error[E0275]: overflow evaluating the requirement `W<W<W<_>>>: Trait`
|
= help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`ice`)
note: required for `W<W<W<W<W<_>>>>>` to implement `Trait`
--> ice.rs:6:17
|
6 | impl<T: ?Sized> Trait for W<W<W<T>>>
| ^^^^^ ^^^^^^^^^^
7 | where
8 | W<T>: Trait,
| ----- unsatisfied trait bound introduced here
= note: 126 redundant requirements hidden
= note: required for `W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<...>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>` to implement `Trait`
= note: the full name for the type has been written to 'ice.long-type-16872895002395984658.txt'
= note: consider using `--verbose` to print the full type name to the console
error[E0107]: trait takes 0 generic arguments but 1 generic argument was supplied
--> ice.rs:14:9
|
14 | impl<T: Trait<W<T>>> NoOverlap for T {}
| ^^^^^ expected 0 generic arguments
|
note: trait defined here, with 0 generic parameters
--> ice.rs:1:7
|
1 | trait Trait {
| ^^^^^
help: replace the generic bound with the associated type
|
14 | impl<T: Trait<Assoc = W<T>>> NoOverlap for T {}
| +++++++
Backtrace
```
error: internal compiler error: compiler/rustc_trait_selection/src/solve/fulfill.rs:264:17: did not expect selection error when collecting ambiguity errors
thread 'rustc' panicked at compiler/rustc_trait_selection/src/solve/fulfill.rs:264:17:
Box
stack backtrace:
0: 0x7a8d62606b35 - std::backtrace_rs::backtrace::libunwind::trace::h918aaf6e60cc0a20
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
1: 0x7a8d62606b35 - std::backtrace_rs::backtrace::trace_unsynchronized::h2eac6c94b93f8e3c
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x7a8d62606b35 - std::sys_common::backtrace::_print_fmt::h8e5edaeb6a4352e8
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/sys_common/backtrace.rs:68:5
3: 0x7a8d62606b35 - ::fmt::hf5cc6736d08af678
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/sys_common/backtrace.rs:44:22
4: 0x7a8d62655cfb - core::fmt::rt::Argument::fmt::hb75c12041eb78bdc
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/core/src/fmt/rt.rs:165:63
5: 0x7a8d62655cfb - core::fmt::write::h3e6a6276a812b52d
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/core/src/fmt/mod.rs:1157:21
6: 0x7a8d625fb87f - std::io::Write::write_fmt::h1eb4d2f52c7badcc
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/io/mod.rs:1835:15
7: 0x7a8d6260690e - std::sys_common::backtrace::_print::h027a355b4099d109
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/sys_common/backtrace.rs:47:5
8: 0x7a8d6260690e - std::sys_common::backtrace::print::h9288434216016cb8
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/sys_common/backtrace.rs:34:9
9: 0x7a8d62609279 - std::panicking::default_hook::{{closure}}::hb774f76bb0cbe3f3
10: 0x7a8d62608fbd - std::panicking::default_hook::h5e6bb2fe4f610e68
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/panicking.rs:298:9
11: 0x7a8d5eeb3d1f - std[2409bda48c37ea6b]::panicking::update_hook::>::{closure#0}
12: 0x7a8d62609976 - as core::ops::function::Fn>::call::h150247b09595b272
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/alloc/src/boxed.rs:2036:9
13: 0x7a8d62609976 - std::panicking::rust_panic_with_hook::h193842b19bca8c30
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/panicking.rs:799:13
14: 0x7a8d5eee3cd4 - std[2409bda48c37ea6b]::panicking::begin_panic::::{closure#0}
15: 0x7a8d5eee0686 - std[2409bda48c37ea6b]::sys_common::backtrace::__rust_end_short_backtrace::::{closure#0}, !>
16: 0x7a8d5eedbc66 - std[2409bda48c37ea6b]::panicking::begin_panic::
17: 0x7a8d5eeece61 - ::emit_producing_guarantee
18: 0x7a8d5f3a04fc - rustc_middle[d85377d387f08e9a]::util::bug::opt_span_bug_fmt::::{closure#0}
19: 0x7a8d5f384eca - rustc_middle[d85377d387f08e9a]::ty::context::tls::with_opt::::{closure#0}, !>::{closure#0}
20: 0x7a8d5f384d4b - rustc_middle[d85377d387f08e9a]::ty::context::tls::with_context_opt::::{closure#0}, !>::{closure#0}, !>
21: 0x7a8d5d09cdd0 - rustc_middle[d85377d387f08e9a]::util::bug::bug_fmt
22: 0x7a8d5f9d8dd7 - ::collect_remaining_errors
23: 0x7a8d60575ba8 - ::select_all_or_error
24: 0x7a8d607198de - rustc_trait_selection[e301c94095ae1ef9]::traits::coherence::overlap
25: 0x7a8d60e75591 - ::insert
26: 0x7a8d5dedfa68 - ::insert
27: 0x7a8d602866bc - rustc_trait_selection[e301c94095ae1ef9]::traits::specialize::specialization_graph_provider
28: 0x7a8d6028621f - rustc_query_impl[f7d6eb8805e88c29]::plumbing::__rust_begin_short_backtrace::>
29: 0x7a8d60288c17 - rustc_query_system[bd604859ea317a95]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[f7d6eb8805e88c29]::plumbing::QueryCtxt, false>
30: 0x7a8d608f2a32 - rustc_query_impl[f7d6eb8805e88c29]::query_impl::specialization_graph_of::get_query_non_incr::__rust_end_short_backtrace
31: 0x7a8d60d62cb0 - rustc_hir_analysis[c4ab2add954ac9f7]::coherence::coherent_trait
32: 0x7a8d60d629a3 - rustc_query_impl[f7d6eb8805e88c29]::plumbing::__rust_begin_short_backtrace::>
33: 0x7a8d606bb793 - rustc_query_system[bd604859ea317a95]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[f7d6eb8805e88c29]::plumbing::QueryCtxt, false>
34: 0x7a8d606b9e89 - rustc_query_impl[f7d6eb8805e88c29]::query_impl::coherent_trait::get_query_non_incr::__rust_end_short_backtrace
35: 0x7a8d608155ca - rustc_hir_analysis[c4ab2add954ac9f7]::check::wfcheck::check_well_formed
36: 0x7a8d608133ad - rustc_query_impl[f7d6eb8805e88c29]::plumbing::__rust_begin_short_backtrace::>
37: 0x7a8d60812b40 - rustc_query_system[bd604859ea317a95]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[f7d6eb8805e88c29]::plumbing::QueryCtxt, false>
38: 0x7a8d608128bf - rustc_query_impl[f7d6eb8805e88c29]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
39: 0x7a8d60810801 - rustc_hir_analysis[c4ab2add954ac9f7]::check::wfcheck::check_mod_type_wf
40: 0x7a8d60810647 - rustc_query_impl[f7d6eb8805e88c29]::plumbing::__rust_begin_short_backtrace::>
41: 0x7a8d60fb48c6 - rustc_query_system[bd604859ea317a95]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[f7d6eb8805e88c29]::plumbing::QueryCtxt, false>
42: 0x7a8d60fb467f - rustc_query_impl[f7d6eb8805e88c29]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
43: 0x7a8d6052219e - rustc_hir_analysis[c4ab2add954ac9f7]::check_crate
44: 0x7a8d60518c47 - rustc_interface[45e847dd6c11ec07]::passes::analysis
45: 0x7a8d60518787 - rustc_query_impl[f7d6eb8805e88c29]::plumbing::__rust_begin_short_backtrace::>
46: 0x7a8d60faf165 - rustc_query_system[bd604859ea317a95]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[f7d6eb8805e88c29]::plumbing::QueryCtxt, false>
47: 0x7a8d60faeec9 - rustc_query_impl[f7d6eb8805e88c29]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
48: 0x7a8d60e270ce - rustc_interface[45e847dd6c11ec07]::interface::run_compiler::, rustc_driver_impl[3b65384176704029]::run_compiler::{closure#0}>::{closure#1}
49: 0x7a8d60e126c9 - std[2409bda48c37ea6b]::sys_common::backtrace::__rust_begin_short_backtrace::, rustc_driver_impl[3b65384176704029]::run_compiler::{closure#0}>::{closure#1}, core[e58631ecc326099b]::result::Result<(), rustc_span[86ddde2698e45e98]::ErrorGuaranteed>>::{closure#0}, core[e58631ecc326099b]::result::Result<(), rustc_span[86ddde2698e45e98]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[e58631ecc326099b]::result::Result<(), rustc_span[86ddde2698e45e98]::ErrorGuaranteed>>
50: 0x7a8d60e12478 - <::spawn_unchecked_, rustc_driver_impl[3b65384176704029]::run_compiler::{closure#0}>::{closure#1}, core[e58631ecc326099b]::result::Result<(), rustc_span[86ddde2698e45e98]::ErrorGuaranteed>>::{closure#0}, core[e58631ecc326099b]::result::Result<(), rustc_span[86ddde2698e45e98]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[e58631ecc326099b]::result::Result<(), rustc_span[86ddde2698e45e98]::ErrorGuaranteed>>::{closure#2} as core[e58631ecc326099b]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
51: 0x7a8d626137bb - as core::ops::function::FnOnce>::call_once::h02edc3183d1b3ab4
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/alloc/src/boxed.rs:2022:9
52: 0x7a8d626137bb - as core::ops::function::FnOnce>::call_once::hd14ff6036f87e3a7
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/alloc/src/boxed.rs:2022:9
53: 0x7a8d626137bb - std::sys::pal::unix::thread::Thread::new::thread_start::he158ab2f3983310c
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/sys/pal/unix/thread.rs:108:17
54: 0x7a8d623b255a -
55: 0x7a8d6242fa3c -
56: 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: please make sure that you have updated to the latest nightly
note: please attach the file at `/tmp/im/rustc-ice-2024-05-07T15_33_11-55686.txt` to your bug report
note: compiler flags: -Z next-solver=coherence
query stack during panic:
#0 [specialization_graph_of] building specialization graph of trait `NoOverlap`
#1 [coherent_trait] coherence checking all impls of trait `NoOverlap`
#2 [check_well_formed] checking that `` is well-formed
#3 [check_mod_type_wf] checking that types are well-formed in top-level module
#4 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0107, E0275.
For more information about an error, try `rustc --explain E0107`.
```
matthiaskrgr
commented
6 months ago
Code
Meta
rustc --version --verbose:Error output
` rustc ice.rs -Znext-solver=coherence
Backtrace
``` error: internal compiler error: compiler/rustc_trait_selection/src/solve/fulfill.rs:264:17: did not expect selection error when collecting ambiguity errors thread 'rustc' panicked at compiler/rustc_trait_selection/src/solve/fulfill.rs:264:17: Box
stack backtrace:
0: 0x7a8d62606b35 - std::backtrace_rs::backtrace::libunwind::trace::h918aaf6e60cc0a20
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
1: 0x7a8d62606b35 - std::backtrace_rs::backtrace::trace_unsynchronized::h2eac6c94b93f8e3c
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x7a8d62606b35 - std::sys_common::backtrace::_print_fmt::h8e5edaeb6a4352e8
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/sys_common/backtrace.rs:68:5
3: 0x7a8d62606b35 - ::fmt::hf5cc6736d08af678
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/sys_common/backtrace.rs:44:22
4: 0x7a8d62655cfb - core::fmt::rt::Argument::fmt::hb75c12041eb78bdc
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/core/src/fmt/rt.rs:165:63
5: 0x7a8d62655cfb - core::fmt::write::h3e6a6276a812b52d
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/core/src/fmt/mod.rs:1157:21
6: 0x7a8d625fb87f - std::io::Write::write_fmt::h1eb4d2f52c7badcc
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/io/mod.rs:1835:15
7: 0x7a8d6260690e - std::sys_common::backtrace::_print::h027a355b4099d109
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/sys_common/backtrace.rs:47:5
8: 0x7a8d6260690e - std::sys_common::backtrace::print::h9288434216016cb8
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/sys_common/backtrace.rs:34:9
9: 0x7a8d62609279 - std::panicking::default_hook::{{closure}}::hb774f76bb0cbe3f3
10: 0x7a8d62608fbd - std::panicking::default_hook::h5e6bb2fe4f610e68
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/panicking.rs:298:9
11: 0x7a8d5eeb3d1f - std[2409bda48c37ea6b]::panicking::update_hook::>::{closure#0}
12: 0x7a8d62609976 - as core::ops::function::Fn>::call::h150247b09595b272
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/alloc/src/boxed.rs:2036:9
13: 0x7a8d62609976 - std::panicking::rust_panic_with_hook::h193842b19bca8c30
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/panicking.rs:799:13
14: 0x7a8d5eee3cd4 - std[2409bda48c37ea6b]::panicking::begin_panic::::{closure#0}
15: 0x7a8d5eee0686 - std[2409bda48c37ea6b]::sys_common::backtrace::__rust_end_short_backtrace::::{closure#0}, !>
16: 0x7a8d5eedbc66 - std[2409bda48c37ea6b]::panicking::begin_panic::
17: 0x7a8d5eeece61 - ::emit_producing_guarantee
18: 0x7a8d5f3a04fc - rustc_middle[d85377d387f08e9a]::util::bug::opt_span_bug_fmt::::{closure#0}
19: 0x7a8d5f384eca - rustc_middle[d85377d387f08e9a]::ty::context::tls::with_opt::::{closure#0}, !>::{closure#0}
20: 0x7a8d5f384d4b - rustc_middle[d85377d387f08e9a]::ty::context::tls::with_context_opt::::{closure#0}, !>::{closure#0}, !>
21: 0x7a8d5d09cdd0 - rustc_middle[d85377d387f08e9a]::util::bug::bug_fmt
22: 0x7a8d5f9d8dd7 - ::collect_remaining_errors
23: 0x7a8d60575ba8 - ::select_all_or_error
24: 0x7a8d607198de - rustc_trait_selection[e301c94095ae1ef9]::traits::coherence::overlap
25: 0x7a8d60e75591 - ::insert
26: 0x7a8d5dedfa68 - ::insert
27: 0x7a8d602866bc - rustc_trait_selection[e301c94095ae1ef9]::traits::specialize::specialization_graph_provider
28: 0x7a8d6028621f - rustc_query_impl[f7d6eb8805e88c29]::plumbing::__rust_begin_short_backtrace::>
29: 0x7a8d60288c17 - rustc_query_system[bd604859ea317a95]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[f7d6eb8805e88c29]::plumbing::QueryCtxt, false>
30: 0x7a8d608f2a32 - rustc_query_impl[f7d6eb8805e88c29]::query_impl::specialization_graph_of::get_query_non_incr::__rust_end_short_backtrace
31: 0x7a8d60d62cb0 - rustc_hir_analysis[c4ab2add954ac9f7]::coherence::coherent_trait
32: 0x7a8d60d629a3 - rustc_query_impl[f7d6eb8805e88c29]::plumbing::__rust_begin_short_backtrace::>
33: 0x7a8d606bb793 - rustc_query_system[bd604859ea317a95]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[f7d6eb8805e88c29]::plumbing::QueryCtxt, false>
34: 0x7a8d606b9e89 - rustc_query_impl[f7d6eb8805e88c29]::query_impl::coherent_trait::get_query_non_incr::__rust_end_short_backtrace
35: 0x7a8d608155ca - rustc_hir_analysis[c4ab2add954ac9f7]::check::wfcheck::check_well_formed
36: 0x7a8d608133ad - rustc_query_impl[f7d6eb8805e88c29]::plumbing::__rust_begin_short_backtrace::>
37: 0x7a8d60812b40 - rustc_query_system[bd604859ea317a95]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[f7d6eb8805e88c29]::plumbing::QueryCtxt, false>
38: 0x7a8d608128bf - rustc_query_impl[f7d6eb8805e88c29]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
39: 0x7a8d60810801 - rustc_hir_analysis[c4ab2add954ac9f7]::check::wfcheck::check_mod_type_wf
40: 0x7a8d60810647 - rustc_query_impl[f7d6eb8805e88c29]::plumbing::__rust_begin_short_backtrace::>
41: 0x7a8d60fb48c6 - rustc_query_system[bd604859ea317a95]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[f7d6eb8805e88c29]::plumbing::QueryCtxt, false>
42: 0x7a8d60fb467f - rustc_query_impl[f7d6eb8805e88c29]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
43: 0x7a8d6052219e - rustc_hir_analysis[c4ab2add954ac9f7]::check_crate
44: 0x7a8d60518c47 - rustc_interface[45e847dd6c11ec07]::passes::analysis
45: 0x7a8d60518787 - rustc_query_impl[f7d6eb8805e88c29]::plumbing::__rust_begin_short_backtrace::>
46: 0x7a8d60faf165 - rustc_query_system[bd604859ea317a95]::query::plumbing::try_execute_query::>, false, false, false>, rustc_query_impl[f7d6eb8805e88c29]::plumbing::QueryCtxt, false>
47: 0x7a8d60faeec9 - rustc_query_impl[f7d6eb8805e88c29]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
48: 0x7a8d60e270ce - rustc_interface[45e847dd6c11ec07]::interface::run_compiler::, rustc_driver_impl[3b65384176704029]::run_compiler::{closure#0}>::{closure#1}
49: 0x7a8d60e126c9 - std[2409bda48c37ea6b]::sys_common::backtrace::__rust_begin_short_backtrace::, rustc_driver_impl[3b65384176704029]::run_compiler::{closure#0}>::{closure#1}, core[e58631ecc326099b]::result::Result<(), rustc_span[86ddde2698e45e98]::ErrorGuaranteed>>::{closure#0}, core[e58631ecc326099b]::result::Result<(), rustc_span[86ddde2698e45e98]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[e58631ecc326099b]::result::Result<(), rustc_span[86ddde2698e45e98]::ErrorGuaranteed>>
50: 0x7a8d60e12478 - <::spawn_unchecked_, rustc_driver_impl[3b65384176704029]::run_compiler::{closure#0}>::{closure#1}, core[e58631ecc326099b]::result::Result<(), rustc_span[86ddde2698e45e98]::ErrorGuaranteed>>::{closure#0}, core[e58631ecc326099b]::result::Result<(), rustc_span[86ddde2698e45e98]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[e58631ecc326099b]::result::Result<(), rustc_span[86ddde2698e45e98]::ErrorGuaranteed>>::{closure#2} as core[e58631ecc326099b]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
51: 0x7a8d626137bb - as core::ops::function::FnOnce>::call_once::h02edc3183d1b3ab4
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/alloc/src/boxed.rs:2022:9
52: 0x7a8d626137bb - as core::ops::function::FnOnce>::call_once::hd14ff6036f87e3a7
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/alloc/src/boxed.rs:2022:9
53: 0x7a8d626137bb - std::sys::pal::unix::thread::Thread::new::thread_start::he158ab2f3983310c
at /rustc/7d83a4c131ab9ae81a74c6fd825c827d74a2881d/library/std/src/sys/pal/unix/thread.rs:108:17
54: 0x7a8d623b255a -
55: 0x7a8d6242fa3c -
56: 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: please make sure that you have updated to the latest nightly
note: please attach the file at `/tmp/im/rustc-ice-2024-05-07T15_33_11-55686.txt` to your bug report
note: compiler flags: -Z next-solver=coherence
query stack during panic:
#0 [specialization_graph_of] building specialization graph of trait `NoOverlap`
#1 [coherent_trait] coherence checking all impls of trait `NoOverlap`
#2 [check_well_formed] checking that `` is well-formed
#3 [check_mod_type_wf] checking that types are well-formed in top-level module
#4 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0107, E0275.
For more information about an error, try `rustc --explain E0107`.
```