Compiler crash with extensive use of const generics #126078

shosti · 2024-06-06T15:44:59Z

Code

I'm not sure where to start in terms of a minimal example, but the relevant code is https://github.com/shosti/tensrus/tree/compiler-bug (reproducible with cargo test). The code makes extensive use of adt_const_params and generic_const_exprs.

Error output

   Compiling tensrus v0.1.0 (/Users/shosti/src/tensrus)
error: internal compiler error: compiler/rustc_middle/src/ty/instance.rs:510:25: failed to resolve instance for <generic_tensor::GenericTensor<f64, 2, [2, 3, 0, 0, 0, 0]> as Add<view::View<'_, generic_tensor::GenericTensor<f64, 2, [2, 3, 0, 0, 0, 0]>>>>::add: Ok(
                                    None,
                                )

Backtrace

   Compiling tensrus v0.1.0 (/Users/shosti/src/tensrus)
error: internal compiler error: compiler/rustc_middle/src/ty/instance.rs:510:25: failed to resolve instance for <generic_tensor::GenericTensor<f64, 2, [2, 3, 0, 0, 0, 0]> as Add<view::View<'_, generic_tensor::GenericTensor<f64, 2, [2, 3, 0, 0, 0, 0]>>>>::add: Ok(
                                    None,
                                )

thread 'rustc' panicked at compiler/rustc_middle/src/ty/instance.rs:510:25:
Box<dyn Any>
stack backtrace:
   0: std::panicking::begin_panic::<rustc_errors::ExplicitBug>
   1: <rustc_errors::diagnostic::BugAbort as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
   2: rustc_middle::util::bug::opt_span_bug_fmt::<rustc_span::span_encoding::Span>::{closure#0}
   3: rustc_middle::ty::context::tls::with_opt::<rustc_middle::util::bug::opt_span_bug_fmt<rustc_span::span_encoding::Span>::{closure#0}, !>::{closure#0}
   4: rustc_middle::ty::context::tls::with_context_opt::<rustc_middle::ty::context::tls::with_opt<rustc_middle::util::bug::opt_span_bug_fmt<rustc_span::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
   5: rustc_middle::util::bug::bug_fmt
   6: <rustc_middle::ty::instance::Instance>::expect_resolve
   7: <rustc_monomorphize::collector::MirUsedCollector as rustc_middle::mir::visit::Visitor>::visit_terminator
   8: rustc_monomorphize::collector::collect_items_of_instance
   9: rustc_monomorphize::collector::collect_items_rec
  10: rustc_monomorphize::collector::collect_items_rec
  11: rustc_monomorphize::collector::collect_items_rec
  12: rustc_monomorphize::collector::collect_items_rec
  13: rustc_monomorphize::collector::collect_items_rec
  14: rustc_monomorphize::collector::collect_items_rec
  15: std::panicking::try::<(), core::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures::sync::parallel::enabled::par_for_each_in<rustc_middle::mir::mono::MonoItem, alloc::vec::Vec<rustc_middle::mir::mono::MonoItem>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#0}::{closure#0}>>
  16: <rustc_data_structures::sync::parallel::ParallelGuard>::run::<(), rustc_data_structures::sync::parallel::enabled::par_for_each_in<rustc_middle::mir::mono::MonoItem, alloc::vec::Vec<rustc_middle::mir::mono::MonoItem>, rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#1}::{closure#0}>
  17: <rustc_session::session::Session>::time::<(), rustc_monomorphize::collector::collect_crate_mono_items::{closure#1}>
  18: rustc_monomorphize::collector::collect_crate_mono_items
  19: rustc_monomorphize::partitioning::collect_and_partition_mono_items
      [... omitted 2 frames ...]
  20: rustc_codegen_ssa::base::codegen_crate::<rustc_codegen_llvm::LlvmCodegenBackend>
  21: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate
  22: <rustc_session::session::Session>::time::<alloc::boxed::Box<dyn core::any::Any>, rustc_interface::passes::start_codegen::{closure#0}>
  23: rustc_interface::passes::start_codegen
  24: <rustc_middle::ty::context::GlobalCtxt>::enter::<<rustc_interface::queries::Queries>::codegen_and_build_linker::{closure#0}, core::result::Result<rustc_interface::queries::Linker, rustc_span::ErrorGuaranteed>>
  25: <rustc_interface::queries::Queries>::codegen_and_build_linker
  26: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#0}::{closure#1}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

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: please attach the file at `/Users/shosti/src/tensrus/rustc-ice-2024-06-06T15_38_19-35349.txt` to your bug report

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C split-debuginfo=unpacked -C incremental=[REDACTED]

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

query stack during panic:
#0 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack
error: could not compile `tensrus` (lib test)

rustc-ice-2024-06-06T15_38_19-35349.txt

The text was updated successfully, but these errors were encountered:

workingjubilee · 2024-06-06T18:42:19Z

Sorry but this is an incomplete feature, so this is a known problem!

If you can extract a minimized version, that would be great!

pacak · 2024-06-07T17:03:11Z

A smaller example with no dependencies other than stdlib

https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=97c639b3e948103bea86d71f16bfc9c9

I'm still messing around with it, now it's down to 1.5kb

pacak · 2024-06-07T20:24:20Z

#![feature(generic_const_exprs)]

trait Tensor {
    const S: usize;
}

struct GenericTensor<const S: usize>;

impl<const S: usize> Tensor for GenericTensor<S> {
    const S: usize = S;
}

impl<const S: usize> GenericTensor<S> {
    fn forward(&self) {
        [View(GenericTensor::<S>), View(GenericTensor).into()];
    }
}

pub fn test_bcast_elem_add() {
    (GenericTensor::<0>).forward()
}

struct View<T>(T);

impl<Tn> From<View<GenericTensor<{ Tn::S }>>> for View<Tn>
where
    Tn: Tensor,
{
    fn from(_: View<GenericTensor<{ Tn::S }>>) -> Self {
        loop {}
    }
}

workingjubilee · 2024-06-07T20:40:03Z

neat!

theemathas · 2024-06-08T09:11:21Z

Minimized further:

#![feature(generic_const_exprs)]
#![allow(incomplete_features)]

trait Array {
    const SIZE: usize;
}
impl<const N: usize> Array for [i32; N] {
    const SIZE: usize = N;
}

// Note: Overlapping impls not detected by compiler
trait Reflexive<T> {
    fn reflexive() {}
}
impl<T> Reflexive<T> for T {}
impl<A: Array> Reflexive<[i32; A::SIZE]> for A {}

fn do_reflexive<const N: usize>() {
    <[i32; N]>::reflexive();
}
// Note: Load-bearing `pub`. Removing the pub stops the ICE.
pub fn what() {
    do_reflexive::<0>()
}

Compiler error

   Compiling playground v0.0.1 (/playground)
error: internal compiler error: compiler/rustc_middle/src/ty/instance.rs:510:25: failed to resolve instance for <[i32; 0] as Reflexive<[i32; 0]>>::reflexive: Ok(
                                    None,
                                )

thread 'rustc' panicked at compiler/rustc_middle/src/ty/instance.rs:510:25:
Box<dyn Any>
stack backtrace:
   0:     0x7f5499f58f15 - std::backtrace_rs::backtrace::libunwind::trace::h7d3c800091db3e91
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
   1:     0x7f5499f58f15 - std::backtrace_rs::backtrace::trace_unsynchronized::h4cc0a280c32586b8
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f5499f58f15 - std::sys_common::backtrace::_print_fmt::h9005d7a683a6d7a4
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f5499f58f15 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h519c17d5956798a6
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f5499fa9c5b - core::fmt::rt::Argument::fmt::haa193bfc28a485eb
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/core/src/fmt/rt.rs:165:63
   5:     0x7f5499fa9c5b - core::fmt::write::h355a93f02c4b3ea1
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/core/src/fmt/mod.rs:1168:21
   6:     0x7f5499f4dc9f - std::io::Write::write_fmt::hbe0fd00858f9c1ec
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/io/mod.rs:1835:15
   7:     0x7f5499f58cee - std::sys_common::backtrace::_print::h7fe7f477e21fa361
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f5499f58cee - std::sys_common::backtrace::print::h6c8dafcb53369ea1
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f5499f5b729 - std::panicking::default_hook::{{closure}}::hbcbc771124e8a531
  10:     0x7f5499f5b4ca - std::panicking::default_hook::ha99c0605f25db782
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/panicking.rs:298:9
  11:     0x7f549d1a4a00 - std[59958118404e088f]::panicking::update_hook::<alloc[25fe46b0aaca8953]::boxed::Box<rustc_driver_impl[2627b6be84d2f0c]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f5499f5be5b - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h4e37e0de343f25a5
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/alloc/src/boxed.rs:2077:9
  13:     0x7f5499f5be5b - std::panicking::rust_panic_with_hook::h6b51162bdfe57bbe
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/panicking.rs:799:13
  14:     0x7f549d1d5224 - std[59958118404e088f]::panicking::begin_panic::<rustc_errors[2ff0989c1584c7c0]::ExplicitBug>::{closure#0}
  15:     0x7f549d1d1d06 - std[59958118404e088f]::sys_common::backtrace::__rust_end_short_backtrace::<std[59958118404e088f]::panicking::begin_panic<rustc_errors[2ff0989c1584c7c0]::ExplicitBug>::{closure#0}, !>
  16:     0x7f549d1cd116 - std[59958118404e088f]::panicking::begin_panic::<rustc_errors[2ff0989c1584c7c0]::ExplicitBug>
  17:     0x7f549d1de841 - <rustc_errors[2ff0989c1584c7c0]::diagnostic::BugAbort as rustc_errors[2ff0989c1584c7c0]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  18:     0x7f549d6bb04c - rustc_middle[ce3fbd8192a3c5ff]::util::bug::opt_span_bug_fmt::<rustc_span[6bc65aeac19990f8]::span_encoding::Span>::{closure#0}
  19:     0x7f549d6a487a - rustc_middle[ce3fbd8192a3c5ff]::ty::context::tls::with_opt::<rustc_middle[ce3fbd8192a3c5ff]::util::bug::opt_span_bug_fmt<rustc_span[6bc65aeac19990f8]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  20:     0x7f549d6a46fb - rustc_middle[ce3fbd8192a3c5ff]::ty::context::tls::with_context_opt::<rustc_middle[ce3fbd8192a3c5ff]::ty::context::tls::with_opt<rustc_middle[ce3fbd8192a3c5ff]::util::bug::opt_span_bug_fmt<rustc_span[6bc65aeac19990f8]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  21:     0x7f549bb5dd70 - rustc_middle[ce3fbd8192a3c5ff]::util::bug::bug_fmt
  22:     0x7f549eb00f42 - <rustc_middle[ce3fbd8192a3c5ff]::ty::instance::Instance>::expect_resolve
  23:     0x7f549f3f7d5f - rustc_monomorphize[b056ba09cdf9a699]::collector::collect_items_rec::{closure#0}
  24:     0x7f549e66637f - rustc_monomorphize[b056ba09cdf9a699]::collector::collect_items_rec
  25:     0x7f549e666af6 - rustc_monomorphize[b056ba09cdf9a699]::collector::collect_items_rec
  26:     0x7f549effee27 - rustc_monomorphize[b056ba09cdf9a699]::partitioning::collect_and_partition_mono_items
  27:     0x7f549f3d3364 - rustc_query_impl[9fa61a5fc93b94b6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9fa61a5fc93b94b6]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ce3fbd8192a3c5ff]::query::erase::Erased<[u8; 24usize]>>
  28:     0x7f549f3d3349 - <rustc_query_impl[9fa61a5fc93b94b6]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2} as core[666eafb1203b88c6]::ops::function::FnOnce<(rustc_middle[ce3fbd8192a3c5ff]::ty::context::TyCtxt, ())>>::call_once
  29:     0x7f549f3d2f08 - rustc_query_system[8cc4c292d92d3869]::query::plumbing::try_execute_query::<rustc_query_impl[9fa61a5fc93b94b6]::DynamicConfig<rustc_query_system[8cc4c292d92d3869]::query::caches::SingleCache<rustc_middle[ce3fbd8192a3c5ff]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[9fa61a5fc93b94b6]::plumbing::QueryCtxt, false>
  30:     0x7f549f3d2c21 - rustc_query_impl[9fa61a5fc93b94b6]::query_impl::collect_and_partition_mono_items::get_query_non_incr::__rust_end_short_backtrace
  31:     0x7f549f0af509 - rustc_codegen_ssa[7de31db090aae023]::back::symbol_export::exported_symbols_provider_local
  32:     0x7f549e7533a5 - rustc_query_impl[9fa61a5fc93b94b6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9fa61a5fc93b94b6]::query_impl::exported_symbols::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ce3fbd8192a3c5ff]::query::erase::Erased<[u8; 16usize]>>
  33:     0x7f549e753373 - <rustc_query_impl[9fa61a5fc93b94b6]::query_impl::exported_symbols::dynamic_query::{closure#2} as core[666eafb1203b88c6]::ops::function::FnOnce<(rustc_middle[ce3fbd8192a3c5ff]::ty::context::TyCtxt, rustc_span[6bc65aeac19990f8]::def_id::CrateNum)>>::call_once
  34:     0x7f549f23b4b1 - rustc_query_system[8cc4c292d92d3869]::query::plumbing::try_execute_query::<rustc_query_impl[9fa61a5fc93b94b6]::DynamicConfig<rustc_query_system[8cc4c292d92d3869]::query::caches::VecCache<rustc_span[6bc65aeac19990f8]::def_id::CrateNum, rustc_middle[ce3fbd8192a3c5ff]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[9fa61a5fc93b94b6]::plumbing::QueryCtxt, false>
  35:     0x7f549f23b0ab - rustc_query_impl[9fa61a5fc93b94b6]::query_impl::exported_symbols::get_query_non_incr::__rust_end_short_backtrace
  36:     0x7f549f23adec - rustc_middle[ce3fbd8192a3c5ff]::query::plumbing::query_get_at::<rustc_query_system[8cc4c292d92d3869]::query::caches::VecCache<rustc_span[6bc65aeac19990f8]::def_id::CrateNum, rustc_middle[ce3fbd8192a3c5ff]::query::erase::Erased<[u8; 16usize]>>>
  37:     0x7f549ed6e9c0 - <rustc_metadata[d6f8184ef093beb3]::rmeta::encoder::EncodeContext>::encode_crate_root
  38:     0x7f549f5ef046 - rustc_metadata[d6f8184ef093beb3]::rmeta::encoder::encode_metadata
  39:     0x7f549f4255b2 - rustc_metadata[d6f8184ef093beb3]::fs::encode_and_write_metadata
  40:     0x7f549f42405e - rustc_interface[ed174d428a840afd]::passes::start_codegen
  41:     0x7f549f4237a8 - <rustc_interface[ed174d428a840afd]::queries::Queries>::codegen_and_build_linker
  42:     0x7f549f242332 - rustc_interface[ed174d428a840afd]::interface::run_compiler::<core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>, rustc_driver_impl[2627b6be84d2f0c]::run_compiler::{closure#0}>::{closure#1}
  43:     0x7f549f1f6009 - std[59958118404e088f]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[ed174d428a840afd]::util::run_in_thread_with_globals<rustc_interface[ed174d428a840afd]::util::run_in_thread_pool_with_globals<rustc_interface[ed174d428a840afd]::interface::run_compiler<core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>, rustc_driver_impl[2627b6be84d2f0c]::run_compiler::{closure#0}>::{closure#1}, core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>>::{closure#0}, core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>>
  44:     0x7f549f1f5dc0 - <<std[59958118404e088f]::thread::Builder>::spawn_unchecked_<rustc_interface[ed174d428a840afd]::util::run_in_thread_with_globals<rustc_interface[ed174d428a840afd]::util::run_in_thread_pool_with_globals<rustc_interface[ed174d428a840afd]::interface::run_compiler<core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>, rustc_driver_impl[2627b6be84d2f0c]::run_compiler::{closure#0}>::{closure#1}, core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>>::{closure#0}, core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>>::{closure#2} as core[666eafb1203b88c6]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  45:     0x7f5499f65e4b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h1f264a7d3d0a179d
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/alloc/src/boxed.rs:2063:9
  46:     0x7f5499f65e4b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h137c7bc9bcca4c45
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/alloc/src/boxed.rs:2063:9
  47:     0x7f5499f65e4b - std::sys::pal::unix::thread::Thread::new::thread_start::hf2fbd4f8eae045d7
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/sys/pal/unix/thread.rs:108:17
  48:     0x7f5499e73609 - start_thread
  49:     0x7f5499d96353 - clone
  50:                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 make sure that you have updated to the latest nightly

note: please attach the file at `/playground/rustc-ice-2024-06-08T09_09_04-50.txt` to your bug report

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

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

query stack during panic:
#0 [collect_and_partition_mono_items] collect_and_partition_mono_items
#1 [exported_symbols] collecting exported symbols for crate `0`
end of query stack
error: could not compile `playground` (lib)

matthiaskrgr · 2024-06-08T09:25:11Z

Looks like a duplicate of #119692

workingjubilee · 2024-06-08T19:11:28Z

Closing as duplicate then.

shosti 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 Jun 6, 2024

rustbot added the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label Jun 6, 2024

fmease added the A-monomorphization Area: Monomorphization label Jun 6, 2024

workingjubilee closed this as not planned Won't fix, can't repro, duplicate, stale Jun 8, 2024

workingjubilee mentioned this issue Jun 8, 2024

Conflicting trait impls cause ICE with generic_const_exprs #119692

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Compiler crash with extensive use of const generics #126078

Compiler crash with extensive use of const generics #126078

shosti commented Jun 6, 2024 •

edited

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workingjubilee commented Jun 6, 2024

pacak commented Jun 7, 2024 •

edited

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pacak commented Jun 7, 2024 •

edited

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workingjubilee commented Jun 7, 2024

theemathas commented Jun 8, 2024

matthiaskrgr commented Jun 8, 2024

workingjubilee commented Jun 8, 2024

Compiler crash with extensive use of const generics #126078

Compiler crash with extensive use of const generics #126078

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shosti commented Jun 6, 2024 • edited Loading

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workingjubilee commented Jun 6, 2024

pacak commented Jun 7, 2024 • edited Loading

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workingjubilee commented Jun 7, 2024

theemathas commented Jun 8, 2024

matthiaskrgr commented Jun 8, 2024

workingjubilee commented Jun 8, 2024

shosti commented Jun 6, 2024 •

edited

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pacak commented Jun 7, 2024 •

edited

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pacak commented Jun 7, 2024 •

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