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ICE: `Size != Size` #127219

Closed matthiaskrgr closed 21 hours ago

matthiaskrgr commented 3 days ago

snippet:

const FOO: &str = unsafe { &*(1_usize as *const [i64; 0] as *const [u8] as *const str) };

Version information

rustc 1.81.0-nightly (221e2741c 2024-07-01)
binary: rustc
commit-hash: 221e2741c39515a5de6da42d8c76ee1e132c2c74
commit-date: 2024-07-01
host: x86_64-unknown-linux-gnu
release: 1.81.0-nightly
LLVM version: 18.1.7

Command: /home/matthias/.rustup/toolchains/master/bin/rustc

Program output

``` error[E0601]: `main` function not found in crate `mvce` --> /tmp/icemaker_global_tempdir.tY2IsWZigJvc/rustc_testrunner_tmpdir_reporting.t3rMboN5RF2v/mvce.rs:1:90 | 1 | const FOO: &str = unsafe { &*(1_usize as *const [i64; 0] as *const [u8] as *const str) }; | ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.tY2IsWZigJvc/rustc_testrunner_tmpdir_reporting.t3rMboN5RF2v/mvce.rs` error[E0607]: cannot cast thin pointer `*const [i64; 0]` to fat pointer `*const [u8]` --> /tmp/icemaker_global_tempdir.tY2IsWZigJvc/rustc_testrunner_tmpdir_reporting.t3rMboN5RF2v/mvce.rs:1:31 | 1 | const FOO: &str = unsafe { &*(1_usize as *const [i64; 0] as *const [u8] as *const str) }; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ thread 'rustc' panicked at compiler/rustc_const_eval/src/interpret/cast.rs:212:13: assertion `left == right` failed left: Size(8 bytes) right: Size(16 bytes) stack backtrace: 0: 0x7442b00f13d5 - std::backtrace_rs::backtrace::libunwind::trace::hb712d1033083f19f at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5 1: 0x7442b00f13d5 - std::backtrace_rs::backtrace::trace_unsynchronized::hcd45231d964c5f87 at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 2: 0x7442b00f13d5 - std::sys::backtrace::_print_fmt::ha326387fd7186899 at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/std/src/sys/backtrace.rs:68:5 3: 0x7442b00f13d5 - ::fmt::hb0a71f126ecc5f94 at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/std/src/sys/backtrace.rs:44:22 4: 0x7442b0140adb - core::fmt::rt::Argument::fmt::hcb80cd58ae514c57 at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/core/src/fmt/rt.rs:173:76 5: 0x7442b0140adb - core::fmt::write::h24e86a79a1d9fd27 at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/core/src/fmt/mod.rs:1174:21 6: 0x7442b00e5f7f - std::io::Write::write_fmt::h6f24f5499b917dd0 at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/std/src/io/mod.rs:1835:15 7: 0x7442b00f11ae - std::sys::backtrace::_print::hab3688cd990b4da1 at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/std/src/sys/backtrace.rs:47:5 8: 0x7442b00f11ae - std::sys::backtrace::print::hd7ca970b8f6f0d2a at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/std/src/sys/backtrace.rs:34:9 9: 0x7442b00f3af9 - std::panicking::default_hook::{{closure}}::hbcefa19962d38670 10: 0x7442b00f389c - std::panicking::default_hook::ha30d3ad58a1508fe at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/std/src/panicking.rs:292:9 11: 0x7442ac5f21d9 - std[a32dded7438b921f]::panicking::update_hook::>::{closure#0} 12: 0x7442b00f441f - as core::ops::function::Fn>::call::h62bf5bbfe5d978e7 at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/alloc/src/boxed.rs:2078:9 13: 0x7442b00f441f - std::panicking::rust_panic_with_hook::h27b2c56b49aaf9e9 at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/std/src/panicking.rs:804:13 14: 0x7442b00f4047 - std::panicking::begin_panic_handler::{{closure}}::h5289f8126ff30957 at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/std/src/panicking.rs:670:13 15: 0x7442b00f1899 - std::sys::backtrace::__rust_end_short_backtrace::h21cd56c9f55744b2 at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/std/src/sys/backtrace.rs:171:18 16: 0x7442b00f3cd4 - rust_begin_unwind at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/std/src/panicking.rs:661:5 17: 0x7442b013d093 - core::panicking::panic_fmt::h37d5e7cdc93b0dc7 at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/core/src/panicking.rs:74:14 18: 0x7442b013d59e - core::panicking::assert_failed_inner::h6c69218920a45b99 at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/core/src/panicking.rs:410:17 19: 0x7442ac55ccf3 - core[a1d5b26218b7595a]::panicking::assert_failed:: 20: 0x7442ae860466 - >::eval_rvalue_into_place 21: 0x7442ae7c1dcc - rustc_const_eval[5026d74ad8aa4e4c]::const_eval::eval_queries::eval_to_allocation_raw_provider 22: 0x7442ae7c11b6 - rustc_query_impl[823e173f31dca1d9]::plumbing::__rust_begin_short_backtrace::> 23: 0x7442ae7baf91 - rustc_query_system[837d787005d5746e]::query::plumbing::try_execute_query::, rustc_middle[9e476e531f4cdc39]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[823e173f31dca1d9]::plumbing::QueryCtxt, false> 24: 0x7442ae7bab70 - rustc_query_impl[823e173f31dca1d9]::query_impl::eval_to_allocation_raw::get_query_non_incr::__rust_end_short_backtrace 25: 0x7442ae7bcdde - rustc_const_eval[5026d74ad8aa4e4c]::const_eval::eval_queries::eval_to_const_value_raw_provider 26: 0x7442ae7bcbf6 - rustc_query_impl[823e173f31dca1d9]::plumbing::__rust_begin_short_backtrace::> 27: 0x7442ae7baf54 - rustc_query_system[837d787005d5746e]::query::plumbing::try_execute_query::, rustc_middle[9e476e531f4cdc39]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[823e173f31dca1d9]::plumbing::QueryCtxt, false> 28: 0x7442ae7baa70 - rustc_query_impl[823e173f31dca1d9]::query_impl::eval_to_const_value_raw::get_query_non_incr::__rust_end_short_backtrace 29: 0x7442adeffdf6 - ::par_body_owners::::{closure#0} 30: 0x7442adefd594 - rustc_hir_analysis[131fe9ac51ca670c]::check_crate 31: 0x7442adef3215 - rustc_interface[b2c362fcb0f0a28c]::passes::analysis 32: 0x7442adef2ddb - rustc_query_impl[823e173f31dca1d9]::plumbing::__rust_begin_short_backtrace::> 33: 0x7442aeadcce5 - rustc_query_system[837d787005d5746e]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[823e173f31dca1d9]::plumbing::QueryCtxt, false> 34: 0x7442aeadca4f - rustc_query_impl[823e173f31dca1d9]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace 35: 0x7442aea1c407 - rustc_interface[b2c362fcb0f0a28c]::interface::run_compiler::, rustc_driver_impl[caf9fb610f137d76]::run_compiler::{closure#0}>::{closure#1} 36: 0x7442ae99c689 - std[a32dded7438b921f]::sys::backtrace::__rust_begin_short_backtrace::, rustc_driver_impl[caf9fb610f137d76]::run_compiler::{closure#0}>::{closure#1}, core[a1d5b26218b7595a]::result::Result<(), rustc_span[5b114e5127e2dfa0]::ErrorGuaranteed>>::{closure#0}, core[a1d5b26218b7595a]::result::Result<(), rustc_span[5b114e5127e2dfa0]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[a1d5b26218b7595a]::result::Result<(), rustc_span[5b114e5127e2dfa0]::ErrorGuaranteed>> 37: 0x7442ae99c43a - <::spawn_unchecked_, rustc_driver_impl[caf9fb610f137d76]::run_compiler::{closure#0}>::{closure#1}, core[a1d5b26218b7595a]::result::Result<(), rustc_span[5b114e5127e2dfa0]::ErrorGuaranteed>>::{closure#0}, core[a1d5b26218b7595a]::result::Result<(), rustc_span[5b114e5127e2dfa0]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[a1d5b26218b7595a]::result::Result<(), rustc_span[5b114e5127e2dfa0]::ErrorGuaranteed>>::{closure#2} as core[a1d5b26218b7595a]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 38: 0x7442b00fe27b - as core::ops::function::FnOnce>::call_once::h8a74f28960a176f3 at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/alloc/src/boxed.rs:2064:9 39: 0x7442b00fe27b - as core::ops::function::FnOnce>::call_once::h3f01a028499c33ae at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/alloc/src/boxed.rs:2064:9 40: 0x7442b00fe27b - std::sys::pal::unix::thread::Thread::new::thread_start::h256c3a78891e662c at /rustc/221e2741c39515a5de6da42d8c76ee1e132c2c74/library/std/src/sys/pal/unix/thread.rs:108:17 41: 0x7442a90a6ded - 42: 0x7442a912a0dc - 43: 0x0 - 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: rustc 1.81.0-nightly (221e2741c 2024-07-01) running on x86_64-unknown-linux-gnu query stack during panic: #0 [eval_to_allocation_raw] const-evaluating + checking `FOO` #1 [eval_to_const_value_raw] simplifying constant for the type system `FOO` end of query stack error: aborting due to 2 previous errors Some errors have detailed explanations: E0601, E0607. For more information about an error, try `rustc --explain E0601`. ```

matthiaskrgr commented 3 days ago

This ICEs since #126996 cc @oli-obk