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[ICE] thread 'rustc' panicked at compiler/rustc_errors/src/diagnostic.rs:1025:9 #147255

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#147416
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[ICE] thread 'rustc' panicked at compiler/rustc_errors/src/diagnostic.rs:1025:9#147255
#147416
Labels
A-diagnosticsArea: Messages for errors, warnings, and lintsC-bugCategory: This is a bug.E-needs-bisectionCall for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustcI-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.requires-debug-assertionsThis issue requires a build of rustc or tooling with debug-assertions in some way

Description

@ym-xie
ym-xie
opened on Oct 2, 2025

Code

fn main() {
    let mut x = 4;
    let  x_str = {
        format!("{}", x);
        //()
    };
    println!("{}", x_str);
}

Meta

rustc --version --verbose(dd7fda5):

rustc 1.92.0-dev
binary: rustc
commit-hash: unknown
commit-date: unknown
host: aarch64-apple-darwin
release: 1.92.0-dev
LLVM version: 21.1.1

It requires debug assertions.

Error output

<no output>
Backtrace 

thread 'rustc' panicked at /private/var/tmp/code.1mIq4m/rust/compiler/rustc_errors/src/diagnostic.rs:1025:9:
Span must not be empty and have no suggestion
stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/std/src/panicking.rs:697:5
   1: core::panicking::panic_fmt
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/core/src/panicking.rs:75:14
   2: span_suggestion_with_style<rustc_span::ErrorGuaranteed, &str, &str>
             at ./rust/compiler/rustc_errors/src/diagnostic.rs:1025:9
   3: check_for_binding_assigned_block_without_tail_expression
             at ./rust/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs:958:17
   4: report_selection_error
             at ./rust/compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs:325:30
   5: report_fulfillment_error
             at ./rust/compiler/rustc_trait_selection/src/error_reporting/traits/mod.rs:271:71
   6: report_fulfillment_errors
             at ./rust/compiler/rustc_trait_selection/src/error_reporting/traits/mod.rs:228:37
   7: select_obligations_where_possible<rustc_hir_typeck::fn_ctxt::_impl::{impl#0}::resolve_ty_and_res_fully_qualified_call::{closure#0}::{closure_env#1}>
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs:667:29
   8: check_argument_types
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs:404:22
   9: confirm_builtin_call
             at ./rust/compiler/rustc_hir_typeck/src/callee.rs:574:14
  10: check_expr_call
             at ./rust/compiler/rustc_hir_typeck/src/callee.rs:131:22
  11: check_expr_kind
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:575:50
  12: {closure#0}
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:282:23
  13: maybe_grow<rustc_middle::ty::Ty, rustc_hir_typeck::expr::{impl#0}::check_expr_with_expectation_and_args::{closure_env#0}>
             at /Users/xieym/.cargo/registry/src/mirrors.tuna.tsinghua.edu.cn-4dc01642fd091eda/stacker-0.1.21/src/lib.rs:57:9
  14: ensure_sufficient_stack<rustc_middle::ty::Ty, rustc_hir_typeck::expr::{impl#0}::check_expr_with_expectation_and_args::{closure_env#0}>
             at ./rust/compiler/rustc_data_structures/src/stack.rs:21:5
  15: check_expr_with_expectation_and_args
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:277:18
  16: check_expr_with_expectation
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:222:14
  17: check_expr_with_hint
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:177:14
  18: check_expr_array
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:1828:33
  19: check_expr_kind
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:591:43
  20: {closure#0}
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:282:23
  21: maybe_grow<rustc_middle::ty::Ty, rustc_hir_typeck::expr::{impl#0}::check_expr_with_expectation_and_args::{closure_env#0}>
             at /Users/xieym/.cargo/registry/src/mirrors.tuna.tsinghua.edu.cn-4dc01642fd091eda/stacker-0.1.21/src/lib.rs:57:9
  22: ensure_sufficient_stack<rustc_middle::ty::Ty, rustc_hir_typeck::expr::{impl#0}::check_expr_with_expectation_and_args::{closure_env#0}>
             at ./rust/compiler/rustc_data_structures/src/stack.rs:21:5
  23: check_expr_with_expectation_and_args
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:277:18
  24: check_expr_with_expectation
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:222:14
  25: check_expr_coercible_to_type_or_error<rustc_hir_typeck::expr::{impl#0}::check_expr_coercible_to_type::{closure_env#0}>
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:153:23
  26: check_expr_coercible_to_type
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:143:14
  27: check_decl_initializer
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs:865:18
  28: check_decl
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs:875:32
  29: check_decl_local
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs:910:23
  30: check_stmt
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs:934:22
  31: {closure#0}
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs:1015:22
  32: with_breakable_ctxt<rustc_hir_typeck::fn_ctxt::checks::{impl#0}::check_expr_block::{closure_env#0}, ()>
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs:1533:22
  33: check_expr_block
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs:1013:31
  34: check_expr_kind
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:574:46
  35: {closure#0}
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:282:23
  36: maybe_grow<rustc_middle::ty::Ty, rustc_hir_typeck::expr::{impl#0}::check_expr_with_expectation_and_args::{closure_env#0}>
             at /Users/xieym/.cargo/registry/src/mirrors.tuna.tsinghua.edu.cn-4dc01642fd091eda/stacker-0.1.21/src/lib.rs:57:9
  37: ensure_sufficient_stack<rustc_middle::ty::Ty, rustc_hir_typeck::expr::{impl#0}::check_expr_with_expectation_and_args::{closure_env#0}>
             at ./rust/compiler/rustc_data_structures/src/stack.rs:21:5
  38: check_expr_with_expectation_and_args
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:277:18
  39: check_expr_with_expectation
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:222:14
  40: {closure#1}
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs:343:35
  41: check_argument_types
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs:440:34
  42: confirm_builtin_call
             at ./rust/compiler/rustc_hir_typeck/src/callee.rs:574:14
  43: check_expr_call
             at ./rust/compiler/rustc_hir_typeck/src/callee.rs:131:22
  44: check_expr_kind
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:575:50
  45: {closure#0}
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:282:23
  46: maybe_grow<rustc_middle::ty::Ty, rustc_hir_typeck::expr::{impl#0}::check_expr_with_expectation_and_args::{closure_env#0}>
             at /Users/xieym/.cargo/registry/src/mirrors.tuna.tsinghua.edu.cn-4dc01642fd091eda/stacker-0.1.21/src/lib.rs:57:9
  47: ensure_sufficient_stack<rustc_middle::ty::Ty, rustc_hir_typeck::expr::{impl#0}::check_expr_with_expectation_and_args::{closure_env#0}>
             at ./rust/compiler/rustc_data_structures/src/stack.rs:21:5
  48: check_expr_with_expectation_and_args
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:277:18
  49: check_expr_with_expectation
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:222:14
  50: check_expr
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:201:14
  51: check_stmt
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs:962:31
  52: {closure#0}
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs:1015:22
  53: with_breakable_ctxt<rustc_hir_typeck::fn_ctxt::checks::{impl#0}::check_expr_block::{closure_env#0}, ()>
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs:1533:22
  54: check_expr_block
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs:1013:31
  55: check_expr_kind
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:574:46
  56: {closure#0}
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:282:23
  57: maybe_grow<rustc_middle::ty::Ty, rustc_hir_typeck::expr::{impl#0}::check_expr_with_expectation_and_args::{closure_env#0}>
             at /Users/xieym/.cargo/registry/src/mirrors.tuna.tsinghua.edu.cn-4dc01642fd091eda/stacker-0.1.21/src/lib.rs:57:9
  58: ensure_sufficient_stack<rustc_middle::ty::Ty, rustc_hir_typeck::expr::{impl#0}::check_expr_with_expectation_and_args::{closure_env#0}>
             at ./rust/compiler/rustc_data_structures/src/stack.rs:21:5
  59: check_expr_with_expectation_and_args
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:277:18
  60: check_expr_with_expectation
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:222:14
  61: check_expr
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:201:14
  62: check_stmt
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs:962:31
  63: {closure#0}
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs:1015:22
  64: with_breakable_ctxt<rustc_hir_typeck::fn_ctxt::checks::{impl#0}::check_expr_block::{closure_env#0}, ()>
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs:1533:22
  65: check_expr_block
             at ./rust/compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs:1013:31
  66: check_expr_kind
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:574:46
  67: {closure#0}
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:282:23
  68: maybe_grow<rustc_middle::ty::Ty, rustc_hir_typeck::expr::{impl#0}::check_expr_with_expectation_and_args::{closure_env#0}>
             at /Users/xieym/.cargo/registry/src/mirrors.tuna.tsinghua.edu.cn-4dc01642fd091eda/stacker-0.1.21/src/lib.rs:57:9
  69: ensure_sufficient_stack<rustc_middle::ty::Ty, rustc_hir_typeck::expr::{impl#0}::check_expr_with_expectation_and_args::{closure_env#0}>
             at ./rust/compiler/rustc_data_structures/src/stack.rs:21:5
  70: check_expr_with_expectation_and_args
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:277:18
  71: check_expr_with_expectation
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:222:14
  72: check_expr_with_hint
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:177:14
  73: check_return_or_body_tail
             at ./rust/compiler/rustc_hir_typeck/src/expr.rs:1131:35
  74: check_fn
             at ./rust/compiler/rustc_hir_typeck/src/check.rs:130:9
  75: {closure#0}
             at ./rust/compiler/rustc_hir_typeck/src/lib.rs:181:9
  76: typeck_with_inspect
             at ./rust/compiler/rustc_hir_typeck/src/lib.rs:106:1
  77: {closure#0}
             at ./rust/compiler/rustc_query_impl/src/plumbing.rs:294:9
      [... omitted 22 frames ...]
  78: query_ensure<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>, rustc_query_system::dep_graph::graph::DepNodeIndex>>
             at ./rust/compiler/rustc_middle/src/query/plumbing.rs:198:9
  79: typeck<rustc_span::def_id::LocalDefId>
             at ./rust/compiler/rustc_middle/src/query/plumbing.rs:233:9
  80: {closure#2}
             at ./rust/compiler/rustc_hir_analysis/src/lib.rs:243:29
  81: {closure#0}<rustc_hir_analysis::check_crate::{closure_env#2}>
             at ./rust/compiler/rustc_middle/src/hir/map.rs:340:79
  82: {closure#0}<&rustc_span::def_id::LocalDefId, &[rustc_span::def_id::LocalDefId], rustc_middle::hir::map::{impl#3}::par_hir_body_owners::{closure_env#0}<rustc_hir_analysis::check_crate::{closure_env#2}>>
             at ./rust/compiler/rustc_data_structures/src/sync/parallel.rs:181:30
  83: call_once<(), rustc_data_structures::sync::parallel::par_for_each_in::{closure#0}::{closure#1}::{closure_env#0}<&rustc_span::def_id::LocalDefId, &[rustc_span::def_id::LocalDefId], rustc_middle::hir::map::{impl#3}::par_hir_body_owners::{closure_env#0}<rustc_hir_analysis::check_crate::{closure_env#2}>>>
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/core/src/panic/unwind_safe.rs:272:9
  84: do_call<core::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures::sync::parallel::par_for_each_in::{closure#0}::{closure#1}::{closure_env#0}<&rustc_span::def_id::LocalDefId, &[rustc_span::def_id::LocalDefId], rustc_middle::hir::map::{impl#3}::par_hir_body_owners::{closure_env#0}<rustc_hir_analysis::check_crate::{closure_env#2}>>>, ()>
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/std/src/panicking.rs:589:40
  85: catch_unwind<(), core::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures::sync::parallel::par_for_each_in::{closure#0}::{closure#1}::{closure_env#0}<&rustc_span::def_id::LocalDefId, &[rustc_span::def_id::LocalDefId], rustc_middle::hir::map::{impl#3}::par_hir_body_owners::{closure_env#0}<rustc_hir_analysis::check_crate::{closure_env#2}>>>>
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/std/src/panicking.rs:552:19
  86: catch_unwind<core::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures::sync::parallel::par_for_each_in::{closure#0}::{closure#1}::{closure_env#0}<&rustc_span::def_id::LocalDefId, &[rustc_span::def_id::LocalDefId], rustc_middle::hir::map::{impl#3}::par_hir_body_owners::{closure_env#0}<rustc_hir_analysis::check_crate::{closure_env#2}>>>, ()>
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/std/src/panic.rs:359:14
  87: run<(), rustc_data_structures::sync::parallel::par_for_each_in::{closure#0}::{closure#1}::{closure_env#0}<&rustc_span::def_id::LocalDefId, &[rustc_span::def_id::LocalDefId], rustc_middle::hir::map::{impl#3}::par_hir_body_owners::{closure_env#0}<rustc_hir_analysis::check_crate::{closure_env#2}>>>
             at ./rust/compiler/rustc_data_structures/src/sync/parallel.rs:23:9
  88: {closure#1}<&rustc_span::def_id::LocalDefId, &[rustc_span::def_id::LocalDefId], rustc_middle::hir::map::{impl#3}::par_hir_body_owners::{closure_env#0}<rustc_hir_analysis::check_crate::{closure_env#2}>>
             at ./rust/compiler/rustc_data_structures/src/sync/parallel.rs:181:23
  89: for_each<rustc_span::def_id::LocalDefId, rustc_data_structures::sync::parallel::par_for_each_in::{closure#0}::{closure_env#1}<&rustc_span::def_id::LocalDefId, &[rustc_span::def_id::LocalDefId], rustc_middle::hir::map::{impl#3}::par_hir_body_owners::{closure_env#0}<rustc_hir_analysis::check_crate::{closure_env#2}>>>
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/core/src/slice/iter/macros.rs:277:21
  90: {closure#0}<&rustc_span::def_id::LocalDefId, &[rustc_span::def_id::LocalDefId], rustc_middle::hir::map::{impl#3}::par_hir_body_owners::{closure_env#0}<rustc_hir_analysis::check_crate::{closure_env#2}>>
             at ./rust/compiler/rustc_data_structures/src/sync/parallel.rs:180:27
  91: parallel_guard<(), rustc_data_structures::sync::parallel::par_for_each_in::{closure_env#0}<&rustc_span::def_id::LocalDefId, &[rustc_span::def_id::LocalDefId], rustc_middle::hir::map::{impl#3}::par_hir_body_owners::{closure_env#0}<rustc_hir_analysis::check_crate::{closure_env#2}>>>
             at ./rust/compiler/rustc_data_structures/src/sync/parallel.rs:39:15
  92: par_for_each_in<&rustc_span::def_id::LocalDefId, &[rustc_span::def_id::LocalDefId], rustc_middle::hir::map::{impl#3}::par_hir_body_owners::{closure_env#0}<rustc_hir_analysis::check_crate::{closure_env#2}>>
             at ./rust/compiler/rustc_data_structures/src/sync/parallel.rs:175:5
  93: par_hir_body_owners<rustc_hir_analysis::check_crate::{closure_env#2}>
             at ./rust/compiler/rustc_middle/src/hir/map.rs:340:9
  94: check_crate
             at ./rust/compiler/rustc_hir_analysis/src/lib.rs:221:9
  95: run_required_analyses
             at ./rust/compiler/rustc_interface/src/passes.rs:1082:5
  96: analysis
             at ./rust/compiler/rustc_interface/src/passes.rs:1143:5
  97: {closure#0}
             at ./rust/compiler/rustc_query_impl/src/plumbing.rs:294:9
      [... omitted 22 frames ...]
  98: query_ensure<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 0]>>>
             at ./rust/compiler/rustc_middle/src/query/plumbing.rs:198:9
  99: analysis
             at ./rust/compiler/rustc_middle/src/query/plumbing.rs:233:9
 100: {closure#2}
             at ./rust/compiler/rustc_driver_impl/src/lib.rs:371:29
 101: {closure#0}<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure_env#2}>
             at ./rust/compiler/rustc_interface/src/passes.rs:1017:27
 102: {closure#1}<rustc_interface::passes::create_and_enter_global_ctxt::{closure#2}::{closure_env#0}<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure_env#2}>, core::option::Option<rustc_interface::queries::Linker>>
             at ./rust/compiler/rustc_middle/src/ty/context.rs:1619:37
 103: {closure#0}<rustc_middle::ty::context::{impl#21}::enter::{closure_env#1}<rustc_interface::passes::create_and_enter_global_ctxt::{closure#2}::{closure_env#0}<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure_env#2}>, core::option::Option<rustc_interface::queries::Linker>>, core::option::Option<rustc_interface::queries::Linker>>
             at ./rust/compiler/rustc_middle/src/ty/context/tls.rs:60:9
 104: try_with<core::cell::Cell<*const ()>, rustc_middle::ty::context::tls::enter_context::{closure_env#0}<rustc_middle::ty::context::{impl#21}::enter::{closure_env#1}<rustc_interface::passes::create_and_enter_global_ctxt::{closure#2}::{closure_env#0}<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure_env#2}>, core::option::Option<rustc_interface::queries::Linker>>, core::option::Option<rustc_interface::queries::Linker>>, core::option::Option<rustc_interface::queries::Linker>>
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/std/src/thread/local.rs:315:12
 105: with<core::cell::Cell<*const ()>, rustc_middle::ty::context::tls::enter_context::{closure_env#0}<rustc_middle::ty::context::{impl#21}::enter::{closure_env#1}<rustc_interface::passes::create_and_enter_global_ctxt::{closure#2}::{closure_env#0}<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure_env#2}>, core::option::Option<rustc_interface::queries::Linker>>, core::option::Option<rustc_interface::queries::Linker>>, core::option::Option<rustc_interface::queries::Linker>>
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/std/src/thread/local.rs:279:20
 106: enter_context<rustc_middle::ty::context::{impl#21}::enter::{closure_env#1}<rustc_interface::passes::create_and_enter_global_ctxt::{closure#2}::{closure_env#0}<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure_env#2}>, core::option::Option<rustc_interface::queries::Linker>>, core::option::Option<rustc_interface::queries::Linker>>
             at ./rust/compiler/rustc_middle/src/ty/context/tls.rs:57:9
 107: enter<rustc_interface::passes::create_and_enter_global_ctxt::{closure#2}::{closure_env#0}<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure_env#2}>, core::option::Option<rustc_interface::queries::Linker>>
             at ./rust/compiler/rustc_middle/src/ty/context.rs:1619:9
 108: create_global_ctxt<core::option::Option<rustc_interface::queries::Linker>, rustc_interface::passes::create_and_enter_global_ctxt::{closure#2}::{closure_env#0}<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure_env#2}>>
             at ./rust/compiler/rustc_middle/src/ty/context.rs:1824:13
 109: {closure#2}<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure_env#2}>
             at ./rust/compiler/rustc_interface/src/passes.rs:984:9
 110: call_once<rustc_interface::passes::create_and_enter_global_ctxt::{closure_env#2}<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure_env#2}>, (&rustc_session::session::Session, rustc_middle::ty::context::CurrentGcx, alloc::sync::Arc<rustc_data_structures::jobserver::Proxy, alloc::alloc::Global>, &std::sync::once_lock::OnceLock<rustc_middle::ty::context::GlobalCtxt>, &rustc_data_structures::sync::worker_local::WorkerLocal<rustc_middle::arena::Arena>, &rustc_data_structures::sync::worker_local::WorkerLocal<rustc_hir::Arena>, rustc_driver_impl::run_compiler::{closure#0}::{closure_env#2})>
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/core/src/ops/function.rs:253:5
 111: call_once<(&rustc_session::session::Session, rustc_middle::ty::context::CurrentGcx, alloc::sync::Arc<rustc_data_structures::jobserver::Proxy, alloc::alloc::Global>, &std::sync::once_lock::OnceLock<rustc_middle::ty::context::GlobalCtxt>, &rustc_data_structures::sync::worker_local::WorkerLocal<rustc_middle::arena::Arena>, &rustc_data_structures::sync::worker_local::WorkerLocal<rustc_hir::Arena>, rustc_driver_impl::run_compiler::{closure#0}::{closure_env#2}), dyn core::ops::function::FnOnce<(&rustc_session::session::Session, rustc_middle::ty::context::CurrentGcx, alloc::sync::Arc<rustc_data_structures::jobserver::Proxy, alloc::alloc::Global>, &std::sync::once_lock::OnceLock<rustc_middle::ty::context::GlobalCtxt>, &rustc_data_structures::sync::worker_local::WorkerLocal<rustc_middle::arena::Arena>, &rustc_data_structures::sync::worker_local::WorkerLocal<rustc_hir::Arena>, rustc_driver_impl::run_compiler::{closure#0}::{closure_env#2}), Output=core::option::Option<rustc_interface::queries::Linker>>, alloc::alloc::Global>
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/alloc/src/boxed.rs:1971:9
 112: create_and_enter_global_ctxt<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure_env#2}>
             at ./rust/compiler/rustc_interface/src/passes.rs:1025:5
 113: {closure#0}
             at ./rust/compiler/rustc_driver_impl/src/lib.rs:344:22
 114: {closure#0}<(), rustc_driver_impl::run_compiler::{closure_env#0}>
             at ./rust/compiler/rustc_interface/src/interface.rs:531:80
 115: call_once<(), rustc_interface::interface::run_compiler::{closure#1}::{closure_env#0}<(), rustc_driver_impl::run_compiler::{closure_env#0}>>
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/core/src/panic/unwind_safe.rs:272:9
 116: do_call<core::panic::unwind_safe::AssertUnwindSafe<rustc_interface::interface::run_compiler::{closure#1}::{closure_env#0}<(), rustc_driver_impl::run_compiler::{closure_env#0}>>, ()>
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/std/src/panicking.rs:589:40
 117: catch_unwind<(), core::panic::unwind_safe::AssertUnwindSafe<rustc_interface::interface::run_compiler::{closure#1}::{closure_env#0}<(), rustc_driver_impl::run_compiler::{closure_env#0}>>>
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/std/src/panicking.rs:552:19
 118: catch_unwind<core::panic::unwind_safe::AssertUnwindSafe<rustc_interface::interface::run_compiler::{closure#1}::{closure_env#0}<(), rustc_driver_impl::run_compiler::{closure_env#0}>>, ()>
             at /rustc/788da80fcfcef3f34c90def5baa32813e39a1a41/library/std/src/panic.rs:359:14
 119: {closure#1}<(), rustc_driver_impl::run_compiler::{closure_env#0}>
             at ./rust/compiler/rustc_interface/src/interface.rs:531:23
 120: {closure#0}<rustc_interface::interface::run_compiler::{closure_env#1}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>
             at ./rust/compiler/rustc_interface/src/util.rs:200:17
 121: {closure#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#1}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()>
             at ./rust/compiler/rustc_interface/src/util.rs:154:24
 122: set<rustc_span::SessionGlobals, rustc_interface::util::run_in_thread_with_globals::{closure#0}::{closure#0}::{closure_env#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#1}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()>, ()>
             at /Users/xieym/.cargo/registry/src/mirrors.tuna.tsinghua.edu.cn-4dc01642fd091eda/scoped-tls-1.0.1/src/lib.rs:137:9
 123: create_session_globals_then<(), rustc_interface::util::run_in_thread_with_globals::{closure#0}::{closure#0}::{closure_env#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#1}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()>>
             at ./rust/compiler/rustc_span/src/lib.rs:146:21
 124: {closure#0}<rustc_interface::util::run_in_thread_pool_with_globals::{closure_env#0}<rustc_interface::interface::run_compiler::{closure_env#1}<(), rustc_driver_impl::run_compiler::{closure_env#0}>, ()>, ()>
             at ./rust/compiler/rustc_interface/src/util.rs:150:17
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

error: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: please make sure that you have updated to the latest nightly

note: please attach the file at `/private/var/tmp/code.1mIq4m/rustc-ice-2025-10-02T04_28_54-28336.txt` to your bug report

query stack during panic:
#0 [typeck] type-checking `main`
#1 [analysis] running analysis passes on this crate
end of query stack

Activity

  1. ym-xie
    added
    I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
    T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.
    C-bugCategory: This is a bug.
    on Oct 2, 2025
  2. rustbot
    added
    needs-triageThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triaging
    on Oct 2, 2025

  3. ym-xie commented on Oct 2, 2025

    @ym-xie
    ym-xie
    on Oct 2, 2025
    Author

    @rustbot label +requires-debug-assertions

  4. rustbot
    added
    requires-debug-assertionsThis issue requires a build of rustc or tooling with debug-assertions in some way
    on Oct 2, 2025
  5. jieyouxu
    added
    E-needs-bisectionCall for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustc
    A-diagnosticsArea: Messages for errors, warnings, and lints
    and removed
    needs-triageThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triaging
    on Oct 2, 2025

  6. Kivooeo commented on Oct 2, 2025

    @Kivooeo
    Kivooeo
    on Oct 2, 2025
    Member

    Is that reproducable on playground? Because from what I see currently nightly build with debug build is not ICEing on playing ground

  7. jieyouxu commented on Oct 2, 2025

    @jieyouxu
    jieyouxu
    on Oct 2, 2025 · Hidden as off-topic

  8. jieyouxu commented on Oct 2, 2025

    @jieyouxu
    jieyouxu
    on Oct 2, 2025 · Hidden as off-topic

  9. Kivooeo commented on Oct 2, 2025

    @Kivooeo
    Kivooeo
    on Oct 2, 2025
    Member

    Do we really need this debug_assert here?

    rust/compiler/rustc_errors/src/diagnostic.rs

    Lines 1025 to 1028 in 42b384e

    debug_assert!(
    !(sp.is_empty() && suggestion.to_string().is_empty()),
    "Span must not be empty and have no suggestion"
    );

    Because if I remove it then it does work as before :D

  10. jieyouxu commented on Oct 2, 2025

    @jieyouxu
    jieyouxu
    on Oct 2, 2025
    Member

    Yes, that's the entire point of that debug assertion. Empty spans (with no sugestions) are a bug, best they indicate one with diagnostics logic, worse they could be a symptom of a more serious logic bug.

  11. Kivooeo commented on Oct 2, 2025

    @Kivooeo
    Kivooeo
    on Oct 2, 2025
    Member

    Using this instead of just stmt.span.with_lo(tail_expr.span.hi())

                let span = if stmt.span.with_lo(tail_expr.span.hi()).is_empty() {
                stmt.span
            } else {
                stmt.span.with_lo(tail_expr.span.hi())
            };

    Do fix the problem, but I really wonder what could happen that this started to ICE, that's very weird

    Is there any chance that this was ICEing even before and we just don't have test for such case that will break this "span arithmetic"

    edit: well, no, if nightly is not panicking then it means that it's something new

    edit2: nightly in playground is without debug assertaion so it does not representing anything

  12. ym-xie commented on Oct 2, 2025

    @ym-xie
    ym-xie
    on Oct 2, 2025
    Author

    Does nightly build with debug-assertions? the playground doesn't seem to have it #144501 (comment)

  13. Kivooeo commented on Oct 2, 2025

    @Kivooeo
    Kivooeo
    on Oct 2, 2025
    Member

    I guess so, see this example

  14. ym-xie commented on Oct 2, 2025

    @ym-xie
    ym-xie
    on Oct 2, 2025 · Hidden as resolved
    Author

  15. fmease commented on Oct 2, 2025

    @fmease
    fmease
    on Oct 2, 2025
    Member

    I guess so, see this example

    No, that just demonstrates that the compiler builds the playground crate with debug assertions enabled (and optimizations off) because the default mode / profile is debug; see the big dropdown button at the top.

    This does not demonstrate that the compiler itself was compiled with debug assertions.

    Nightly / beta / stable releases were not compiled with debug assertions. IINM on all release channels, the compiler build is a full release / dist build, hence optimized and no debug assertions.

  16. Kivooeo commented on Oct 2, 2025

    @Kivooeo
    Kivooeo
    on Oct 2, 2025
    Member

    This does not demonstrate that the compiler itself was compiled with debug assertions

    Oh, I see, thanks for explanation

  17. Kivooeo commented on Oct 2, 2025

    @Kivooeo
    Kivooeo
    on Oct 2, 2025
    Member

    Is this the same reason why cargo-bisect-rustc can't bisect this one? Because it downloads binaries without debug-assertation?

  18. Kivooeo commented on Oct 2, 2025

    @Kivooeo
    Kivooeo
    on Oct 2, 2025
    Member

    Is there any chance that this was ICEing even before and we just don't have test for such case that will break this "span arithmetic"

    I now leaning more into this theory, can I somehow (if so, how?) test more older compiler versions and build it with debug assertation to see if this issue was before or it's a new one

    edit: git reset --hard commit should work fine

  19. fmease commented on Oct 2, 2025

    @fmease
    fmease
    on Oct 2, 2025
    Member

    Is this the same reason why cargo-bisect-rustc can't bisect this one? Because it downloads binaries without debug-assertation?

    Very likely, yes. cargo-bisect-rustc merely downloads existing artifacts from static.rust-lang.org. While bisecting it initially only checks nightly builds (by default at least) (which were compiled in release / dist mode as established).

    Now, cargo-bisect-rustc also downloads available historical try-builds (created via @bors try for unrelated reasons, e.g., perf, crater) to bisect within rollups (and maybe other situations). It's possible that these try-builds were actually compiled in debug mode but I'm not sure. In any case, it doesn't really matter for initial bisections.

  20. Kivooeo commented on Oct 2, 2025

    @Kivooeo
    Kivooeo
    on Oct 2, 2025
    Member

    Sorry for a long reply, I fall asleep on another llvm build... because they are unavailable for old rustc version to donwload

    Well, I found out that the last version where it does ICE is 1.86, 1.85 is fine

    So, @fmease, what do you think, just use another span (as I show above) when this one is empty is reasonable solution?

    Because at some situations like this they are equal which turns out in empty span, it seems to me that I can just use one of them in such cases?

    stmt.span: /home/gh-Kivooeo/rust/library/alloc/src/macros.rs:107:9: 109:11 (#4)
tail_expr.span: /home/gh-Kivooeo/rust/library/alloc/src/macros.rs:107:9: 109:11 (#4)

    I ran a ./x test ui with solution above and there is no tests failed

  21. jhpratt
    added a commit that references this issue on Nov 7, 2025

    Rollup merge of rust-lang#147416 - Kivooeo:ice-fix23456, r=fmease

    7af1ee3
  22. bors
    closed this as completedin 7af1ee3on Nov 7, 2025
  23. rust-timer
    added a commit that references this issue on Nov 7, 2025

    Unrolled build for #147416

    b5e490b
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    A-diagnosticsArea: Messages for errors, warnings, and lintsC-bugCategory: This is a bug.E-needs-bisectionCall for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustcI-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.requires-debug-assertionsThis issue requires a build of rustc or tooling with debug-assertions in some way

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