Closed
Description
auto-reduced (treereduce-rust):
#![feature(non_lifetime_binders)]
trait Foo: for<T> Bar<T> {}
trait Bar<T: ?Sized> {
fn method(&self) {}
}
fn needs_bar(_: *mut Type2) {}
fn main() {
let x: &dyn Foo = &();
needs_bar(x);
}
original:
#![feature(non_lifetime_binders)]
//~^ WARN the feature `non_lifetime_binders` is incomplete
trait Foo: for<T> Bar<T> {}
trait Bar<T: ?Sized> {
fn method(&self) {}
}
fn needs_bar(_: *mut Type2) {
x.method();
}
impl Foo for () {}
impl<T: ?Sized> Bar<T> for () {}
fn main() {
let x: &dyn Foo = &();
//~^ ERROR the trait `Foo` cannot be made into an object
//~| ERROR the trait `Foo` cannot be made into an object
needs_bar(x);
//~^ ERROR the trait `Foo` cannot be made into an object
}Version information
rustc 1.78.0-nightly (26cd5d862 2024-02-25)
binary: rustc
commit-hash: 26cd5d862e22c013ecb3396b177d3af80e95c836
commit-date: 2024-02-25
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 `Type2` in this scope
--> /tmp/icemaker_global_tempdir.6WS8gItM5jly/rustc_testrunner_tmpdir_reporting.dbAqHJzMl0ez/mvce.rs:9:22
|
9 | fn needs_bar(_: *mut Type2) {}
| ^^^^^ not found in this scope
warning: the feature `non_lifetime_binders` is incomplete and may not be safe to use and/or cause compiler crashes
--> /tmp/icemaker_global_tempdir.6WS8gItM5jly/rustc_testrunner_tmpdir_reporting.dbAqHJzMl0ez/mvce.rs:1:12
|
1 | #![feature(non_lifetime_binders)]
| ^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
= note: `#[warn(incomplete_features)]` on by default
error[E0038]: the trait `Foo` cannot be made into an object
--> /tmp/icemaker_global_tempdir.6WS8gItM5jly/rustc_testrunner_tmpdir_reporting.dbAqHJzMl0ez/mvce.rs:12:23
|
12 | let x: &dyn Foo = &();
| ^^^ `Foo` cannot be made into an object
|
note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
--> /tmp/icemaker_global_tempdir.6WS8gItM5jly/rustc_testrunner_tmpdir_reporting.dbAqHJzMl0ez/mvce.rs:3:12
|
3 | trait Foo: for<T> Bar<T> {}
| --- ^^^^^^^^^^^^^ ...because where clause cannot reference non-lifetime `for<...>` variables
| |
| this trait cannot be made into an object...
= note: required for the cast from `&()` to `&dyn Foo`
error[E0038]: the trait `Foo` cannot be made into an object
--> /tmp/icemaker_global_tempdir.6WS8gItM5jly/rustc_testrunner_tmpdir_reporting.dbAqHJzMl0ez/mvce.rs:12:12
|
12 | let x: &dyn Foo = &();
| ^^^^^^^^ `Foo` cannot be made into an object
|
note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
--> /tmp/icemaker_global_tempdir.6WS8gItM5jly/rustc_testrunner_tmpdir_reporting.dbAqHJzMl0ez/mvce.rs:3:12
|
3 | trait Foo: for<T> Bar<T> {}
| --- ^^^^^^^^^^^^^ ...because where clause cannot reference non-lifetime `for<...>` variables
| |
| this trait cannot be made into an object...
error: internal compiler error: tried to select method from HRTB with non-lifetime bound vars
--> /tmp/icemaker_global_tempdir.6WS8gItM5jly/rustc_testrunner_tmpdir_reporting.dbAqHJzMl0ez/mvce.rs:14:15
|
14 | needs_bar(x);
| ^
thread 'rustc' panicked at compiler/rustc_hir_typeck/src/method/probe.rs:807:28:
Box<dyn Any>
stack backtrace:
0: 0x7efcc778ca06 - std::backtrace_rs::backtrace::libunwind::trace::h2b754d54d1bde505
at /rustc/26cd5d862e22c013ecb3396b177d3af80e95c836/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
1: 0x7efcc778ca06 - std::backtrace_rs::backtrace::trace_unsynchronized::h543e1ca101948fd5
at /rustc/26cd5d862e22c013ecb3396b177d3af80e95c836/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x7efcc778ca06 - std::sys_common::backtrace::_print_fmt::h530a113cbf476cc2
at /rustc/26cd5d862e22c013ecb3396b177d3af80e95c836/library/std/src/sys_common/backtrace.rs:68:5
3: 0x7efcc778ca06 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hdaaebae0c7e457dd
at /rustc/26cd5d862e22c013ecb3396b177d3af80e95c836/library/std/src/sys_common/backtrace.rs:44:22
4: 0x7efcc77dd98c - core::fmt::rt::Argument::fmt::h986a5c541218a991
at /rustc/26cd5d862e22c013ecb3396b177d3af80e95c836/library/core/src/fmt/rt.rs:142:9
5: 0x7efcc77dd98c - core::fmt::write::h0480b093981ac277
at /rustc/26cd5d862e22c013ecb3396b177d3af80e95c836/library/core/src/fmt/mod.rs:1120:17
6: 0x7efcc77813cf - std::io::Write::write_fmt::he3dd140cfd4aef89
at /rustc/26cd5d862e22c013ecb3396b177d3af80e95c836/library/std/src/io/mod.rs:1846:15
7: 0x7efcc778c7b4 - std::sys_common::backtrace::_print::hdac374456098a97e
at /rustc/26cd5d862e22c013ecb3396b177d3af80e95c836/library/std/src/sys_common/backtrace.rs:47:5
8: 0x7efcc778c7b4 - std::sys_common::backtrace::print::ha7f20ab884506926
at /rustc/26cd5d862e22c013ecb3396b177d3af80e95c836/library/std/src/sys_common/backtrace.rs:34:9
9: 0x7efcc778f4fb - std::panicking::default_hook::{{closure}}::h300a405277525f5d
10: 0x7efcc778f249 - std::panicking::default_hook::hde1c193b2da6a81c
at /rustc/26cd5d862e22c013ecb3396b177d3af80e95c836/library/std/src/panicking.rs:292:9
11: 0x7efcca68892c - std[555420183d371a7f]::panicking::update_hook::<alloc[b9bf11d30073d6dd]::boxed::Box<rustc_driver_impl[633500a3532990b7]::install_ice_hook::{closure#0}>>::{closure#0}
12: 0x7efcc778fc60 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h68a9e4d741c266fd
at /rustc/26cd5d862e22c013ecb3396b177d3af80e95c836/library/alloc/src/boxed.rs:2030:9
13: 0x7efcc778fc60 - std::panicking::rust_panic_with_hook::h8ba518db0741b55a
at /rustc/26cd5d862e22c013ecb3396b177d3af80e95c836/library/std/src/panicking.rs:783:13
14: 0x7efcca6b4fd4 - std[555420183d371a7f]::panicking::begin_panic::<rustc_errors[69c26c4f67726645]::ExplicitBug>::{closure#0}
15: 0x7efcca6b1ef6 - std[555420183d371a7f]::sys_common::backtrace::__rust_end_short_backtrace::<std[555420183d371a7f]::panicking::begin_panic<rustc_errors[69c26c4f67726645]::ExplicitBug>::{closure#0}, !>
16: 0x7efcca6b1bd6 - std[555420183d371a7f]::panicking::begin_panic::<rustc_errors[69c26c4f67726645]::ExplicitBug>
17: 0x7efcca6beb21 - <rustc_errors[69c26c4f67726645]::diagnostic::BugAbort as rustc_errors[69c26c4f67726645]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
18: 0x7efccc2de675 - <rustc_hir_typeck[2ba3259e05449eae]::method::probe::ProbeContext>::assemble_inherent_candidates
19: 0x7efcca8510e4 - <rustc_hir_typeck[2ba3259e05449eae]::fn_ctxt::FnCtxt>::get_conversion_methods
20: 0x7efcca869331 - <rustc_hir_typeck[2ba3259e05449eae]::fn_ctxt::FnCtxt>::suggest_deref_ref_or_into
21: 0x7efcca849c44 - <rustc_hir_typeck[2ba3259e05449eae]::fn_ctxt::FnCtxt>::emit_type_mismatch_suggestions
22: 0x7efcca84d99d - <rustc_hir_typeck[2ba3259e05449eae]::fn_ctxt::FnCtxt>::emit_coerce_suggestions
23: 0x7efcca86235f - <rustc_hir_typeck[2ba3259e05449eae]::fn_ctxt::FnCtxt>::report_arg_errors
24: 0x7efccc540b78 - <rustc_hir_typeck[2ba3259e05449eae]::fn_ctxt::FnCtxt>::check_argument_types
25: 0x7efccc2c6947 - <rustc_hir_typeck[2ba3259e05449eae]::fn_ctxt::FnCtxt>::check_call
26: 0x7efccc4944e3 - <rustc_hir_typeck[2ba3259e05449eae]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
27: 0x7efccbfa669b - <rustc_hir_typeck[2ba3259e05449eae]::fn_ctxt::FnCtxt>::check_block_with_expected
28: 0x7efccc4949c6 - <rustc_hir_typeck[2ba3259e05449eae]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
29: 0x7efccc2f8a08 - rustc_hir_typeck[2ba3259e05449eae]::check::check_fn
30: 0x7efccbb406ad - rustc_hir_typeck[2ba3259e05449eae]::typeck
31: 0x7efccbb3f98b - rustc_query_impl[2c9e1b0525c9d953]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2c9e1b0525c9d953]::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[73325823477bd615]::query::erase::Erased<[u8; 8usize]>>
32: 0x7efccbd0e570 - rustc_query_system[dfd6c8aac03f3724]::query::plumbing::try_execute_query::<rustc_query_impl[2c9e1b0525c9d953]::DynamicConfig<rustc_query_system[dfd6c8aac03f3724]::query::caches::VecCache<rustc_span[dc6b5ece0d38defd]::def_id::LocalDefId, rustc_middle[73325823477bd615]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[2c9e1b0525c9d953]::plumbing::QueryCtxt, false>
33: 0x7efccbd0e08c - rustc_query_impl[2c9e1b0525c9d953]::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
34: 0x7efccc3cd4d2 - <rustc_middle[73325823477bd615]::hir::map::Map>::par_body_owners::<rustc_hir_analysis[7c1425229e6d6e04]::check_crate::{closure#6}>::{closure#0}
35: 0x7efccc3cbd9d - rustc_hir_analysis[7c1425229e6d6e04]::check_crate
36: 0x7efccc6059af - rustc_interface[27abfdff6e6b27c2]::passes::analysis
37: 0x7efccc605619 - rustc_query_impl[2c9e1b0525c9d953]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2c9e1b0525c9d953]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[73325823477bd615]::query::erase::Erased<[u8; 1usize]>>
38: 0x7efccc71f8e5 - rustc_query_system[dfd6c8aac03f3724]::query::plumbing::try_execute_query::<rustc_query_impl[2c9e1b0525c9d953]::DynamicConfig<rustc_query_system[dfd6c8aac03f3724]::query::caches::SingleCache<rustc_middle[73325823477bd615]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[2c9e1b0525c9d953]::plumbing::QueryCtxt, false>
39: 0x7efccc71f649 - rustc_query_impl[2c9e1b0525c9d953]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
40: 0x7efccc72eb16 - rustc_interface[27abfdff6e6b27c2]::interface::run_compiler::<core[421030ac42e8f54b]::result::Result<(), rustc_span[dc6b5ece0d38defd]::ErrorGuaranteed>, rustc_driver_impl[633500a3532990b7]::run_compiler::{closure#0}>::{closure#0}
41: 0x7efccc9c8cc5 - std[555420183d371a7f]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[27abfdff6e6b27c2]::util::run_in_thread_with_globals<rustc_interface[27abfdff6e6b27c2]::util::run_in_thread_pool_with_globals<rustc_interface[27abfdff6e6b27c2]::interface::run_compiler<core[421030ac42e8f54b]::result::Result<(), rustc_span[dc6b5ece0d38defd]::ErrorGuaranteed>, rustc_driver_impl[633500a3532990b7]::run_compiler::{closure#0}>::{closure#0}, core[421030ac42e8f54b]::result::Result<(), rustc_span[dc6b5ece0d38defd]::ErrorGuaranteed>>::{closure#0}, core[421030ac42e8f54b]::result::Result<(), rustc_span[dc6b5ece0d38defd]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[421030ac42e8f54b]::result::Result<(), rustc_span[dc6b5ece0d38defd]::ErrorGuaranteed>>
42: 0x7efccc9c8af2 - <<std[555420183d371a7f]::thread::Builder>::spawn_unchecked_<rustc_interface[27abfdff6e6b27c2]::util::run_in_thread_with_globals<rustc_interface[27abfdff6e6b27c2]::util::run_in_thread_pool_with_globals<rustc_interface[27abfdff6e6b27c2]::interface::run_compiler<core[421030ac42e8f54b]::result::Result<(), rustc_span[dc6b5ece0d38defd]::ErrorGuaranteed>, rustc_driver_impl[633500a3532990b7]::run_compiler::{closure#0}>::{closure#0}, core[421030ac42e8f54b]::result::Result<(), rustc_span[dc6b5ece0d38defd]::ErrorGuaranteed>>::{closure#0}, core[421030ac42e8f54b]::result::Result<(), rustc_span[dc6b5ece0d38defd]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[421030ac42e8f54b]::result::Result<(), rustc_span[dc6b5ece0d38defd]::ErrorGuaranteed>>::{closure#1} as core[421030ac42e8f54b]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
43: 0x7efcc7799635 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h176656733d324092
at /rustc/26cd5d862e22c013ecb3396b177d3af80e95c836/library/alloc/src/boxed.rs:2016:9
44: 0x7efcc7799635 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h2cb067df8c4b40c7
at /rustc/26cd5d862e22c013ecb3396b177d3af80e95c836/library/alloc/src/boxed.rs:2016:9
45: 0x7efcc7799635 - std::sys::pal::unix::thread::Thread::new::thread_start::h9c4fa792b58c770f
at /rustc/26cd5d862e22c013ecb3396b177d3af80e95c836/library/std/src/sys/pal/unix/thread.rs:108:17
46: 0x7efcc758155a - <unknown>
47: 0x7efcc75fea3c - <unknown>
48: 0x0 - <unknown>
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 (26cd5d862 2024-02-25) running on x86_64-unknown-linux-gnu
query stack during panic:
#0 [typeck] type-checking `main`
#1 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 4 previous errors; 1 warning emitted
Some errors have detailed explanations: E0038, E0412.
For more information about an error, try `rustc --explain E0038`.