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ICE: `expected const for .. but found Type(usize) when instantiating args=[usize] ` #121429

Open matthiaskrgr opened 9 months ago

matthiaskrgr commented 9 months ago

snippet:

#![feature(generic_const_exprs)]

pub trait True {}

impl<const N: usize = { const { 3 } }> PartialEq<FixedI8<FRAC_RHS>> for FixedI8<FRAC_LHS> where
    If<{}>: True
{
}

Version information

rustc 1.78.0-nightly (f8131a48a 2024-02-21)
binary: rustc
commit-hash: f8131a48a46ac3bc8a3d0fe0477055b132cffdc3
commit-date: 2024-02-21
host: x86_64-unknown-linux-gnu
release: 1.78.0-nightly
LLVM version: 18.1.0

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

Program output

``` error[E0412]: cannot find type `FixedI8` in this scope --> /tmp/icemaker_global_tempdir.YLWanMEPxk5w/rustc_testrunner_tmpdir_reporting.GqWIEqxOTkdO/mvce.rs:5:50 | 5 | impl PartialEq> for FixedI8 where | ^^^^^^^ not found in this scope error[E0412]: cannot find type `FRAC_RHS` in this scope --> /tmp/icemaker_global_tempdir.YLWanMEPxk5w/rustc_testrunner_tmpdir_reporting.GqWIEqxOTkdO/mvce.rs:5:58 | 5 | impl PartialEq> for FixedI8 where | ^^^^^^^^ not found in this scope | help: you might be missing a type parameter | 5 | impl PartialEq> for FixedI8 where | ++++++++++ error[E0412]: cannot find type `FixedI8` in this scope --> /tmp/icemaker_global_tempdir.YLWanMEPxk5w/rustc_testrunner_tmpdir_reporting.GqWIEqxOTkdO/mvce.rs:5:73 | 5 | impl PartialEq> for FixedI8 where | ^^^^^^^ not found in this scope error[E0412]: cannot find type `FRAC_LHS` in this scope --> /tmp/icemaker_global_tempdir.YLWanMEPxk5w/rustc_testrunner_tmpdir_reporting.GqWIEqxOTkdO/mvce.rs:5:81 | 5 | impl PartialEq> for FixedI8 where | ^^^^^^^^ not found in this scope | help: you might be missing a type parameter | 5 | impl PartialEq> for FixedI8 where | ++++++++++ error[E0412]: cannot find type `If` in this scope --> /tmp/icemaker_global_tempdir.YLWanMEPxk5w/rustc_testrunner_tmpdir_reporting.GqWIEqxOTkdO/mvce.rs:6:5 | 6 | If<{}>: True | ^^ not found in this scope error[E0658]: inline-const is experimental --> /tmp/icemaker_global_tempdir.YLWanMEPxk5w/rustc_testrunner_tmpdir_reporting.GqWIEqxOTkdO/mvce.rs:5:25 | 5 | impl PartialEq> for FixedI8 where | ^^^^^ | = note: see issue #76001 for more information = help: add `#![feature(inline_const)]` to the crate attributes to enable = note: this compiler was built on 2024-02-21; consider upgrading it if it is out of date warning: the feature `generic_const_exprs` is incomplete and may not be safe to use and/or cause compiler crashes --> /tmp/icemaker_global_tempdir.YLWanMEPxk5w/rustc_testrunner_tmpdir_reporting.GqWIEqxOTkdO/mvce.rs:1:12 | 1 | #![feature(generic_const_exprs)] | ^^^^^^^^^^^^^^^^^^^ | = note: see issue #76560 for more information = note: `#[warn(incomplete_features)]` on by default error[E0601]: `main` function not found in crate `mvce` --> /tmp/icemaker_global_tempdir.YLWanMEPxk5w/rustc_testrunner_tmpdir_reporting.GqWIEqxOTkdO/mvce.rs:8:2 | 8 | } | ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.YLWanMEPxk5w/rustc_testrunner_tmpdir_reporting.GqWIEqxOTkdO/mvce.rs` error: defaults for const parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions --> /tmp/icemaker_global_tempdir.YLWanMEPxk5w/rustc_testrunner_tmpdir_reporting.GqWIEqxOTkdO/mvce.rs:5:6 | 5 | impl PartialEq> for FixedI8 where | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: internal compiler error: compiler/rustc_middle/src/ty/generic_args.rs:956:9: expected const for `N/#0` (N/#0: usize/0) but found Type(usize) when instantiating args=[usize] thread 'rustc' panicked at compiler/rustc_middle/src/util/bug.rs:35:44: Box stack backtrace: 0: 0x7ffa6ad8caf6 - std::backtrace_rs::backtrace::libunwind::trace::hbec2edc838b433e2 at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5 1: 0x7ffa6ad8caf6 - std::backtrace_rs::backtrace::trace_unsynchronized::h88c30257ee0dd166 at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 2: 0x7ffa6ad8caf6 - std::sys_common::backtrace::_print_fmt::h9176654d509e3088 at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/sys_common/backtrace.rs:68:5 3: 0x7ffa6ad8caf6 - ::fmt::h671feaee1776bf19 at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/sys_common/backtrace.rs:44:22 4: 0x7ffa6addda7c - core::fmt::rt::Argument::fmt::h59605c83ae32d935 at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/core/src/fmt/rt.rs:142:9 5: 0x7ffa6addda7c - core::fmt::write::hf7af8dfcfd20db5b at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/core/src/fmt/mod.rs:1120:17 6: 0x7ffa6ad814bf - std::io::Write::write_fmt::h92a5dbf489025e71 at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/io/mod.rs:1846:15 7: 0x7ffa6ad8c8a4 - std::sys_common::backtrace::_print::h00080302d23998ae at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/sys_common/backtrace.rs:47:5 8: 0x7ffa6ad8c8a4 - std::sys_common::backtrace::print::h6b23124445400245 at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/sys_common/backtrace.rs:34:9 9: 0x7ffa6ad8f5eb - std::panicking::default_hook::{{closure}}::hd67b2f9d36675a28 10: 0x7ffa6ad8f339 - std::panicking::default_hook::h10a39ef11c714e42 at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/panicking.rs:292:9 11: 0x7ffa6dc7a94c - std[5a8e7f94216a9138]::panicking::update_hook::>::{closure#0} 12: 0x7ffa6ad8fd50 - as core::ops::function::Fn>::call::h37ba37dc48823c1d at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/alloc/src/boxed.rs:2030:9 13: 0x7ffa6ad8fd50 - std::panicking::rust_panic_with_hook::he3e3bc7c345bf54b at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/panicking.rs:786:13 14: 0x7ffa6dca7524 - std[5a8e7f94216a9138]::panicking::begin_panic::::{closure#0} 15: 0x7ffa6dca4176 - std[5a8e7f94216a9138]::sys_common::backtrace::__rust_end_short_backtrace::::{closure#0}, !> 16: 0x7ffa6dc9f936 - std[5a8e7f94216a9138]::panicking::begin_panic:: 17: 0x7ffa6c617631 - ::emit_producing_guarantee 18: 0x7ffa6e08300c - ::bug:: 19: 0x7ffa6e127c7b - rustc_middle[446dd094ad85939e]::util::bug::opt_span_bug_fmt::::{closure#0} 20: 0x7ffa6e10bc3a - rustc_middle[446dd094ad85939e]::ty::context::tls::with_opt::::{closure#0}, !>::{closure#0} 21: 0x7ffa6e10bab8 - rustc_middle[446dd094ad85939e]::ty::context::tls::with_context_opt::::{closure#0}, !>::{closure#0}, !> 22: 0x7ffa6c599af0 - rustc_middle[446dd094ad85939e]::util::bug::bug_fmt 23: 0x7ffa6e11bba2 - ::const_param_expected 24: 0x7ffa6f038649 - >::fold_const 25: 0x7ffa6f37139d - <&rustc_middle[446dd094ad85939e]::ty::list::List as rustc_type_ir[2405427f08dfadb1]::fold::TypeFoldable>::try_fold_with:: 26: 0x7ffa6f038541 - >::fold_const 27: 0x7ffa6f037fc8 - >::try_fold_with:: 28: 0x7ffa6f035d60 - ::instantiate_into 29: 0x7ffa6f035ff5 - ::instantiate_into 30: 0x7ffa6f6aa74f - rustc_trait_selection[f311605eeacf2c8d]::traits::query::type_op::ascribe_user_type::type_op_ascribe_user_type_with_span 31: 0x7ffa6f14fa91 - rustc_traits[e4f791f45ab3a736]::type_op::type_op_ascribe_user_type 32: 0x7ffa6f14f42e - rustc_query_impl[9d4c51777e2bb749]::plumbing::__rust_begin_short_backtrace::> 33: 0x7ffa6f14f3f7 - >)>>::call_once 34: 0x7ffa6f9d0499 - rustc_query_system[9b2ccfe41ae3bb1b]::query::plumbing::try_execute_query::>, rustc_middle[446dd094ad85939e]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[9d4c51777e2bb749]::plumbing::QueryCtxt, false> 35: 0x7ffa6f9d01ae - rustc_query_impl[9d4c51777e2bb749]::query_impl::type_op_ascribe_user_type::get_query_non_incr::__rust_end_short_backtrace 36: 0x7ffa6f9cff2d - ::perform_query 37: 0x7ffa6fe65ce4 - ::ascribe_user_type 38: 0x7ffa6f5571b7 - ::visit_operand 39: 0x7ffa6cd3809f - ::visit_body 40: 0x7ffa6ccf2ae0 - rustc_borrowck[bb9d4175d74ce943]::type_check::type_check 41: 0x7ffa6ccd96bc - rustc_borrowck[bb9d4175d74ce943]::nll::compute_regions 42: 0x7ffa6fded246 - rustc_borrowck[bb9d4175d74ce943]::do_mir_borrowck 43: 0x7ffa6fddfb40 - rustc_borrowck[bb9d4175d74ce943]::mir_borrowck 44: 0x7ffa6fddf5d7 - rustc_query_impl[9d4c51777e2bb749]::plumbing::__rust_begin_short_backtrace::> 45: 0x7ffa6f1098b0 - rustc_query_system[9b2ccfe41ae3bb1b]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[9d4c51777e2bb749]::plumbing::QueryCtxt, false> 46: 0x7ffa6f10948c - rustc_query_impl[9d4c51777e2bb749]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace 47: 0x7ffa6faa2f30 - rustc_interface[7ca501d7f8f3a34f]::passes::analysis 48: 0x7ffa6faa2a29 - rustc_query_impl[9d4c51777e2bb749]::plumbing::__rust_begin_short_backtrace::> 49: 0x7ffa6fd3d4a5 - rustc_query_system[9b2ccfe41ae3bb1b]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[9d4c51777e2bb749]::plumbing::QueryCtxt, false> 50: 0x7ffa6fd3d209 - rustc_query_impl[9d4c51777e2bb749]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace 51: 0x7ffa6fd4c719 - rustc_interface[7ca501d7f8f3a34f]::interface::run_compiler::, rustc_driver_impl[e279e4f1fedd9109]::run_compiler::{closure#0}>::{closure#0} 52: 0x7ffa6ffbe705 - std[5a8e7f94216a9138]::sys_common::backtrace::__rust_begin_short_backtrace::, rustc_driver_impl[e279e4f1fedd9109]::run_compiler::{closure#0}>::{closure#0}, core[85b4fd477ce5bb21]::result::Result<(), rustc_span[adb133ac03280fc1]::ErrorGuaranteed>>::{closure#0}, core[85b4fd477ce5bb21]::result::Result<(), rustc_span[adb133ac03280fc1]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[85b4fd477ce5bb21]::result::Result<(), rustc_span[adb133ac03280fc1]::ErrorGuaranteed>> 53: 0x7ffa6ffbe532 - <::spawn_unchecked_, rustc_driver_impl[e279e4f1fedd9109]::run_compiler::{closure#0}>::{closure#0}, core[85b4fd477ce5bb21]::result::Result<(), rustc_span[adb133ac03280fc1]::ErrorGuaranteed>>::{closure#0}, core[85b4fd477ce5bb21]::result::Result<(), rustc_span[adb133ac03280fc1]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[85b4fd477ce5bb21]::result::Result<(), rustc_span[adb133ac03280fc1]::ErrorGuaranteed>>::{closure#1} as core[85b4fd477ce5bb21]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 54: 0x7ffa6ad99725 - as core::ops::function::FnOnce>::call_once::h1bff3efb61c3fa6b at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/alloc/src/boxed.rs:2016:9 55: 0x7ffa6ad99725 - as core::ops::function::FnOnce>::call_once::h83141cf549dced8a at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/alloc/src/boxed.rs:2016:9 56: 0x7ffa6ad99725 - std::sys::pal::unix::thread::Thread::new::thread_start::hbe9287fdd7c325bc at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/sys/pal/unix/thread.rs:108:17 57: 0x7ffa6ab819eb - 58: 0x7ffa6ac057cc - 59: 0x0 - 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: rustc 1.78.0-nightly (f8131a48a 2024-02-21) running on x86_64-unknown-linux-gnu query stack during panic: #0 [type_op_ascribe_user_type] evaluating `type_op_ascribe_user_type` `AscribeUserType { mir_ty: usize, user_ty: TypeOf(DefId(0:7 ~ mvce[8c01]::{impl#0}::{constant#0}::{constant#0}), UserArgs { args: [usize], user_self_ty: None }) }` #1 [mir_borrowck] borrow-checking `::{constant#0}` #2 [analysis] running analysis passes on this crate end of query stack error: aborting due to 9 previous errors; 1 warning emitted Some errors have detailed explanations: E0412, E0601, E0658. For more information about an error, try `rustc --explain E0412`. ```

matthiaskrgr commented 9 months ago

120847 cc @oli-obk

camelid commented 2 days ago

After #133610, this particular code no longer crashes, but adding definitions causes it to start crashing again:

//@ known-bug: #121429

#![feature(generic_const_exprs)]

struct FixedI8<const X: usize>;
const FRAC_LHS: usize = 0;
const FRAC_RHS: usize = 1;

pub trait True {}

impl<const N: usize = { const { 3 } }> PartialEq<FixedI8<FRAC_RHS>> for FixedI8<FRAC_LHS> where
    If<{}>: True
{
}