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ICE: symbol_names: unsupported constant of type 'str', -Cinstrument-coverage #116303

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matthiaskrgr opened this issue Oct 1, 2023 · 5 comments · Fixed by #130344
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ICE: symbol_names: unsupported constant of type 'str', -Cinstrument-coverage #116303

matthiaskrgr opened this issue Oct 1, 2023 · 5 comments · Fixed by #130344
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@Jaic1
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A-code-coverage Area: Source-based code coverage (-Cinstrument-coverage) C-bug Category: This is a bug. F-adt_const_params `#![feature(adt_const_params)]` 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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@matthiaskrgr
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matthiaskrgr commented Oct 1, 2023 •
edited by rustbot
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Code

rustc -Cinstrument-coverage

#![feature(adt_const_params)]

#[derive(PartialEq, Eq)]
struct MyStr(str);
impl std::marker::ConstParamTy for MyStr {}

fn function_with_my_str<const S: &'static MyStr>() -> &'static MyStr {
    S
}

impl MyStr {
    const fn new(s: &'static str) -> &'static MyStr {
        unsafe { std::mem::transmute(s) }
    }
}

pub fn main() {
    let f = function_with_my_str::<{ MyStr::new("hello") }>();
}

Meta

rustc --version --verbose:

rustc 1.74.0-nightly (8ce4540bd 2023-09-29)
binary: rustc
commit-hash: 8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72
commit-date: 2023-09-29
host: x86_64-unknown-linux-gnu
release: 1.74.0-nightly
LLVM version: 17.0.2

Error output

<output>
Backtrace 

error: internal compiler error: compiler/rustc_symbol_mangling/src/v0.rs:722:17: symbol_names: unsupported constant of type `str` (Branch([Leaf(0x68), Leaf(0x65), Leaf(0x6c), Leaf(0x6c), Leaf(0x6f)]): str)

thread 'rustc' panicked at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/compiler/rustc_errors/src/lib.rs:1651:9:
Box<dyn Any>
stack backtrace:
   0:     0x7f4cc936433c - std::backtrace_rs::backtrace::libunwind::trace::h2047b82b78957b16
                               at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f4cc936433c - std::backtrace_rs::backtrace::trace_unsynchronized::he06321801fe2ac72
                               at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f4cc936433c - std::sys_common::backtrace::_print_fmt::h3028a39ff66599c0
                               at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7f4cc936433c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hd2dc6ab4971909d6
                               at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f4cc93c9f9c - core::fmt::rt::Argument::fmt::hae02ab67a447b751
                               at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/core/src/fmt/rt.rs:138:9
   5:     0x7f4cc93c9f9c - core::fmt::write::h156c0157377de849
                               at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/core/src/fmt/mod.rs:1114:21
   6:     0x7f4cc93570be - std::io::Write::write_fmt::hfda671e33214dbc9
                               at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/std/src/io/mod.rs:1763:15
   7:     0x7f4cc9364124 - std::sys_common::backtrace::_print::he2b418ab91e1b6bc
                               at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f4cc9364124 - std::sys_common::backtrace::print::h39dd53e781dbe62d
                               at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f4cc9367003 - std::panicking::default_hook::{{closure}}::hac1d0be96ef52b84
                               at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/std/src/panicking.rs:272:22
  10:     0x7f4cc9366d24 - std::panicking::default_hook::h430f734618200aae
                               at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/std/src/panicking.rs:292:9
  11:     0x7f4ccc4f681f - std[9021ab7eb1800470]::panicking::update_hook::<alloc[b36931eabff6d458]::boxed::Box<rustc_driver_impl[3b155c69176e0130]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f4cc9367831 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h0ec3fa0b3629c93a
                               at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/alloc/src/boxed.rs:2021:9
  13:     0x7f4cc9367831 - std::panicking::rust_panic_with_hook::hdb0a7131bd1f25e3
                               at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/std/src/panicking.rs:735:13
  14:     0x7f4ccca3b134 - std[9021ab7eb1800470]::panicking::begin_panic::<rustc_errors[33aeeeb1830e9238]::ExplicitBug>::{closure#0}
  15:     0x7f4ccca3a026 - std[9021ab7eb1800470]::sys_common::backtrace::__rust_end_short_backtrace::<std[9021ab7eb1800470]::panicking::begin_panic<rustc_errors[33aeeeb1830e9238]::ExplicitBug>::{closure#0}, !>
  16:     0x7f4ccca836a6 - std[9021ab7eb1800470]::panicking::begin_panic::<rustc_errors[33aeeeb1830e9238]::ExplicitBug>
  17:     0x7f4ccca1bd24 - <rustc_errors[33aeeeb1830e9238]::HandlerInner>::bug::<alloc[b36931eabff6d458]::string::String>
  18:     0x7f4ccca1bbd6 - <rustc_errors[33aeeeb1830e9238]::Handler>::bug::<alloc[b36931eabff6d458]::string::String>
  19:     0x7f4cccac4ebc - rustc_middle[7d6c6611b495d02e]::util::bug::opt_span_bug_fmt::<rustc_span[a848110e357b7e8b]::span_encoding::Span>::{closure#0}
  20:     0x7f4cccac1eda - rustc_middle[7d6c6611b495d02e]::ty::context::tls::with_opt::<rustc_middle[7d6c6611b495d02e]::util::bug::opt_span_bug_fmt<rustc_span[a848110e357b7e8b]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7f4cccac1ea8 - rustc_middle[7d6c6611b495d02e]::ty::context::tls::with_context_opt::<rustc_middle[7d6c6611b495d02e]::ty::context::tls::with_opt<rustc_middle[7d6c6611b495d02e]::util::bug::opt_span_bug_fmt<rustc_span[a848110e357b7e8b]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7f4ccacf7b60 - rustc_middle[7d6c6611b495d02e]::util::bug::bug_fmt
  23:     0x7f4cccf832c4 - <&mut rustc_symbol_mangling[4bc03a9729e5166e]::v0::SymbolMangler as rustc_middle[7d6c6611b495d02e]::ty::print::Printer>::print_const
  24:     0x7f4cccf8300d - <&mut rustc_symbol_mangling[4bc03a9729e5166e]::v0::SymbolMangler as rustc_middle[7d6c6611b495d02e]::ty::print::Printer>::print_const
  25:     0x7f4cccf82c49 - <&mut rustc_symbol_mangling[4bc03a9729e5166e]::v0::SymbolMangler as rustc_middle[7d6c6611b495d02e]::ty::print::Printer>::print_const
  26:     0x7f4cccf83823 - <&mut rustc_symbol_mangling[4bc03a9729e5166e]::v0::SymbolMangler as rustc_middle[7d6c6611b495d02e]::ty::print::Printer>::path_generic_args::<<&mut rustc_symbol_mangling[4bc03a9729e5166e]::v0::SymbolMangler as rustc_middle[7d6c6611b495d02e]::ty::print::Printer>::default_print_def_path::{closure#2}>
  27:     0x7f4cccf80f7d - <&mut rustc_symbol_mangling[4bc03a9729e5166e]::v0::SymbolMangler as rustc_middle[7d6c6611b495d02e]::ty::print::Printer>::print_def_path
  28:     0x7f4cccf7fde2 - rustc_symbol_mangling[4bc03a9729e5166e]::v0::mangle
  29:     0x7f4ccaee9275 - rustc_symbol_mangling[4bc03a9729e5166e]::symbol_name_provider
  30:     0x7f4cca6188c6 - rustc_query_impl[fe2b8f031e651193]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[fe2b8f031e651193]::query_impl::symbol_name::dynamic_query::{closure#2}::{closure#0}, rustc_middle[7d6c6611b495d02e]::query::erase::Erased<[u8; 16usize]>>
  31:     0x7f4ccb43edce - rustc_query_system[dfd8d19a16263799]::query::plumbing::try_execute_query::<rustc_query_impl[fe2b8f031e651193]::DynamicConfig<rustc_query_system[dfd8d19a16263799]::query::caches::DefaultCache<rustc_middle[7d6c6611b495d02e]::ty::instance::Instance, rustc_middle[7d6c6611b495d02e]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[fe2b8f031e651193]::plumbing::QueryCtxt, false>
  32:     0x7f4ccb43ea03 - rustc_query_impl[fe2b8f031e651193]::query_impl::symbol_name::get_query_non_incr::__rust_end_short_backtrace
  33:     0x7f4ccb9d684f - <&mut rustc_monomorphize[825a039f47682177]::partitioning::assert_symbols_are_distinct<std[9021ab7eb1800470]::collections::hash::set::Iter<rustc_middle[7d6c6611b495d02e]::mir::mono::MonoItem>>::{closure#0} as core[eac01cc03d7c90b2]::ops::function::FnOnce<(&rustc_middle[7d6c6611b495d02e]::mir::mono::MonoItem,)>>::call_once
  34:     0x7f4ccb9d5c14 - <alloc[b36931eabff6d458]::vec::Vec<(&rustc_middle[7d6c6611b495d02e]::mir::mono::MonoItem, rustc_middle[7d6c6611b495d02e]::ty::SymbolName)> as alloc[b36931eabff6d458]::vec::spec_from_iter::SpecFromIter<(&rustc_middle[7d6c6611b495d02e]::mir::mono::MonoItem, rustc_middle[7d6c6611b495d02e]::ty::SymbolName), core[eac01cc03d7c90b2]::iter::adapters::map::Map<std[9021ab7eb1800470]::collections::hash::set::Iter<rustc_middle[7d6c6611b495d02e]::mir::mono::MonoItem>, rustc_monomorphize[825a039f47682177]::partitioning::assert_symbols_are_distinct<std[9021ab7eb1800470]::collections::hash::set::Iter<rustc_middle[7d6c6611b495d02e]::mir::mono::MonoItem>>::{closure#0}>>>::from_iter
  35:     0x7f4ccb9d48e5 - rustc_monomorphize[825a039f47682177]::partitioning::assert_symbols_are_distinct::<std[9021ab7eb1800470]::collections::hash::set::Iter<rustc_middle[7d6c6611b495d02e]::mir::mono::MonoItem>>
  36:     0x7f4ccb9d4514 - rustc_data_structures[82d39ef94a006aa1]::sync::parallel::disabled::join::<rustc_monomorphize[825a039f47682177]::partitioning::collect_and_partition_mono_items::{closure#0}::{closure#0}, rustc_monomorphize[825a039f47682177]::partitioning::collect_and_partition_mono_items::{closure#0}::{closure#1}, &[rustc_middle[7d6c6611b495d02e]::mir::mono::CodegenUnit], ()>
  37:     0x7f4ccb9d3b44 - <rustc_session[76460c32d01a7a92]::session::Session>::time::<(&[rustc_middle[7d6c6611b495d02e]::mir::mono::CodegenUnit], ()), rustc_monomorphize[825a039f47682177]::partitioning::collect_and_partition_mono_items::{closure#0}>
  38:     0x7f4ccb9d252d - rustc_monomorphize[825a039f47682177]::partitioning::collect_and_partition_mono_items
  39:     0x7f4ccbadfde9 - rustc_query_impl[fe2b8f031e651193]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[fe2b8f031e651193]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2}::{closure#0}, rustc_middle[7d6c6611b495d02e]::query::erase::Erased<[u8; 24usize]>>
  40:     0x7f4ccbadfdbd - <rustc_query_impl[fe2b8f031e651193]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2} as core[eac01cc03d7c90b2]::ops::function::FnOnce<(rustc_middle[7d6c6611b495d02e]::ty::context::TyCtxt, ())>>::call_once
  41:     0x7f4ccbc54b57 - rustc_query_system[dfd8d19a16263799]::query::plumbing::try_execute_query::<rustc_query_impl[fe2b8f031e651193]::DynamicConfig<rustc_query_system[dfd8d19a16263799]::query::caches::SingleCache<rustc_middle[7d6c6611b495d02e]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[fe2b8f031e651193]::plumbing::QueryCtxt, false>
  42:     0x7f4ccbe6df92 - rustc_query_impl[fe2b8f031e651193]::query_impl::collect_and_partition_mono_items::get_query_non_incr::__rust_end_short_backtrace
  43:     0x7f4ccb6e6e3b - rustc_codegen_ssa[5d19c6e4c53e5d1a]::base::codegen_crate::<rustc_codegen_llvm[2437d065f7431]::LlvmCodegenBackend>
  44:     0x7f4ccb6e6c3f - <rustc_codegen_llvm[2437d065f7431]::LlvmCodegenBackend as rustc_codegen_ssa[5d19c6e4c53e5d1a]::traits::backend::CodegenBackend>::codegen_crate
  45:     0x7f4ccba3ad22 - <rustc_session[76460c32d01a7a92]::session::Session>::time::<alloc[b36931eabff6d458]::boxed::Box<dyn core[eac01cc03d7c90b2]::any::Any>, rustc_interface[6d526cf79e1d2a3f]::passes::start_codegen::{closure#0}>
  46:     0x7f4ccba3a87b - rustc_interface[6d526cf79e1d2a3f]::passes::start_codegen
  47:     0x7f4ccba3509a - <rustc_middle[7d6c6611b495d02e]::ty::context::GlobalCtxt>::enter::<<rustc_interface[6d526cf79e1d2a3f]::queries::Queries>::ongoing_codegen::{closure#0}, core[eac01cc03d7c90b2]::result::Result<alloc[b36931eabff6d458]::boxed::Box<dyn core[eac01cc03d7c90b2]::any::Any>, rustc_span[a848110e357b7e8b]::ErrorGuaranteed>>
  48:     0x7f4ccba33f4d - rustc_span[a848110e357b7e8b]::set_source_map::<core[eac01cc03d7c90b2]::result::Result<(), rustc_span[a848110e357b7e8b]::ErrorGuaranteed>, rustc_interface[6d526cf79e1d2a3f]::interface::run_compiler<core[eac01cc03d7c90b2]::result::Result<(), rustc_span[a848110e357b7e8b]::ErrorGuaranteed>, rustc_driver_impl[3b155c69176e0130]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  49:     0x7f4ccba2e180 - std[9021ab7eb1800470]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[6d526cf79e1d2a3f]::util::run_in_thread_with_globals<rustc_interface[6d526cf79e1d2a3f]::interface::run_compiler<core[eac01cc03d7c90b2]::result::Result<(), rustc_span[a848110e357b7e8b]::ErrorGuaranteed>, rustc_driver_impl[3b155c69176e0130]::run_compiler::{closure#1}>::{closure#0}, core[eac01cc03d7c90b2]::result::Result<(), rustc_span[a848110e357b7e8b]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[eac01cc03d7c90b2]::result::Result<(), rustc_span[a848110e357b7e8b]::ErrorGuaranteed>>
  50:     0x7f4ccbd5758e - <<std[9021ab7eb1800470]::thread::Builder>::spawn_unchecked_<rustc_interface[6d526cf79e1d2a3f]::util::run_in_thread_with_globals<rustc_interface[6d526cf79e1d2a3f]::interface::run_compiler<core[eac01cc03d7c90b2]::result::Result<(), rustc_span[a848110e357b7e8b]::ErrorGuaranteed>, rustc_driver_impl[3b155c69176e0130]::run_compiler::{closure#1}>::{closure#0}, core[eac01cc03d7c90b2]::result::Result<(), rustc_span[a848110e357b7e8b]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[eac01cc03d7c90b2]::result::Result<(), rustc_span[a848110e357b7e8b]::ErrorGuaranteed>>::{closure#1} as core[eac01cc03d7c90b2]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  51:     0x7f4cc9372395 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h002abea1d29efb77
                               at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/alloc/src/boxed.rs:2007:9
  52:     0x7f4cc9372395 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::ha19d8c26cc20d38b
                               at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/alloc/src/boxed.rs:2007:9
  53:     0x7f4cc9372395 - std::sys::unix::thread::Thread::new::thread_start::h6dc2d5714dd5ad65
                               at /rustc/8ce4540bd6fe7d58d4bc05f1b137d61937d3cf72/library/std/src/sys/unix/thread.rs:108:17
  54:     0x7f4cc908c9eb - <unknown>
  55:     0x7f4cc9110dfc - <unknown>
  56:                0x0 - <unknown>

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 attach the file at `/tmp/o/icemaker_reduced/rustc-ice-2023-10-01T00:20:12.752923254Z-1264038.txt` to your bug report

note: compiler flags: -C instrument-coverage

query stack during panic:
#0 [symbol_name] computing the symbol for `function_with_my_str::<&MyStr(Branch([Leaf(0x68), Leaf(0x65), Leaf(0x6c), Leaf(0x6c), Leaf(0x6f)]))>`
#1 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack
error: aborting due to previous error; 2 warnings emitted

@matthiaskrgr matthiaskrgr added 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. C-bug Category: This is a bug. A-code-coverage Area: Source-based code coverage (-Cinstrument-coverage) F-adt_const_params `#![feature(adt_const_params)]` labels Oct 1, 2023
@rustbot rustbot added the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label Oct 1, 2023
@saethlin saethlin removed the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label Oct 1, 2023
@matthiaskrgr
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Regression in nightly-2023-05-04
Regression in 7b99493
Regression in rust-lang-ci@9a0b251

@matthiaskrgr matthiaskrgr mentioned this issue Oct 1, 2023
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@Zalathar
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I tracked this down to the fact that -Cinstrument-coverage implicitly sets -Csymbol-mangling-version=v0:

rust/compiler/rustc_session/src/config.rs

Lines 2769 to 2782 in 45a45c6

// `-C instrument-coverage` implies `-C symbol-mangling-version=v0` - to ensure consistent
// and reversible name mangling. Note, LLVM coverage tools can analyze coverage over
// multiple runs, including some changes to source code; so mangled names must be consistent
// across compilations.
match cg.symbol_mangling_version {
None => cg.symbol_mangling_version = Some(SymbolManglingVersion::V0),
Some(SymbolManglingVersion::Legacy) => {
handler.early_warn(
"-C instrument-coverage requires symbol mangling version `v0`, \
but `-C symbol-mangling-version=legacy` was specified",
);
}
Some(SymbolManglingVersion::V0) => {}
}

I can reproduce with just -Csymbol-mangling-version=v0 on its own, without -Cinstrument-coverage.

Conversely, if I modify the wrapper function Session::instrument_coverage to pretend that coverage is always off, then the problem still occurs.

So I believe this is actually an incompatibility between adt_const_params and v0 symbol mangling.

@BoxyUwU BoxyUwU mentioned this issue Aug 13, 2024
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@Jaic1
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Jaic1 commented Sep 1, 2024

@rustbot claim

@Jaic1
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Jaic1 commented Sep 1, 2024

With #127722, the original code causing the ICE should be updated as:

#![feature(unsized_const_params)]

#[derive(PartialEq, Eq)]
struct MyStr(str);
impl std::marker::UnsizedConstParamTy for MyStr {}

fn function_with_my_str<const S: &'static MyStr>() -> &'static MyStr {
    S
}

impl MyStr {
    const fn new(s: &'static str) -> &'static MyStr {
        unsafe { std::mem::transmute(s) }
    }
}

pub fn main() {
    let f = function_with_my_str::<{ MyStr::new("hello") }>();
}

@Jaic1
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Jaic1 commented Sep 1, 2024

Also the F-adt_const_params label for this issue should be replaced with F-unsized_const_params. Cc @BoxyUwU

@Zalathar Zalathar mentioned this issue Sep 5, 2024
Open
@Jaic1 Jaic1 mentioned this issue Sep 14, 2024
Merged
workingjubilee added a commit to workingjubilee/rustc that referenced this issue Sep 23, 2024
@workingjubilee
Rollup merge of rust-lang#130344 - Jaic1:fix-116306, r=BoxyUwU
76afa09 
Handle unsized consts with type `str`  in v0 symbol mangling

This PR fixes rust-lang#116303 by handling consts with type `str` in v0 symbol mangling as partial support for unsized consts.

This PR is related to `#![feature(adt_const_params)]` (rust-lang#95174) and `#![feature(unsized_const_params)]` (rust-lang#128028).

r? `@BoxyUwU`
@bors bors closed this as completed in 23393de Sep 23, 2024
rust-timer added a commit to rust-lang-ci/rust that referenced this issue Sep 23, 2024
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Unrolled build for rust-lang#130344
16d0ee7 
Rollup merge of rust-lang#130344 - Jaic1:fix-116306, r=BoxyUwU

Handle unsized consts with type `str`  in v0 symbol mangling

This PR fixes rust-lang#116303 by handling consts with type `str` in v0 symbol mangling as partial support for unsized consts.

This PR is related to `#![feature(adt_const_params)]` (rust-lang#95174) and `#![feature(unsized_const_params)]` (rust-lang#128028).

r? ``@BoxyUwU``
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A-code-coverage Area: Source-based code coverage (-Cinstrument-coverage) C-bug Category: This is a bug. F-adt_const_params `#![feature(adt_const_params)]` 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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Handle unsized consts with type str in v0 symbol mangling Jaic1/rust
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@matthiaskrgr @saethlin @Zalathar @Jaic1 @rustbot