leak_check in `rustc_const_eval::util::relate_types` by lcnr · Pull Request #155883 · rust-lang/rust

lcnr · 2026-04-27T15:09:50Z

fixes #155477. we should really figure out an API where people don't have to manually call leak_check for their code to be correct. I don't really know what that API should be for now, but the status quo sucks xx

same issue was recently fixed when checking that the return type of fn main implements Termination in #151377

r? BoxyUwU

rustbot · 2026-04-27T15:09:53Z

Some changes occurred to the CTFE machinery

cc @RalfJung, @oli-obk

rustbot · 2026-04-27T15:09:56Z

BoxyUwU is currently at their maximum review capacity.
They may take a while to respond.

RalfJung · 2026-04-27T15:31:00Z

+impl Trait for F1 {
+    type Assoc = i64;
+}
+#[expect(coherence_leak_check)]


What does this do...?

View changes since the review

it expects the coherence_leak_check lint. That lint is in a horrible state but fixing the lint doesn't seem too useful given that this thing is currently still in flux and updating it properly is non-trivial 😅

Ah, your fix makes this code emit a lint (#56105). That doesn't seem to make much sense but 🤷 sure whatever.

RalfJung · 2026-04-27T15:32:48Z

This is more of a const-eval interpreter problem than a transmute problem so IMO putting it in the "consts/const-eval" folder makes more sense. Or at least have "const" somewhere in the name so that it gets picked up by ./x test ui -- const.

View changes since the review

RalfJung · 2026-04-27T16:12:05Z

r=me based on the tests passing. Up to you if you want to get a review from someone who actually knows what all these type system queries do. ;)

RalfJung · 2026-04-27T16:12:44Z

-    ocx.evaluate_obligations_error_on_ambiguity().is_empty()
+
+    if ocx.evaluate_obligations_error_on_ambiguity().is_empty() {
+        infcx.leak_check(ty::UniverseIndex::ROOT, None).is_ok()


Suggested change

infcx.leak_check(ty::UniverseIndex::ROOT, None).is_ok()

// Ensure there are no pending lifetime constraints. This is needed to avoid issues like

// <https://github.com/rust-lang/rust/issues/155477>.

infcx.leak_check(ty::UniverseIndex::ROOT, None).is_ok()

View changes since the review

rust-log-analyzer · 2026-04-27T16:30:16Z

The job x86_64-gnu-miri failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

tests/pass/shims/x86/rounding-error.rs ... ok
tests/pass/shims/x86/intrinsics-x86-gfni.rs ... ok

FAILED TEST: tests/pass/issues/issue-91636.rs
command: MIRI_ENV_VAR_TEST="0" MIRI_TEMP="/tmp/miri-uitest-bGiBER" RUST_BACKTRACE="1" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/release/miri" "--error-format=json" "--sysroot=/checkout/obj/build/x86_64-unknown-linux-gnu/miri-sysroot" "-Dwarnings" "-Dunused" "-Ainternal_features" "-Zui-testing" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/tmp/miri_ui/0/tests/pass/issues" "tests/pass/issues/issue-91636.rs" "--edition" "2021"

error: test got exit status: 101, but expected 0
 = note: the compiler panicked

error: no output was expected
Execute `./miri test --bless` to update `tests/pass/issues/issue-91636.stderr` to the actual output
+++ <stderr output>
##[error]error: internal compiler error: compiler/rustc_mir_transform/src/validate.rs:82:25: broken MIR in Item(DefId(0:10 ~ issue_91636[d796]::main)) (after phase change to runtime-optimized) at bb2[10]:
                                Cannot Eq compare incompatible types fn(&str) and for<'a> fn(&'a str)
  --> tests/pass/issues/issue-91636.rs:22:13
   |
LL |     assert!(inner == func2.inner);
   |             ^^^^^^^^^^^^^^^^^^^^


thread 'rustc' (31200) panicked at compiler/rustc_mir_transform/src/validate.rs:82:25:
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_errors::DiagCtxtHandle>::span_bug::<rustc_span::span_encoding::Span, alloc::string::String>
   3: rustc_middle::util::bug::opt_span_bug_fmt::<rustc_span::span_encoding::Span>::{closure#0}
   4: 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::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}, !>
   6: rustc_middle::util::bug::span_bug_fmt::<rustc_span::span_encoding::Span>
   7: <rustc_mir_transform::validate::CfgChecker>::fail::<alloc::string::String>
   8: <rustc_mir_transform::validate::Validator as rustc_mir_transform::pass_manager::MirPass>::run_pass
   9: rustc_mir_transform::pass_manager::run_passes_inner
  10: rustc_mir_transform::run_optimization_passes
  11: rustc_mir_transform::optimized_mir
      [... omitted 1 frame ...]
  12: <rustc_middle::ty::context::TyCtxt>::instance_mir
  13: <rustc_const_eval::interpret::eval_context::InterpCx<miri::machine::MiriMachine>>::load_mir
  14: <rustc_const_eval::interpret::eval_context::InterpCx<miri::machine::MiriMachine>>::init_fn_call
  15: <rustc_const_eval::interpret::eval_context::InterpCx<miri::machine::MiriMachine> as miri::concurrency::thread::EvalContextExt>::run_threads
  16: miri::eval::eval_entry
  17: <miri::MiriCompilerCalls as rustc_driver_impl::Callbacks>::after_analysis
  18: <std::thread::local::LocalKey<core::cell::Cell<*const ()>>>::with::<rustc_middle::ty::context::tls::enter_context<<rustc_middle::ty::context::GlobalCtxt>::enter<rustc_interface::passes::create_and_enter_global_ctxt<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}, core::option::Option<rustc_interface::queries::Linker>>::{closure#1}, core::option::Option<rustc_interface::queries::Linker>>::{closure#0}, core::option::Option<rustc_interface::queries::Linker>>
  19: <rustc_middle::ty::context::TyCtxt>::create_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_interface::passes::create_and_enter_global_ctxt<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}>
  20: rustc_interface::passes::create_and_enter_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>
  21: std::panicking::catch_unwind::<(), core::panic::unwind_safe::AssertUnwindSafe<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}::{closure#0}>>
  22: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
  23: rustc_span::create_session_globals_then::<(), rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}::{closure#0}>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
---
           6: std::panic::catch_unwind::<&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe, i32>
               at /checkout/library/std/src/panic.rs:359:14: 359:40
           7: std::rt::lang_start_internal::{closure#0}
               at /checkout/library/std/src/rt.rs:175:24: 175:49
           8: std::panicking::catch_unwind::do_call::<{closure@std::rt::lang_start_internal::{closure#0}}, isize>
               at /checkout/library/std/src/panicking.rs:581:40: 581:43
           9: std::panicking::catch_unwind::<isize, {closure@std::rt::lang_start_internal::{closure#0}}>
               at /checkout/library/std/src/panicking.rs:544:19: 544:88
           10: std::panic::catch_unwind::<{closure@std::rt::lang_start_internal::{closure#0}}, isize>
               at /checkout/library/std/src/panic.rs:359:14: 359:40
           11: std::rt::lang_start_internal
               at /checkout/library/std/src/rt.rs:171:5: 193:7
           12: std::rt::lang_start::<()>
               at /checkout/library/std/src/rt.rs:205:5: 210:6

error: aborting due to 1 previous error



full stderr:
##[error]error: internal compiler error: compiler/rustc_mir_transform/src/validate.rs:82:25: broken MIR in Item(DefId(0:10 ~ issue_91636[d796]::main)) (after phase change to runtime-optimized) at bb2[10]:
                                Cannot Eq compare incompatible types fn(&str) and for<'a> fn(&'a str)
  --> tests/pass/issues/issue-91636.rs:22:13
   |
LL |     assert!(inner == func2.inner);
   |             ^^^^^^^^^^^^^^^^^^^^


thread 'rustc' (31200) panicked at compiler/rustc_mir_transform/src/validate.rs:82:25:
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_errors::DiagCtxtHandle>::span_bug::<rustc_span::span_encoding::Span, alloc::string::String>
   3: rustc_middle::util::bug::opt_span_bug_fmt::<rustc_span::span_encoding::Span>::{closure#0}
   4: 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::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}, !>
   6: rustc_middle::util::bug::span_bug_fmt::<rustc_span::span_encoding::Span>
   7: <rustc_mir_transform::validate::CfgChecker>::fail::<alloc::string::String>
   8: <rustc_mir_transform::validate::Validator as rustc_mir_transform::pass_manager::MirPass>::run_pass
   9: rustc_mir_transform::pass_manager::run_passes_inner
  10: rustc_mir_transform::run_optimization_passes
  11: rustc_mir_transform::optimized_mir
      [... omitted 1 frame ...]
  12: <rustc_middle::ty::context::TyCtxt>::instance_mir
  13: <rustc_const_eval::interpret::eval_context::InterpCx<miri::machine::MiriMachine>>::load_mir
  14: <rustc_const_eval::interpret::eval_context::InterpCx<miri::machine::MiriMachine>>::init_fn_call
  15: <rustc_const_eval::interpret::eval_context::InterpCx<miri::machine::MiriMachine> as miri::concurrency::thread::EvalContextExt>::run_threads
  16: miri::eval::eval_entry
  17: <miri::MiriCompilerCalls as rustc_driver_impl::Callbacks>::after_analysis
  18: <std::thread::local::LocalKey<core::cell::Cell<*const ()>>>::with::<rustc_middle::ty::context::tls::enter_context<<rustc_middle::ty::context::GlobalCtxt>::enter<rustc_interface::passes::create_and_enter_global_ctxt<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}, core::option::Option<rustc_interface::queries::Linker>>::{closure#1}, core::option::Option<rustc_interface::queries::Linker>>::{closure#0}, core::option::Option<rustc_interface::queries::Linker>>
  19: <rustc_middle::ty::context::TyCtxt>::create_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_interface::passes::create_and_enter_global_ctxt<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}>
  20: rustc_interface::passes::create_and_enter_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>
  21: std::panicking::catch_unwind::<(), core::panic::unwind_safe::AssertUnwindSafe<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}::{closure#0}>>
  22: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
  23: rustc_span::create_session_globals_then::<(), rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}::{closure#0}>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
---
           6: std::panic::catch_unwind::<&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe, i32>
               at /checkout/library/std/src/panic.rs:359:14: 359:40
           7: std::rt::lang_start_internal::{closure#0}
               at /checkout/library/std/src/rt.rs:175:24: 175:49
           8: std::panicking::catch_unwind::do_call::<{closure@std::rt::lang_start_internal::{closure#0}}, isize>
               at /checkout/library/std/src/panicking.rs:581:40: 581:43
           9: std::panicking::catch_unwind::<isize, {closure@std::rt::lang_start_internal::{closure#0}}>
               at /checkout/library/std/src/panicking.rs:544:19: 544:88
           10: std::panic::catch_unwind::<{closure@std::rt::lang_start_internal::{closure#0}}, isize>
               at /checkout/library/std/src/panic.rs:359:14: 359:40
           11: std::rt::lang_start_internal
               at /checkout/library/std/src/rt.rs:171:5: 193:7
           12: std::rt::lang_start::<()>
               at /checkout/library/std/src/rt.rs:205:5: 210:6
---
Location:
   /cargo/registry/src/index.crates.io-1949cf8c6b5b557f/ui_test-0.30.4/src/lib.rs:365

  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BACKTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   1: <color_eyre[82049ded8b6f9271]::config::EyreHook>::into_eyre_hook::{closure#0}<unknown>
      at <unknown source file>:<unknown line>
   2: eyre[689ce6b39f555f44]::capture_handler<unknown>
      at <unknown source file>:<unknown line>
   3: eyre[689ce6b39f555f44]::private::format_err<unknown>
      at <unknown source file>:<unknown line>
   4: ui_test[ff3c4e7c479aadfe]::run_tests_generic::<ui_test[ff3c4e7c479aadfe]::default_file_filter, ui[c9285b315d303088]::run_tests::{closure#1}, alloc[e1717d5dfa861f71]::boxed::Box<dyn ui_test[ff3c4e7c479aadfe]::status_emitter::StatusEmitter>><unknown>
      at <unknown source file>:<unknown line>
   5: ui[c9285b315d303088]::ui<unknown>
      at <unknown source file>:<unknown line>
   6: ui[c9285b315d303088]::main<unknown>
      at <unknown source file>:<unknown line>
   7: std[f4afd3c4f6550485]::sys::backtrace::__rust_begin_short_backtrace::<fn() -> core[3bb4dc30e3001f2c]::result::Result<(), eyre[689ce6b39f555f44]::Report>, core[3bb4dc30e3001f2c]::result::Result<(), eyre[689ce6b39f555f44]::Report>><unknown>
      at <unknown source file>:<unknown line>
   8: std[f4afd3c4f6550485]::rt::lang_start::<core[3bb4dc30e3001f2c]::result::Result<(), eyre[689ce6b39f555f44]::Report>>::{closure#0}<unknown>
      at <unknown source file>:<unknown line>
   9: std[f4afd3c4f6550485]::rt::lang_start_internal<unknown>
      at <unknown source file>:<unknown line>
  10: main<unknown>
      at <unknown source file>:<unknown line>
  11: __libc_start_main<unknown>
      at <unknown source file>:<unknown line>
  12: _start<unknown>
      at <unknown source file>:<unknown line>

Run with COLORBT_SHOW_HIDDEN=1 environment variable to disable frame filtering.
Run with RUST_BACKTRACE=full to include source snippets.
error: test failed, to rerun pass `--test ui`

Caused by:
  process didn't exit successfully: `/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/release/deps/ui-0690611caa40c7fd` (exit status: 1)
Bootstrap failed while executing `test --stage 2 src/tools/miri src/tools/miri/cargo-miri`
Command `/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo test -Zwarnings --target x86_64-unknown-linux-gnu -Zbinary-dep-depinfo -j 4 -Zroot-dir=/checkout --locked --color=always --profile=release --manifest-path /checkout/src/tools/miri/Cargo.toml -- [workdir=/checkout]` failed with exit code 1
Created at: src/bootstrap/src/core/build_steps/tool.rs:191:21
Executed at: src/bootstrap/src/core/build_steps/test.rs:740:19

--- BACKTRACE vvv
   0: <bootstrap::utils::exec::DeferredCommand>::finish_process
             at /checkout/src/bootstrap/src/utils/exec.rs:939:17
   1: <bootstrap::utils::exec::DeferredCommand>::wait_for_output::<&bootstrap::utils::exec::ExecutionContext>
             at /checkout/src/bootstrap/src/utils/exec.rs:831:21
   2: <bootstrap::utils::exec::ExecutionContext>::run
             at /checkout/src/bootstrap/src/utils/exec.rs:741:45
   3: <bootstrap::utils::exec::BootstrapCommand>::run::<&bootstrap::core::builder::Builder>
             at /checkout/src/bootstrap/src/utils/exec.rs:339:27
   4: <bootstrap::core::build_steps::test::Miri as bootstrap::core::builder::Step>::run
             at /checkout/src/bootstrap/src/core/build_steps/test.rs:740:19
   5: <bootstrap::core::builder::Builder>::ensure::<bootstrap::core::build_steps::test::Miri>
             at /checkout/src/bootstrap/src/core/builder/mod.rs:1579:36
   6: <bootstrap::core::build_steps::test::Miri as bootstrap::core::builder::Step>::make_run
             at /checkout/src/bootstrap/src/core/build_steps/test.rs:666:21
   7: <bootstrap::core::builder::StepDescription>::maybe_run
             at /checkout/src/bootstrap/src/core/builder/mod.rs:476:13
   8: bootstrap::core::builder::cli_paths::match_paths_to_steps_and_run
             at /checkout/src/bootstrap/src/core/builder/cli_paths.rs:232:18
   9: <bootstrap::core::builder::Builder>::run_step_descriptions
             at /checkout/src/bootstrap/src/core/builder/mod.rs:1122:9
  10: <bootstrap::core::builder::Builder>::execute_cli
             at /checkout/src/bootstrap/src/core/builder/mod.rs:1101:14
  11: <bootstrap::Build>::build
             at /checkout/src/bootstrap/src/lib.rs:803:25
  12: bootstrap::main
             at /checkout/src/bootstrap/src/bin/main.rs:130:11
  13: <fn() as core::ops::function::FnOnce<()>>::call_once
             at /rustc/ef0fb8a2563200e322fa4419f09f65a63742038c/library/core/src/ops/function.rs:250:5
  14: std::sys::backtrace::__rust_begin_short_backtrace::<fn(), ()>
             at /rustc/ef0fb8a2563200e322fa4419f09f65a63742038c/library/std/src/sys/backtrace.rs:166:18
  15: std::rt::lang_start::<()>::{closure#0}
             at /rustc/ef0fb8a2563200e322fa4419f09f65a63742038c/library/std/src/rt.rs:206:18
  16: <&dyn core::ops::function::Fn<(), Output = i32> + core::marker::Sync + core::panic::unwind_safe::RefUnwindSafe as core::ops::function::FnOnce<()>>::call_once
             at /rustc/ef0fb8a2563200e322fa4419f09f65a63742038c/library/core/src/ops/function.rs:287:21
  17: std::panicking::catch_unwind::do_call::<&dyn core::ops::function::Fn<(), Output = i32> + core::marker::Sync + core::panic::unwind_safe::RefUnwindSafe, i32>
             at /rustc/ef0fb8a2563200e322fa4419f09f65a63742038c/library/std/src/panicking.rs:581:40
  18: std::panicking::catch_unwind::<i32, &dyn core::ops::function::Fn<(), Output = i32> + core::marker::Sync + core::panic::unwind_safe::RefUnwindSafe>
             at /rustc/ef0fb8a2563200e322fa4419f09f65a63742038c/library/std/src/panicking.rs:544:19
  19: std::panic::catch_unwind::<&dyn core::ops::function::Fn<(), Output = i32> + core::marker::Sync + core::panic::unwind_safe::RefUnwindSafe, i32>
             at /rustc/ef0fb8a2563200e322fa4419f09f65a63742038c/library/std/src/panic.rs:359:14
  20: std::rt::lang_start_internal::{closure#0}
             at /rustc/ef0fb8a2563200e322fa4419f09f65a63742038c/library/std/src/rt.rs:175:24
  21: std::panicking::catch_unwind::do_call::<std::rt::lang_start_internal::{closure#0}, isize>
             at /rustc/ef0fb8a2563200e322fa4419f09f65a63742038c/library/std/src/panicking.rs:581:40
---
  28: __libc_start_main
  29: _start


Command has failed. Rerun with -v to see more details.
Build completed unsuccessfully in 0:40:56
  local time: Mon Apr 27 16:21:27 UTC 2026
  network time: Mon, 27 Apr 2026 16:21:27 GMT
##[error]Process completed with exit code 1.
##[group]Run echo "disk usage:"

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Apr 27, 2026

rustbot assigned BoxyUwU Apr 27, 2026

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RalfJung reviewed Apr 27, 2026

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Comment thread tests/ui/transmute/equal-up-to-leak-check.rs Outdated

RalfJung reviewed Apr 27, 2026

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leak_check in rustc_const_eval::util::relate_types

715e75d

lcnr force-pushed the relate_types-leak-check branch from de223eb to 715e75d Compare April 27, 2026 15:35

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leak_check in `rustc_const_eval::util::relate_types`#155883

leak_check in `rustc_const_eval::util::relate_types`#155883
lcnr wants to merge 1 commit intorust-lang:mainfrom
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RalfJung commented Apr 27, 2026

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rust-log-analyzer commented Apr 27, 2026

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lcnr commented Apr 27, 2026 •

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