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ICE: unimpl selecting .. during codegen with -Zmir-opt-level=3 #95640
Description
Code
./src/test/ui/impl-trait/projection.rs or ./src/test/ui/impl-trait/issues/issue-93788.rs
struct D;
trait Tr {
type It;
fn foo(self) -> Option<Self::It>;
}
impl<'a> Tr for &'a D {
type It = ();
fn foo(self) -> Option<()> { None }
}
fn run<F>(f: F)
where for<'a> &'a D: Tr,
F: Fn(<&D as Tr>::It),
{
let d = &D;
while let Some(i) = d.foo() {
f(i);
}
}
fn main() {
run(|_| {});
}Meta
rustc --version --verbose:
rustc 1.61.0-nightly (ec667fbcf 2022-04-04)
binary: rustc
commit-hash: ec667fbcfcd29e2b5080f6be04e229356b27e600
commit-date: 2022-04-04
host: x86_64-unknown-linux-gnu
release: 1.61.0-nightly
LLVM version: 14.0.0
Error output
error: internal compiler error: no errors encountered even though `delay_span_bug` issued
error: internal compiler error: Encountered error `Unimplemented` selecting `Binder(<F as std::ops::Fn<((),)>>, [])` during codegen
|
= note: delayed at compiler/rustc_trait_selection/src/traits/codegen.rs:65:43
thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1309:13
stack backtrace:
0: 0x7fb62369e1bd - std::backtrace_rs::backtrace::libunwind::trace::heec4f07b572dff4a
at /rustc/ec667fbcfcd29e2b5080f6be04e229356b27e600/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
1: 0x7fb62369e1bd - std::backtrace_rs::backtrace::trace_unsynchronized::h27f126e1ba2fc9fe
at /rustc/ec667fbcfcd29e2b5080f6be04e229356b27e600/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x7fb62369e1bd - std::sys_common::backtrace::_print_fmt::h1ad2cfa418d019be
at /rustc/ec667fbcfcd29e2b5080f6be04e229356b27e600/library/std/src/sys_common/backtrace.rs:66:5
3: 0x7fb62369e1bd - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h71bda82396ca2ccb
at /rustc/ec667fbcfcd29e2b5080f6be04e229356b27e600/library/std/src/sys_common/backtrace.rs:45:22
4: 0x7fb6236f800c - core::fmt::write::haf21212323ab55a6
at /rustc/ec667fbcfcd29e2b5080f6be04e229356b27e600/library/core/src/fmt/mod.rs:1194:17
5: 0x7fb62368f711 - std::io::Write::write_fmt::h709567098e8bb7a3
at /rustc/ec667fbcfcd29e2b5080f6be04e229356b27e600/library/std/src/io/mod.rs:1655:15
6: 0x7fb6236a12a5 - std::sys_common::backtrace::_print::h7bdb328e8fb5bc9c
at /rustc/ec667fbcfcd29e2b5080f6be04e229356b27e600/library/std/src/sys_common/backtrace.rs:48:5
7: 0x7fb6236a12a5 - std::sys_common::backtrace::print::ha66a358ec62b9f56
at /rustc/ec667fbcfcd29e2b5080f6be04e229356b27e600/library/std/src/sys_common/backtrace.rs:35:9
8: 0x7fb6236a12a5 - std::panicking::default_hook::{{closure}}::h42888aa46b817168
at /rustc/ec667fbcfcd29e2b5080f6be04e229356b27e600/library/std/src/panicking.rs:295:22
9: 0x7fb6236a0f59 - std::panicking::default_hook::h2f63747e8b20dcce
at /rustc/ec667fbcfcd29e2b5080f6be04e229356b27e600/library/std/src/panicking.rs:314:9
10: 0x7fb623eadb31 - rustc_driver[da51e8717594c06]::DEFAULT_HOOK::{closure#0}::{closure#0}
11: 0x7fb6236a19f0 - std::panicking::rust_panic_with_hook::hffc556aebc44ec87
at /rustc/ec667fbcfcd29e2b5080f6be04e229356b27e600/library/std/src/panicking.rs:702:17
12: 0x7fb624f85221 - std[f6c29e8191ad9162]::panicking::begin_panic::<rustc_errors[28fdae027b88b0d3]::ExplicitBug>::{closure#0}
13: 0x7fb624f85096 - std[f6c29e8191ad9162]::sys_common::backtrace::__rust_end_short_backtrace::<std[f6c29e8191ad9162]::panicking::begin_panic<rustc_errors[28fdae027b88b0d3]::ExplicitBug>::{closure#0}, !>
14: 0x7fb624f86646 - std[f6c29e8191ad9162]::panicking::begin_panic::<rustc_errors[28fdae027b88b0d3]::ExplicitBug>
15: 0x7fb624f93126 - std[f6c29e8191ad9162]::panic::panic_any::<rustc_errors[28fdae027b88b0d3]::ExplicitBug>
16: 0x7fb62667b63a - <rustc_errors[28fdae027b88b0d3]::HandlerInner as core[a94a316f25bee083]::ops::drop::Drop>::drop
17: 0x7fb625d99d58 - core[a94a316f25bee083]::ptr::drop_in_place::<rustc_session[e1d6914d0f769cb2]::parse::ParseSess>
18: 0x7fb625d9ca03 - <alloc[ca428d0dd1bb949c]::rc::Rc<rustc_session[e1d6914d0f769cb2]::session::Session> as core[a94a316f25bee083]::ops::drop::Drop>::drop
19: 0x7fb625d831bd - core[a94a316f25bee083]::ptr::drop_in_place::<rustc_interface[ab2911a8b2c2c556]::interface::Compiler>
20: 0x7fb625d82835 - rustc_span[d93c874db11a808b]::with_source_map::<core[a94a316f25bee083]::result::Result<(), rustc_errors[28fdae027b88b0d3]::ErrorGuaranteed>, rustc_interface[ab2911a8b2c2c556]::interface::create_compiler_and_run<core[a94a316f25bee083]::result::Result<(), rustc_errors[28fdae027b88b0d3]::ErrorGuaranteed>, rustc_driver[da51e8717594c06]::run_compiler::{closure#1}>::{closure#1}>
21: 0x7fb625d9dca4 - rustc_interface[ab2911a8b2c2c556]::interface::create_compiler_and_run::<core[a94a316f25bee083]::result::Result<(), rustc_errors[28fdae027b88b0d3]::ErrorGuaranteed>, rustc_driver[da51e8717594c06]::run_compiler::{closure#1}>
22: 0x7fb625d80de2 - <scoped_tls[49782f0079b233c3]::ScopedKey<rustc_span[d93c874db11a808b]::SessionGlobals>>::set::<rustc_interface[ab2911a8b2c2c556]::interface::run_compiler<core[a94a316f25bee083]::result::Result<(), rustc_errors[28fdae027b88b0d3]::ErrorGuaranteed>, rustc_driver[da51e8717594c06]::run_compiler::{closure#1}>::{closure#0}, core[a94a316f25bee083]::result::Result<(), rustc_errors[28fdae027b88b0d3]::ErrorGuaranteed>>
23: 0x7fb625d9699f - std[f6c29e8191ad9162]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[ab2911a8b2c2c556]::util::run_in_thread_pool_with_globals<rustc_interface[ab2911a8b2c2c556]::interface::run_compiler<core[a94a316f25bee083]::result::Result<(), rustc_errors[28fdae027b88b0d3]::ErrorGuaranteed>, rustc_driver[da51e8717594c06]::run_compiler::{closure#1}>::{closure#0}, core[a94a316f25bee083]::result::Result<(), rustc_errors[28fdae027b88b0d3]::ErrorGuaranteed>>::{closure#0}, core[a94a316f25bee083]::result::Result<(), rustc_errors[28fdae027b88b0d3]::ErrorGuaranteed>>
24: 0x7fb625d82119 - <<std[f6c29e8191ad9162]::thread::Builder>::spawn_unchecked_<rustc_interface[ab2911a8b2c2c556]::util::run_in_thread_pool_with_globals<rustc_interface[ab2911a8b2c2c556]::interface::run_compiler<core[a94a316f25bee083]::result::Result<(), rustc_errors[28fdae027b88b0d3]::ErrorGuaranteed>, rustc_driver[da51e8717594c06]::run_compiler::{closure#1}>::{closure#0}, core[a94a316f25bee083]::result::Result<(), rustc_errors[28fdae027b88b0d3]::ErrorGuaranteed>>::{closure#0}, core[a94a316f25bee083]::result::Result<(), rustc_errors[28fdae027b88b0d3]::ErrorGuaranteed>>::{closure#1} as core[a94a316f25bee083]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
25: 0x7fb6236abbe3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hb733ebfa7dfa7117
at /rustc/ec667fbcfcd29e2b5080f6be04e229356b27e600/library/alloc/src/boxed.rs:1861:9
26: 0x7fb6236abbe3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h5bd940b278e4b294
at /rustc/ec667fbcfcd29e2b5080f6be04e229356b27e600/library/alloc/src/boxed.rs:1861:9
27: 0x7fb6236abbe3 - std::sys::unix::thread::Thread::new::thread_start::h3e807ea239c319c1
at /rustc/ec667fbcfcd29e2b5080f6be04e229356b27e600/library/std/src/sys/unix/thread.rs:108:17
28: 0x7fb6234835c2 - start_thread
29: 0x7fb623508584 - __clone
30: 0x0 - <unknown>
note: 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: rustc 1.61.0-nightly (ec667fbcf 2022-04-04) running on x86_64-unknown-linux-gnu
note: compiler flags: -Z mir-opt-level=3
query stack during panic:
end of query stack
Backtrace
cc @compiler-errors I believe this might be caused by #95031
Activity
compiler-errors commentedon Apr 4, 2022
I'll look into it regardless
matthiaskrgr commentedon Apr 4, 2022
@allexgray the nightly that contains suspicious commit has not been released yet, there is no point in trying to reproduce this with nightly (or even stable).
You'll need something that contains
ec667fbcfcd29e2b5080f6be04e229356b27e600compiler-errors commentedon Apr 4, 2022
This is the same issue that I identified in #94238, but the bug identified and fixed in #95031 actually caused it to not be triggered until now.
The issue here is a "trivial bound" (
for<'a> &'a D: Tr,) causing us to not select<&D as Tr>::It => ()but<&D as Tr>::It => <&D as Tr>::Itin the MIR inliner. The caching bug actually caused the latter branch to happen everywhere, so when that bug was fixed, we started to normalize<&D as Tr>::Itto()in some places, causing this ICE. I bet I could trigger an ICE with a slight modification to this code using the inliner even with #95031 reverted.This is probably only triggered by the inliner, but the MIR inliner isn't enabled without
-Zmir-opt-levelbeing explicitly provided, right?Rollup merge of rust-lang#98005 - compiler-errors:impossible-bounds, …
Rollup merge of rust-lang#98005 - compiler-errors:impossible-bounds, …
Rollup merge of rust-lang#98005 - compiler-errors:impossible-bounds, …