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ICE: `failed region resolution while normalizing ParamEnv ` #121414

Closed matthiaskrgr closed 7 months ago

matthiaskrgr commented 7 months ago

auto-reduced (treereduce-rust):

trait Bar {
    type Type;
}
struct Foo<'a>(&'a ());
impl<'a> Bar for Foo<'f> {}

fn test()
where
    for<'a> <Foo<'a> as Bar>::Type: Sized,
{
}

original:

//@ check-pass

trait Bar {
    type Type;
}
struct Foo<'a>(&'a ());
impl<'a> Bar for Foo<'f> {
    type Type = ();
}

fn func<'a>(_: <Foo<'a> as Bar>::Type) {}
fn assert_is_func<A>(_: fn(A)) {}

fn test()
where
    for<'a> <Foo<'a> as Bar>::Type: Sized,
{
    wrapper(func);
}

fn main() {}

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[E0261]: use of undeclared lifetime name `'f` --> /tmp/icemaker_global_tempdir.Qz3b41LbdD6V/rustc_testrunner_tmpdir_reporting.lrX8blRIpTCX/mvce.rs:5:22 | 5 | impl<'a> Bar for Foo<'f> {} | - ^^ undeclared lifetime | | | help: consider introducing lifetime `'f` here: `'f,` error[E0601]: `main` function not found in crate `mvce` --> /tmp/icemaker_global_tempdir.Qz3b41LbdD6V/rustc_testrunner_tmpdir_reporting.lrX8blRIpTCX/mvce.rs:11:2 | 11 | } | ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.Qz3b41LbdD6V/rustc_testrunner_tmpdir_reporting.lrX8blRIpTCX/mvce.rs` error[E0046]: not all trait items implemented, missing: `Type` --> /tmp/icemaker_global_tempdir.Qz3b41LbdD6V/rustc_testrunner_tmpdir_reporting.lrX8blRIpTCX/mvce.rs:5:1 | 2 | type Type; | --------- `Type` from trait ... 5 | impl<'a> Bar for Foo<'f> {} | ^^^^^^^^^^^^^^^^^^^^^^^^ missing `Type` in implementation error: internal compiler error: failed region resolution while normalizing ParamEnv { caller_bounds: [Binder { value: TraitPredicate(< as Bar>::Type as std::marker::Sized>, polarity:Positive), bound_vars: [Region(BrNamed(DefId(0:12 ~ mvce[8c01]::test::'a), 'a))] }], reveal: UserFacing }: [ConcreteFailure(Subtype(TypeTrace { cause: ObligationCause { span: /tmp/icemaker_global_tempdir.Qz3b41LbdD6V/rustc_testrunner_tmpdir_reporting.lrX8blRIpTCX/mvce.rs:7:1: 9:43 (#0), body_id: DefId(0:11 ~ mvce[8c01]::test), code: MatchImpl(ObligationCause { span: /tmp/icemaker_global_tempdir.Qz3b41LbdD6V/rustc_testrunner_tmpdir_reporting.lrX8blRIpTCX/mvce.rs:7:1: 9:43 (#0), body_id: DefId(0:11 ~ mvce[8c01]::test), code: MiscObligation }, DefId(0:9 ~ mvce[8c01]::{impl#0})) }, values: PolyTraitRefs(ExpectedFound { expected: Binder { value: as Bar>, bound_vars: [] }, found: Binder { value: as Bar>, bound_vars: [] } }) }), ReError, RePlaceholder(!1_BoundRegion { var: 0, kind: BrNamed(DefId(0:12 ~ mvce[8c01]::test::'a), 'a) }))] --> /tmp/icemaker_global_tempdir.Qz3b41LbdD6V/rustc_testrunner_tmpdir_reporting.lrX8blRIpTCX/mvce.rs:7:1 | 7 | / fn test() 8 | | where 9 | | for<'a> as Bar>::Type: Sized, | |__________________________________________^ thread 'rustc' panicked at compiler/rustc_trait_selection/src/traits/mod.rs:177:19: Box stack backtrace: 0: 0x7f6d36226af6 - std::backtrace_rs::backtrace::libunwind::trace::hbec2edc838b433e2 at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5 1: 0x7f6d36226af6 - std::backtrace_rs::backtrace::trace_unsynchronized::h88c30257ee0dd166 at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 2: 0x7f6d36226af6 - std::sys_common::backtrace::_print_fmt::h9176654d509e3088 at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/sys_common/backtrace.rs:68:5 3: 0x7f6d36226af6 - ::fmt::h671feaee1776bf19 at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/sys_common/backtrace.rs:44:22 4: 0x7f6d36277a7c - core::fmt::rt::Argument::fmt::h59605c83ae32d935 at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/core/src/fmt/rt.rs:142:9 5: 0x7f6d36277a7c - core::fmt::write::hf7af8dfcfd20db5b at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/core/src/fmt/mod.rs:1120:17 6: 0x7f6d3621b4bf - std::io::Write::write_fmt::h92a5dbf489025e71 at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/io/mod.rs:1846:15 7: 0x7f6d362268a4 - std::sys_common::backtrace::_print::h00080302d23998ae at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/sys_common/backtrace.rs:47:5 8: 0x7f6d362268a4 - std::sys_common::backtrace::print::h6b23124445400245 at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/sys_common/backtrace.rs:34:9 9: 0x7f6d362295eb - std::panicking::default_hook::{{closure}}::hd67b2f9d36675a28 10: 0x7f6d36229339 - std::panicking::default_hook::h10a39ef11c714e42 at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/panicking.rs:292:9 11: 0x7f6d32e7a94c - std[5a8e7f94216a9138]::panicking::update_hook::>::{closure#0} 12: 0x7f6d36229d50 - as core::ops::function::Fn>::call::h37ba37dc48823c1d at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/alloc/src/boxed.rs:2030:9 13: 0x7f6d36229d50 - std::panicking::rust_panic_with_hook::he3e3bc7c345bf54b at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/panicking.rs:786:13 14: 0x7f6d32ea7524 - std[5a8e7f94216a9138]::panicking::begin_panic::::{closure#0} 15: 0x7f6d32ea4176 - std[5a8e7f94216a9138]::sys_common::backtrace::__rust_end_short_backtrace::::{closure#0}, !> 16: 0x7f6d32e9f936 - std[5a8e7f94216a9138]::panicking::begin_panic:: 17: 0x7f6d31817631 - ::emit_producing_guarantee 18: 0x7f6d31e00316 - rustc_trait_selection[f311605eeacf2c8d]::traits::do_normalize_predicates 19: 0x7f6d31ded59e - rustc_trait_selection[f311605eeacf2c8d]::traits::normalize_param_env_or_error 20: 0x7f6d34550a80 - rustc_ty_utils[d35b0e036186ec50]::ty::param_env 21: 0x7f6d345506f9 - rustc_query_impl[9d4c51777e2bb749]::plumbing::__rust_begin_short_backtrace::> 22: 0x7f6d34274da1 - rustc_query_system[9b2ccfe41ae3bb1b]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[9d4c51777e2bb749]::plumbing::QueryCtxt, false> 23: 0x7f6d342747e1 - rustc_query_impl[9d4c51777e2bb749]::query_impl::param_env::get_query_non_incr::__rust_end_short_backtrace 24: 0x7f6d344262dc - rustc_middle[446dd094ad85939e]::query::plumbing::query_get_at::>> 25: 0x7f6d34350d3c - rustc_hir_analysis[71d4294717f7f2b7]::check::wfcheck::check_item_fn 26: 0x7f6d348fce30 - rustc_hir_analysis[71d4294717f7f2b7]::check::wfcheck::check_well_formed 27: 0x7f6d348fbd1d - rustc_query_impl[9d4c51777e2bb749]::plumbing::__rust_begin_short_backtrace::> 28: 0x7f6d348fb3ff - rustc_query_system[9b2ccfe41ae3bb1b]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[9d4c51777e2bb749]::plumbing::QueryCtxt, false> 29: 0x7f6d348fb17f - rustc_query_impl[9d4c51777e2bb749]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace 30: 0x7f6d348f9041 - rustc_hir_analysis[71d4294717f7f2b7]::check::wfcheck::check_mod_type_wf 31: 0x7f6d348f8f89 - rustc_query_impl[9d4c51777e2bb749]::plumbing::__rust_begin_short_backtrace::> 32: 0x7f6d34bac270 - rustc_query_system[9b2ccfe41ae3bb1b]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[9d4c51777e2bb749]::plumbing::QueryCtxt, false> 33: 0x7f6d34babf7f - rustc_query_impl[9d4c51777e2bb749]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace 34: 0x7f6d34bad2bc - rustc_middle[446dd094ad85939e]::query::plumbing::query_ensure_error_guaranteed::>, ()> 35: 0x7f6d34badaf1 - rustc_hir_analysis[71d4294717f7f2b7]::check_crate 36: 0x7f6d34ca2dd3 - rustc_interface[7ca501d7f8f3a34f]::passes::analysis 37: 0x7f6d34ca2a29 - rustc_query_impl[9d4c51777e2bb749]::plumbing::__rust_begin_short_backtrace::> 38: 0x7f6d34f3d4a5 - rustc_query_system[9b2ccfe41ae3bb1b]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[9d4c51777e2bb749]::plumbing::QueryCtxt, false> 39: 0x7f6d34f3d209 - rustc_query_impl[9d4c51777e2bb749]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace 40: 0x7f6d34f4c719 - rustc_interface[7ca501d7f8f3a34f]::interface::run_compiler::, rustc_driver_impl[e279e4f1fedd9109]::run_compiler::{closure#0}>::{closure#0} 41: 0x7f6d351be705 - 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>> 42: 0x7f6d351be532 - <::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} 43: 0x7f6d36233725 - as core::ops::function::FnOnce>::call_once::h1bff3efb61c3fa6b at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/alloc/src/boxed.rs:2016:9 44: 0x7f6d36233725 - as core::ops::function::FnOnce>::call_once::h83141cf549dced8a at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/alloc/src/boxed.rs:2016:9 45: 0x7f6d36233725 - std::sys::pal::unix::thread::Thread::new::thread_start::hbe9287fdd7c325bc at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/sys/pal/unix/thread.rs:108:17 46: 0x7f6d2feaa9eb - 47: 0x7f6d2ff2e7cc - 48: 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 [param_env] computing normalized predicates of `test` #1 [check_well_formed] checking that `test` is well-formed #2 [check_mod_type_wf] checking that types are well-formed in top-level module #3 [analysis] running analysis passes on this crate end of query stack error: aborting due to 4 previous errors Some errors have detailed explanations: E0046, E0261, E0601. For more information about an error, try `rustc --explain E0046`. ```

matthiaskrgr commented 7 months ago

Another one of #121208 cc @nnethercote