a0dbb85]::queries::analysis, rustc_query_impl[40c3d6d60a0dbb85]::plumbing::QueryCtxt>
  48:     0x7f5495b32d79 - <rustc_interface[3206e7bd345239de]::passes::QueryContext>::enter::<rustc_driver[a54076ffa5a213bc]::run_compiler::{closure#1}::{closure#2}::{closure#3}, core[cc79c391059f8e46]::result::Result<(), rustc_errors[d745ba542b3af442]::ErrorReported>>
  49:     0x7f5495b147c4 - <rustc_interface[3206e7bd345239de]::interface::Compiler>::enter::<rustc_driver[a54076ffa5a213bc]::run_compiler::{closure#1}::{closure#2}, core[cc79c391059f8e46]::result::Result<core[cc79c391059f8e46]::option::Option<rustc_interface[3206e7bd345239de]::queries::Linker>, rustc_errors[d745ba542b3af442]::ErrorReported>>
  50:     0x7f5495b10fcd - rustc_span[2d5555579096f1fe]::with_source_map::<core[cc79c391059f8e46]::result::Result<(), rustc_errors[d745ba542b3af442]::ErrorReported>, rustc_interface[3206e7bd345239de]::interface::create_compiler_and_run<core[cc79c391059f8e46]::result::Result<(), rustc_errors[d745ba542b3af442]::ErrorReported>, rustc_driver[a54076ffa5a213bc]::run_compiler::{closure#1}>::{closure#1}>
  51:     0x7f5495b1574f - <scoped_tls[3fea4c3dcac147b1]::ScopedKey<rustc_span[2d5555579096f1fe]::SessionGlobals>>::set::<rustc_interface[3206e7bd345239de]::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface[3206e7bd345239de]::interface::run_compiler<core[cc79c391059f8e46]::result::Result<(), rustc_errors[d745ba542b3af442]::ErrorReported>, rustc_driver[a54076ffa5a213bc]::run_compiler::{closure#1}>::{closure#0}, core[cc79c391059f8e46]::result::Result<(), rustc_errors[d745ba542b3af442]::ErrorReported>>::{closure#0}::{closure#0}, core[cc79c391059f8e46]::result::Result<(), rustc_errors[d745ba542b3af442]::ErrorReported>>
  52:     0x7f5495b13845 - std[79b10227d68e643c]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[3206e7bd345239de]::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface[3206e7bd345239de]::interface::run_compiler<core[cc79c391059f8e46]::result::Result<(), rustc_errors[d745ba542b3af442]::ErrorReported>, rustc_driver[a54076ffa5a213bc]::run_compiler::{closure#1}>::{closure#0}, core[cc79c391059f8e46]::result::Result<(), rustc_errors[d745ba542b3af442]::ErrorReported>>::{closure#0}, core[cc79c391059f8e46]::result::Result<(), rustc_errors[d745ba542b3af442]::ErrorReported>>
  53:     0x7f5495b337da - <<std[79b10227d68e643c]::thread::Builder>::spawn_unchecked<rustc_interface[3206e7bd345239de]::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface[3206e7bd345239de]::interface::run_compiler<core[cc79c391059f8e46]::result::Result<(), rustc_errors[d745ba542b3af442]::ErrorReported>, rustc_driver[a54076ffa5a213bc]::run_compiler::{closure#1}>::{closure#0}, core[cc79c391059f8e46]::result::Result<(), rustc_errors[d745ba542b3af442]::ErrorReported>>::{closure#0}, core[cc79c391059f8e46]::result::Result<(), rustc_errors[d745ba542b3af442]::ErrorReported>>::{closure#1} as core[cc79c391059f8e46]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  54:     0x7f54934efb23 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h732269b0f7c15df2
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/alloc/src/boxed.rs:1694:9
  55:     0x7f54934efb23 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h81bbb21674b25c87
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/alloc/src/boxed.rs:1694:9
  56:     0x7f54934efb23 - std::sys::unix::thread::Thread::new::thread_start::he34f2ab1cc243b66
                               at /rustc/db9d361a4731ca0bb48533fab6297a8fea75696f/library/std/src/sys/unix/thread.rs:108:17
  57:     0x7f5493428609 - start_thread
  58:     0x7f549333c293 - clone
  59:                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 1.59.0-nightly (db9d361a4 2021-11-28) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2 --crate-type lib

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
thread panicked while panicking. aborting.
error: could not compile `playground` due to previous error

@Badel2 Badel2 added C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Nov 29, 2021
@terrarier2111 terrarier2111 removed their assignment Dec 10, 2021
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Badel2 commented Dec 12, 2021

In one of the recent nightlies the error message has changed to

error: internal compiler error: compiler/rustc_middle/src/hir/map/mod.rs:875:18: expected item, found unknown node (hir_id=HirId { owner: DefId(0:5 ~ playground[965a]::::r::{impl#0}), local_id: 0 })
Backtrace 

   Compiling playground v0.0.1 (/playground)
error: incorrect function inside `extern` block
 --> src/main.rs:2:8
  |
1 |   extern {
  |   ------ `extern` blocks define existing foreign functions and functions inside of them cannot have a body
2 |       fn r() {
  |  ________^___-
  | |        |
  | |        cannot have a body
3 | |         impl Copy for u8 {}
4 | |     }
  | |_____- help: remove the invalid body: `;`
  |
  = help: you might have meant to write a function accessible through FFI, which can be done by writing `extern fn` outside of the `extern` block
  = note: for more information, visit https://doc.rust-lang.org/std/keyword.extern.html

error[E0601]: `main` function not found in crate `playground`
 --> src/main.rs:1:1
  |
1 | / extern {
2 | |     fn r() {
3 | |         impl Copy for u8 {}
4 | |     }
5 | | }
  | |_^ consider adding a `main` function to `src/main.rs`

error: internal compiler error: compiler/rustc_middle/src/hir/map/mod.rs:875:18: expected item, found unknown node (hir_id=HirId { owner: DefId(0:5 ~ playground[965a]::::r::{impl#0}), local_id: 0 })

thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1170:9
stack backtrace:
   0: std::panicking::begin_panic::<rustc_errors::ExplicitBug>
   1: std::panic::panic_any::<rustc_errors::ExplicitBug>
   2: <rustc_errors::HandlerInner>::bug
   3: <rustc_errors::Handler>::bug
   4: rustc_middle::ty::context::tls::with_opt::<rustc_middle::util::bug::opt_span_bug_fmt<rustc_span::span_encoding::Span>::{closure#0}, ()>
   5: rustc_middle::util::bug::opt_span_bug_fmt::<rustc_span::span_encoding::Span>
   6: rustc_middle::util::bug::bug_fmt
   7: <rustc_middle::hir::map::Map>::expect_item
   8: rustc_typeck::collect::impl_trait_ref
   9: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::impl_trait_ref
  10: rustc_typeck::coherence::orphan::orphan_check_crate
  11: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<(), &[rustc_span::def_id::LocalDefId]>>
  12: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::orphan_check_crate, rustc_query_impl::plumbing::QueryCtxt>
  13: <rustc_session::session::Session>::track_errors::<rustc_typeck::check_crate::{closure#3}, ()>
  14: rustc_typeck::check_crate
  15: rustc_interface::passes::analysis
  16: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<(), core::result::Result<(), rustc_errors::ErrorReported>>>
  17: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
  18: <rustc_interface::passes::QueryContext>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}::{closure#3}, core::result::Result<(), rustc_errors::ErrorReported>>
  19: <rustc_interface::interface::Compiler>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorReported>>
  20: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorReported>, rustc_interface::interface::create_compiler_and_run<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#1}>
  21: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

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 1.59.0-nightly (0b42deacc 2021-12-09) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2 --crate-type bin

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
thread 'rustc' panicked at 'index out of bounds: the len is 5 but the index is 5', compiler/rustc_middle/src/hir/map/mod.rs:210:52
stack backtrace:
   0:     0x7fb7e8cd435c - std::backtrace_rs::backtrace::libunwind::trace::hf7449935ead7573e
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7fb7e8cd435c - std::backtrace_rs::backtrace::trace_unsynchronized::h221aa2d88d72372a
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fb7e8cd435c - std::sys_common::backtrace::_print_fmt::h1c77e8983e1df895
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7fb7e8cd435c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hd4ec41a9a6b0d22c
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/std/src/sys_common/backtrace.rs:46:22
   4:     0x7fb7e8d3137c - core::fmt::write::h72801a82c94e6ff1
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/core/src/fmt/mod.rs:1149:17
   5:     0x7fb7e8cc4a65 - std::io::Write::write_fmt::haf74340a8cbeaa88
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/std/src/io/mod.rs:1660:15
   6:     0x7fb7e8cd7520 - std::sys_common::backtrace::_print::h2d15cd157796a64a
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/std/src/sys_common/backtrace.rs:49:5
   7:     0x7fb7e8cd7520 - std::sys_common::backtrace::print::h52d286d22e2398eb
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/std/src/sys_common/backtrace.rs:36:9
   8:     0x7fb7e8cd7520 - std::panicking::default_hook::{{closure}}::h6da08fba6306daf2
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/std/src/panicking.rs:211:50
   9:     0x7fb7e8cd70cb - std::panicking::default_hook::h266f67a22e76b11a
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/std/src/panicking.rs:228:9
  10:     0x7fb7e97fb291 - rustc_driver[feb513e6adc957d8]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7fb7e8cd7d39 - std::panicking::rust_panic_with_hook::he55698a957f4fb6d
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/std/src/panicking.rs:610:17
  12:     0x7fb7e8cd77f0 - std::panicking::begin_panic_handler::{{closure}}::h01f453c3ac181895
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/std/src/panicking.rs:502:13
  13:     0x7fb7e8cd4804 - std::sys_common::backtrace::__rust_end_short_backtrace::h675d77c6e5a3926d
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/std/src/sys_common/backtrace.rs:139:18
  14:     0x7fb7e8cd7759 - rust_begin_unwind
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/std/src/panicking.rs:498:5
  15:     0x7fb7e8c9bc21 - core::panicking::panic_fmt::h7b8580d81fcbbacd
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/core/src/panicking.rs:107:14
  16:     0x7fb7e8c9bbe2 - core::panicking::panic_bounds_check::h63650a5dfc9aa86f
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/core/src/panicking.rs:75:5
  17:     0x7fb7eb5bc802 - <rustc_middle[f720485c3bb04922]::hir::provide::{closure#7} as core[cc79c391059f8e46]::ops::function::FnOnce<(rustc_middle[f720485c3bb04922]::ty::context::TyCtxt, rustc_span[dda57b1885b40b9a]::def_id::DefId)>>::call_once
  18:     0x7fb7eb16065b - <rustc_query_impl[9c2ccd6b3a0df356]::Queries as rustc_middle[f720485c3bb04922]::ty::query::QueryEngine>::def_span
  19:     0x7fb7ebf367be - <rustc_middle[f720485c3bb04922]::ty::print::pretty::FmtPrinter<&mut alloc[1954047e53701c4d]::string::String> as rustc_middle[f720485c3bb04922]::ty::print::Printer>::print_def_path
  20:     0x7fb7ebf27375 - <rustc_middle[f720485c3bb04922]::ty::context::TyCtxt>::def_path_str
  21:     0x7fb7ea13d531 - <std[f24903a91e569aa2]::thread::local::LocalKey<core[cc79c391059f8e46]::cell::Cell<bool>>>::with::<rustc_middle[f720485c3bb04922]::ty::print::pretty::with_no_trimmed_paths<<rustc_query_impl[9c2ccd6b3a0df356]::queries::impl_trait_ref as rustc_query_system[27ba240b72fd7978]::query::config::QueryDescription<rustc_query_impl[9c2ccd6b3a0df356]::plumbing::QueryCtxt>>::describe::{closure#0}, alloc[1954047e53701c4d]::string::String>::{closure#0}, alloc[1954047e53701c4d]::string::String>
  22:     0x7fb7ea16f728 - <rustc_query_impl[9c2ccd6b3a0df356]::queries::impl_trait_ref as rustc_query_system[27ba240b72fd7978]::query::config::QueryDescription<rustc_query_impl[9c2ccd6b3a0df356]::plumbing::QueryCtxt>>::describe
  23:     0x7fb7ea1568c7 - <std[f24903a91e569aa2]::thread::local::LocalKey<core[cc79c391059f8e46]::cell::Cell<bool>>>::with::<rustc_middle[f720485c3bb04922]::ty::print::pretty::with_forced_impl_filename_line<rustc_query_impl[9c2ccd6b3a0df356]::make_query::impl_trait_ref::{closure#0}::{closure#0}, alloc[1954047e53701c4d]::string::String>::{closure#0}, alloc[1954047e53701c4d]::string::String>
  24:     0x7fb7ea14b719 - <std[f24903a91e569aa2]::thread::local::LocalKey<core[cc79c391059f8e46]::cell::Cell<bool>>>::with::<rustc_middle[f720485c3bb04922]::ty::print::pretty::with_no_visible_paths<rustc_query_impl[9c2ccd6b3a0df356]::make_query::impl_trait_ref::{closure#0}, alloc[1954047e53701c4d]::string::String>::{closure#0}, alloc[1954047e53701c4d]::string::String>
  25:     0x7fb7ea2ec6d5 - rustc_query_impl[9c2ccd6b3a0df356]::make_query::impl_trait_ref
  26:     0x7fb7ea0979cb - <rustc_query_system[27ba240b72fd7978]::query::plumbing::QueryState<rustc_middle[f720485c3bb04922]::dep_graph::dep_node::DepKind, rustc_span[dda57b1885b40b9a]::def_id::DefId>>::try_collect_active_jobs::<rustc_query_impl[9c2ccd6b3a0df356]::plumbing::QueryCtxt>
  27:     0x7fb7ea18db7f - <rustc_query_impl[9c2ccd6b3a0df356]::Queries>::try_collect_active_jobs
  28:     0x7fb7ea16d532 - <rustc_query_impl[9c2ccd6b3a0df356]::plumbing::QueryCtxt>::try_print_query_stack
  29:     0x7fb7e991978f - rustc_interface[4c4b5644b43577f1]::interface::try_print_query_stack
  30:     0x7fb7e97fb6b4 - rustc_driver[feb513e6adc957d8]::report_ice
  31:     0x7fb7e8cd7d39 - std::panicking::rust_panic_with_hook::he55698a957f4fb6d
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/std/src/panicking.rs:610:17
  32:     0x7fb7ea929e6b - std[f24903a91e569aa2]::panicking::begin_panic::<rustc_errors[248f3f311c690252]::ExplicitBug>::{closure#0}
  33:     0x7fb7ea929e06 - std[f24903a91e569aa2]::sys_common::backtrace::__rust_end_short_backtrace::<std[f24903a91e569aa2]::panicking::begin_panic<rustc_errors[248f3f311c690252]::ExplicitBug>::{closure#0}, !>
  34:     0x7fb7ea92cf5f - std[f24903a91e569aa2]::panicking::begin_panic::<rustc_errors[248f3f311c690252]::ExplicitBug>
  35:     0x7fb7ea937ead - std[f24903a91e569aa2]::panic::panic_any::<rustc_errors[248f3f311c690252]::ExplicitBug>
  36:     0x7fb7ea93956d - <rustc_errors[248f3f311c690252]::HandlerInner>::bug
  37:     0x7fb7ea939010 - <rustc_errors[248f3f311c690252]::Handler>::bug
  38:     0x7fb7ea7bd5b6 - rustc_middle[f720485c3bb04922]::ty::context::tls::with_opt::<rustc_middle[f720485c3bb04922]::util::bug::opt_span_bug_fmt<rustc_span[dda57b1885b40b9a]::span_encoding::Span>::{closure#0}, ()>
  39:     0x7fb7ea7bdae0 - rustc_middle[f720485c3bb04922]::util::bug::opt_span_bug_fmt::<rustc_span[dda57b1885b40b9a]::span_encoding::Span>
  40:     0x7fb7ea7bda56 - rustc_middle[f720485c3bb04922]::util::bug::bug_fmt
  41:     0x7fb7eb61f7a7 - <rustc_middle[f720485c3bb04922]::hir::map::Map>::expect_item
  42:     0x7fb7eb92047a - rustc_typeck[3188bff36eb59f03]::collect::impl_trait_ref
  43:     0x7fb7eb15d252 - <rustc_query_impl[9c2ccd6b3a0df356]::Queries as rustc_middle[f720485c3bb04922]::ty::query::QueryEngine>::impl_trait_ref
  44:     0x7fb7eb955da5 - rustc_typeck[3188bff36eb59f03]::coherence::orphan::orphan_check_crate
  45:     0x7fb7ebb61319 - rustc_query_system[27ba240b72fd7978]::query::plumbing::try_execute_query::<rustc_query_impl[9c2ccd6b3a0df356]::plumbing::QueryCtxt, rustc_query_system[27ba240b72fd7978]::query::caches::DefaultCache<(), &[rustc_span[dda57b1885b40b9a]::def_id::LocalDefId]>>
  46:     0x7fb7ebba1ff1 - rustc_query_system[27ba240b72fd7978]::query::plumbing::get_query::<rustc_query_impl[9c2ccd6b3a0df356]::queries::orphan_check_crate, rustc_query_impl[9c2ccd6b3a0df356]::plumbing::QueryCtxt>
  47:     0x7fb7eb922304 - <rustc_session[2680299e10ec9d86]::session::Session>::track_errors::<rustc_typeck[3188bff36eb59f03]::check_crate::{closure#3}, ()>
  48:     0x7fb7eb909a7a - rustc_typeck[3188bff36eb59f03]::check_crate
  49:     0x7fb7eb6b8cf7 - rustc_interface[4c4b5644b43577f1]::passes::analysis
  50:     0x7fb7ebb5c135 - rustc_query_system[27ba240b72fd7978]::query::plumbing::try_execute_query::<rustc_query_impl[9c2ccd6b3a0df356]::plumbing::QueryCtxt, rustc_query_system[27ba240b72fd7978]::query::caches::DefaultCache<(), core[cc79c391059f8e46]::result::Result<(), rustc_errors[248f3f311c690252]::ErrorReported>>>
  51:     0x7fb7ebbb2de5 - rustc_query_system[27ba240b72fd7978]::query::plumbing::get_query::<rustc_query_impl[9c2ccd6b3a0df356]::queries::analysis, rustc_query_impl[9c2ccd6b3a0df356]::plumbing::QueryCtxt>
  52:     0x7fb7eb6ae5b9 - <rustc_interface[4c4b5644b43577f1]::passes::QueryContext>::enter::<rustc_driver[feb513e6adc957d8]::run_compiler::{closure#1}::{closure#2}::{closure#3}, core[cc79c391059f8e46]::result::Result<(), rustc_errors[248f3f311c690252]::ErrorReported>>
  53:     0x7fb7eb68f7ea - <rustc_interface[4c4b5644b43577f1]::interface::Compiler>::enter::<rustc_driver[feb513e6adc957d8]::run_compiler::{closure#1}::{closure#2}, core[cc79c391059f8e46]::result::Result<core[cc79c391059f8e46]::option::Option<rustc_interface[4c4b5644b43577f1]::queries::Linker>, rustc_errors[248f3f311c690252]::ErrorReported>>
  54:     0x7fb7eb68c14d - rustc_span[dda57b1885b40b9a]::with_source_map::<core[cc79c391059f8e46]::result::Result<(), rustc_errors[248f3f311c690252]::ErrorReported>, rustc_interface[4c4b5644b43577f1]::interface::create_compiler_and_run<core[cc79c391059f8e46]::result::Result<(), rustc_errors[248f3f311c690252]::ErrorReported>, rustc_driver[feb513e6adc957d8]::run_compiler::{closure#1}>::{closure#1}>
  55:     0x7fb7eb6907ef - <scoped_tls[3fea4c3dcac147b1]::ScopedKey<rustc_span[dda57b1885b40b9a]::SessionGlobals>>::set::<rustc_interface[4c4b5644b43577f1]::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface[4c4b5644b43577f1]::interface::run_compiler<core[cc79c391059f8e46]::result::Result<(), rustc_errors[248f3f311c690252]::ErrorReported>, rustc_driver[feb513e6adc957d8]::run_compiler::{closure#1}>::{closure#0}, core[cc79c391059f8e46]::result::Result<(), rustc_errors[248f3f311c690252]::ErrorReported>>::{closure#0}::{closure#0}, core[cc79c391059f8e46]::result::Result<(), rustc_errors[248f3f311c690252]::ErrorReported>>
  56:     0x7fb7eb68e995 - std[f24903a91e569aa2]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[4c4b5644b43577f1]::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface[4c4b5644b43577f1]::interface::run_compiler<core[cc79c391059f8e46]::result::Result<(), rustc_errors[248f3f311c690252]::ErrorReported>, rustc_driver[feb513e6adc957d8]::run_compiler::{closure#1}>::{closure#0}, core[cc79c391059f8e46]::result::Result<(), rustc_errors[248f3f311c690252]::ErrorReported>>::{closure#0}, core[cc79c391059f8e46]::result::Result<(), rustc_errors[248f3f311c690252]::ErrorReported>>
  57:     0x7fb7eb6aeffa - <<std[f24903a91e569aa2]::thread::Builder>::spawn_unchecked<rustc_interface[4c4b5644b43577f1]::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface[4c4b5644b43577f1]::interface::run_compiler<core[cc79c391059f8e46]::result::Result<(), rustc_errors[248f3f311c690252]::ErrorReported>, rustc_driver[feb513e6adc957d8]::run_compiler::{closure#1}>::{closure#0}, core[cc79c391059f8e46]::result::Result<(), rustc_errors[248f3f311c690252]::ErrorReported>>::{closure#0}, core[cc79c391059f8e46]::result::Result<(), rustc_errors[248f3f311c690252]::ErrorReported>>::{closure#1} as core[cc79c391059f8e46]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  58:     0x7fb7e8ce2e23 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h4beb69a85f7fb16c
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/alloc/src/boxed.rs:1811:9
  59:     0x7fb7e8ce2e23 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hef865a799f44aaf2
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/alloc/src/boxed.rs:1811:9
  60:     0x7fb7e8ce2e23 - std::sys::unix::thread::Thread::new::thread_start::hee0b2d4e2414fa96
                               at /rustc/0b42deaccc2cbe17a68067aa5fdb76104369e1fd/library/std/src/sys/unix/thread.rs:108:17
  61:     0x7fb7e8c1b609 - start_thread
  62:     0x7fb7e8b2f293 - clone
  63:                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 1.59.0-nightly (0b42deacc 2021-12-09) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2 --crate-type bin

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
thread panicked while panicking. aborting.
error: could not compile `playground` due to 2 previous errors

@rust-lang-glacier-bot rust-lang-glacier-bot added the glacier ICE tracked in rust-lang/glacier. label Dec 13, 2021
@inquisitivecrystal inquisitivecrystal self-assigned this Jan 2, 2022
@inquisitivecrystal inquisitivecrystal mentioned this issue Jan 3, 2022
Merged
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Jan 6, 2022
@matthiaskrgr
Rollup merge of rust-lang#92510 - inquisitivecrystal:foreign-block, r…
21fe214 
…=cjgillot

Don't resolve blocks in foreign functions

Although it is an error for a foreign function to have a block, it is still possible at the level of the AST. rust-lang#74204 made AST lowering skip over blocks belonging to foreign functions, since they're invalid. However, resolve still treated these blocks normally, resulting in a mismatch between the HIR and resolve, which could cause an ICE under certain circumstances. This PR changes resolve to skip over blocks belonging to foreign functions, as AST lowering does.

Fixes rust-lang#91370.

r? `@cjgillot`
@bors bors closed this as completed in 464a081 Jan 9, 2022
@github-actions github-actions bot mentioned this issue Jan 10, 2022
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@Badel2 Badel2 mentioned this issue Apr 8, 2022
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C-bug Category: This is a bug. glacier ICE tracked in rust-lang/glacier. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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Don't resolve blocks in foreign functions inquisitivecrystal/rust
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