thread 'rustc' panicked at rust-nightly/compiler/rustc_errors/src/diagnostic.rs:1006:9

[wxie7]

I tried this code:

use rand::{thread_rng, Rng};
use std::env;
use std::fs::{self, File};
use std::io::{self, Read, Write};
use std::process::{Command, Stdio};
use std::sync::{Arc, Mutex};
use std::thread;
use std::time::{Duration, Instant};
fn main() {
    let args: Vec<String> = env::args().collect();
    let now = Instant::now();
    let data = fs::read_to_string(&args[1].replace("v2", "")).expect("Unable to open the file");
    let mut v = data;
    for _i in 0..10 {
        v = v
            .chars()
            .filter(|x| !x.is_whitespace())
            .map(|x| {
                println!("Child spawned with the size: {}", x);
            })
            .collect::<String>();
    }
    fs::write(&args[1].replace(".txt", "v3"), v).expect("Unable to write");
    println!("{}s to complete", now.elapsed().as_secs_f32());
}

I expected to see this happen: explanation

Instead, this happened: explanation

Meta

rustc --version --verbose:

commit-date: unknown
host: x86_64-unknown-linux-gnu
release: 1.85.0-dev
LLVM version: 19.1.4

Backtrace

thread 'rustc' panicked at /data/xieym/workspace/rust/rust-nightly/compiler/rustc_errors/src/diagnostic.rs:1006:9:
Span must not be empty and have no suggestion
stack backtrace:
   0:     0x7fbedf28dead - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h51e5276f25f67b8a
   1:     0x7fbedf347ea3 - core::fmt::write::h0a73bee6158cdbf1
   2:     0x7fbedf2b4309 - std::io::Write::write_fmt::h206d582822858877
   3:     0x7fbedf28dd53 - std::sys::backtrace::BacktraceLock::print::h84a9a4c750ade733
   4:     0x7fbedf2c46fc - std::panicking::default_hook::{{closure}}::h216e29259e3d5cff
   5:     0x7fbedf2c44c5 - std::panicking::default_hook::h03ce982d60640bc4
   6:     0x7fbedab6be42 - <alloc[7c2d8435141f8e1e]::boxed::Box<rustc_driver_impl[d7b86d9e63f9aaed]::install_ice_hook::{closure#0}> as core[dcda4f281d996093]::ops::function::Fn<(&dyn for<'a, 'b> core[dcda4f281d996093]::ops::function::Fn<(&'a std[31742bae037c253]::panic::PanicHookInfo<'b>,), Output = ()> + core[dcda4f281d996093]::marker::Send + core[dcda4f281d996093]::marker::Sync, &std[31742bae037c253]::panic::PanicHookInfo)>>::call
   7:     0x7fbedf2c4e68 - std::panicking::rust_panic_with_hook::h88b680004200a63a
   8:     0x7fbedf28e33a - std::panicking::begin_panic_handler::{{closure}}::ha56090df9488ab86
   9:     0x7fbedf28e169 - std::sys::backtrace::__rust_end_short_backtrace::h8833a10924a5c2d2
  10:     0x7fbedf2c47ed - rust_begin_unwind
  11:     0x7fbedf352a40 - core::panicking::panic_fmt::h57d6d212ea0ce749
  12:     0x7fbeddea5575 - <rustc_errors[20cbecb65c2fd5d8]::diagnostic::Diag>::span_suggestion_with_style::<&str, alloc[7c2d8435141f8e1e]::string::String>
  13:     0x7fbeddba70ef - <rustc_trait_selection[9d3ba524c639591c]::error_reporting::TypeErrCtxt>::point_at_chain::<rustc_span[37f46e797e36bb53]::ErrorGuaranteed>
  14:     0x7fbeddba5f96 - <rustc_trait_selection[9d3ba524c639591c]::error_reporting::TypeErrCtxt>::note_function_argument_obligation::<rustc_span[37f46e797e36bb53]::ErrorGuaranteed>
  15:     0x7fbeddb9fa32 - <rustc_trait_selection[9d3ba524c639591c]::error_reporting::TypeErrCtxt>::note_obligation_cause_code::<rustc_span[37f46e797e36bb53]::ErrorGuaranteed, rustc_middle[e6c5fc1c8185df83]::ty::predicate::Predicate>
  16:     0x7fbeddb86125 - <rustc_trait_selection[9d3ba524c639591c]::error_reporting::TypeErrCtxt>::note_obligation_cause
  17:     0x7fbeddb7af45 - <rustc_trait_selection[9d3ba524c639591c]::error_reporting::TypeErrCtxt>::report_selection_error
  18:     0x7fbeddbc2394 - <rustc_trait_selection[9d3ba524c639591c]::error_reporting::TypeErrCtxt>::report_fulfillment_error
  19:     0x7fbeddbacb07 - <rustc_trait_selection[9d3ba524c639591c]::error_reporting::TypeErrCtxt>::report_fulfillment_errors
  20:     0x7fbedb244ff9 - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_argument_types
  21:     0x7fbedb244372 - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_method_argument_types
  22:     0x7fbedb2bb5eb - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_kind
  23:     0x7fbedb21ebdf - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  24:     0x7fbedb2afdc5 - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_with_expectation
  25:     0x7fbedb2b487f - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_kind
  26:     0x7fbedb21ebdf - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  27:     0x7fbedb2afdc5 - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_with_expectation
  28:     0x7fbedb251056 - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_block
  29:     0x7fbedb2b1982 - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_kind
  30:     0x7fbedb21ebdf - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  31:     0x7fbedb2afdc5 - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_with_expectation
  32:     0x7fbedb2b70e1 - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_kind
  33:     0x7fbedb21ebdf - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  34:     0x7fbedb2afdc5 - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_with_expectation
  35:     0x7fbedb250f2c - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_block
  36:     0x7fbedb2b502c - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_kind
  37:     0x7fbedb21ebdf - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  38:     0x7fbedb2afdc5 - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_with_expectation
  39:     0x7fbedb2b70e1 - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_kind
  40:     0x7fbedb21ebdf - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  41:     0x7fbedb2afdc5 - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_with_expectation
  42:     0x7fbedb2b0726 - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_kind
  43:     0x7fbedb21ebdf - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  44:     0x7fbedb2afdc5 - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_with_expectation
  45:     0x7fbedb250f2c - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_block
  46:     0x7fbedb2b1982 - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_kind
  47:     0x7fbedb21ebdf - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  48:     0x7fbedb2afdc5 - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_expr_with_expectation
  49:     0x7fbedb2201bf - <rustc_hir_typeck[c5136c63f534b988]::fn_ctxt::FnCtxt>::check_return_or_body_tail
  50:     0x7fbedb54b17b - rustc_hir_typeck[c5136c63f534b988]::check::check_fn
  51:     0x7fbedb543e2f - rustc_hir_typeck[c5136c63f534b988]::typeck
  52:     0x7fbedd347a35 - rustc_query_impl[bec2af351405b693]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[bec2af351405b693]::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e6c5fc1c8185df83]::query::erase::Erased<[u8; 8usize]>>
  53:     0x7fbedd2b7115 - <rustc_query_impl[bec2af351405b693]::query_impl::typeck::dynamic_query::{closure#2} as core[dcda4f281d996093]::ops::function::FnOnce<(rustc_middle[e6c5fc1c8185df83]::ty::context::TyCtxt, rustc_span[37f46e797e36bb53]::def_id::LocalDefId)>>::call_once
  54:     0x7fbedd214d34 - rustc_query_system[1b6cbf762e62559d]::query::plumbing::try_execute_query::<rustc_query_impl[bec2af351405b693]::DynamicConfig<rustc_data_structures[8c79ebd7d363ac43]::vec_cache::VecCache<rustc_span[37f46e797e36bb53]::def_id::LocalDefId, rustc_middle[e6c5fc1c8185df83]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[1b6cbf762e62559d]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[bec2af351405b693]::plumbing::QueryCtxt, false>
  55:     0x7fbedd4369fb - rustc_query_impl[bec2af351405b693]::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
  56:     0x7fbedb7a3e04 - <rustc_middle[e6c5fc1c8185df83]::hir::map::Map>::par_body_owners::<rustc_hir_analysis[beef3382d6061d7f]::check_crate::{closure#4}>::{closure#0}
  57:     0x7fbedb79355d - <rustc_data_structures[8c79ebd7d363ac43]::sync::parallel::ParallelGuard>::run::<(), rustc_data_structures[8c79ebd7d363ac43]::sync::parallel::par_for_each_in<&rustc_span[37f46e797e36bb53]::def_id::LocalDefId, &[rustc_span[37f46e797e36bb53]::def_id::LocalDefId], <rustc_middle[e6c5fc1c8185df83]::hir::map::Map>::par_body_owners<rustc_hir_analysis[beef3382d6061d7f]::check_crate::{closure#4}>::{closure#0}>::{closure#0}::{closure#1}::{closure#0}>
  58:     0x7fbedb80b8be - rustc_hir_analysis[beef3382d6061d7f]::check_crate
  59:     0x7fbedae4d3b1 - rustc_interface[3a875bb8a3a01a82]::passes::analysis
  60:     0x7fbedd348053 - rustc_query_impl[bec2af351405b693]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[bec2af351405b693]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e6c5fc1c8185df83]::query::erase::Erased<[u8; 1usize]>>
  61:     0x7fbedd2b7c41 - <rustc_query_impl[bec2af351405b693]::query_impl::analysis::dynamic_query::{closure#2} as core[dcda4f281d996093]::ops::function::FnOnce<(rustc_middle[e6c5fc1c8185df83]::ty::context::TyCtxt, ())>>::call_once
  62:     0x7fbedd1628fc - rustc_query_system[1b6cbf762e62559d]::query::plumbing::try_execute_query::<rustc_query_impl[bec2af351405b693]::DynamicConfig<rustc_query_system[1b6cbf762e62559d]::query::caches::SingleCache<rustc_middle[e6c5fc1c8185df83]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[bec2af351405b693]::plumbing::QueryCtxt, false>
  63:     0x7fbedd545338 - rustc_query_impl[bec2af351405b693]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  64:     0x7fbedab418bb - <rustc_middle[e6c5fc1c8185df83]::ty::context::GlobalCtxt>::enter::<rustc_driver_impl[d7b86d9e63f9aaed]::run_compiler::{closure#0}::{closure#1}::{closure#4}, core[dcda4f281d996093]::result::Result<core[dcda4f281d996093]::option::Option<rustc_interface[3a875bb8a3a01a82]::queries::Linker>, rustc_span[37f46e797e36bb53]::ErrorGuaranteed>>
  65:     0x7fbedaaf665a - <rustc_interface[3a875bb8a3a01a82]::queries::QueryResult<&rustc_middle[e6c5fc1c8185df83]::ty::context::GlobalCtxt>>::enter::<core[dcda4f281d996093]::result::Result<core[dcda4f281d996093]::option::Option<rustc_interface[3a875bb8a3a01a82]::queries::Linker>, rustc_span[37f46e797e36bb53]::ErrorGuaranteed>, rustc_driver_impl[d7b86d9e63f9aaed]::run_compiler::{closure#0}::{closure#1}::{closure#4}>
  66:     0x7fbedab0237c - <rustc_interface[3a875bb8a3a01a82]::interface::Compiler>::enter::<rustc_driver_impl[d7b86d9e63f9aaed]::run_compiler::{closure#0}::{closure#1}, core[dcda4f281d996093]::result::Result<core[dcda4f281d996093]::option::Option<rustc_interface[3a875bb8a3a01a82]::queries::Linker>, rustc_span[37f46e797e36bb53]::ErrorGuaranteed>>
  67:     0x7fbedab321de - <scoped_tls[46415f2badf08390]::ScopedKey<rustc_span[37f46e797e36bb53]::SessionGlobals>>::set::<rustc_interface[3a875bb8a3a01a82]::util::run_in_thread_with_globals<rustc_interface[3a875bb8a3a01a82]::util::run_in_thread_pool_with_globals<rustc_interface[3a875bb8a3a01a82]::interface::run_compiler<core[dcda4f281d996093]::result::Result<(), rustc_span[37f46e797e36bb53]::ErrorGuaranteed>, rustc_driver_impl[d7b86d9e63f9aaed]::run_compiler::{closure#0}>::{closure#1}, core[dcda4f281d996093]::result::Result<(), rustc_span[37f46e797e36bb53]::ErrorGuaranteed>>::{closure#0}, core[dcda4f281d996093]::result::Result<(), rustc_span[37f46e797e36bb53]::ErrorGuaranteed>>::{closure#0}::{closure#0}::{closure#0}, core[dcda4f281d996093]::result::Result<(), rustc_span[37f46e797e36bb53]::ErrorGuaranteed>>
  68:     0x7fbedaae44dc - rustc_span[37f46e797e36bb53]::create_session_globals_then::<core[dcda4f281d996093]::result::Result<(), rustc_span[37f46e797e36bb53]::ErrorGuaranteed>, rustc_interface[3a875bb8a3a01a82]::util::run_in_thread_with_globals<rustc_interface[3a875bb8a3a01a82]::util::run_in_thread_pool_with_globals<rustc_interface[3a875bb8a3a01a82]::interface::run_compiler<core[dcda4f281d996093]::result::Result<(), rustc_span[37f46e797e36bb53]::ErrorGuaranteed>, rustc_driver_impl[d7b86d9e63f9aaed]::run_compiler::{closure#0}>::{closure#1}, core[dcda4f281d996093]::result::Result<(), rustc_span[37f46e797e36bb53]::ErrorGuaranteed>>::{closure#0}, core[dcda4f281d996093]::result::Result<(), rustc_span[37f46e797e36bb53]::ErrorGuaranteed>>::{closure#0}::{closure#0}::{closure#0}>
  69:     0x7fbedab6f232 - std[31742bae037c253]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[3a875bb8a3a01a82]::util::run_in_thread_with_globals<rustc_interface[3a875bb8a3a01a82]::util::run_in_thread_pool_with_globals<rustc_interface[3a875bb8a3a01a82]::interface::run_compiler<core[dcda4f281d996093]::result::Result<(), rustc_span[37f46e797e36bb53]::ErrorGuaranteed>, rustc_driver_impl[d7b86d9e63f9aaed]::run_compiler::{closure#0}>::{closure#1}, core[dcda4f281d996093]::result::Result<(), rustc_span[37f46e797e36bb53]::ErrorGuaranteed>>::{closure#0}, core[dcda4f281d996093]::result::Result<(), rustc_span[37f46e797e36bb53]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[dcda4f281d996093]::result::Result<(), rustc_span[37f46e797e36bb53]::ErrorGuaranteed>>
  70:     0x7fbedaaf0574 - <<std[31742bae037c253]::thread::Builder>::spawn_unchecked_<rustc_interface[3a875bb8a3a01a82]::util::run_in_thread_with_globals<rustc_interface[3a875bb8a3a01a82]::util::run_in_thread_pool_with_globals<rustc_interface[3a875bb8a3a01a82]::interface::run_compiler<core[dcda4f281d996093]::result::Result<(), rustc_span[37f46e797e36bb53]::ErrorGuaranteed>, rustc_driver_impl[d7b86d9e63f9aaed]::run_compiler::{closure#0}>::{closure#1}, core[dcda4f281d996093]::result::Result<(), rustc_span[37f46e797e36bb53]::ErrorGuaranteed>>::{closure#0}, core[dcda4f281d996093]::result::Result<(), rustc_span[37f46e797e36bb53]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[dcda4f281d996093]::result::Result<(), rustc_span[37f46e797e36bb53]::ErrorGuaranteed>>::{closure#1} as core[dcda4f281d996093]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  71:     0x7fbedf30319d - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hc538cfe9cf5a97c8
  72:     0x7fbedf2923ab - std::sys::pal::unix::thread::Thread::new::thread_start::h7a196e16c036c2e2
  73:     0x7fbed8a3eac3 - start_thread
                               at ./nptl/pthread_create.c:442:8
  74:     0x7fbed8ad0850 - __GI___clone3
                               at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
  75:                0x0 - <unknown>

[jieyouxu]

@wxie7 with these fuzzed examples, can you try to trim out the unused dependencies? E.g. in this case this example imports use rand::{thread_rng, Rng}; but it's not actually used, and I can repro the ICE without that. The external deps make it more annoying when it's unrelated errors.

[jieyouxu]

Minimized:

fn main() {
    String::new()
        .chars()
        .map(|x| {
            println!("{}", x);
        })
        .collect::<String>();
}