Closed
Description
Bad types can lead to an internal compiler error, rather than an error message when compiling. Only affects no_core
on nightly.
Code
#![feature(no_core, lang_items)]
#![no_core]
#[lang = "sized"]
trait Sized {}
fn foo() -> bool {
()
}
Expected
error[E0308]: mismatched types
Reality
thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', src/librustc_typeck/check/demand.rs:637:35
Meta
rustc --version --verbose
:
rustc 1.45.0-nightly (9912925c2 2020-05-10)
binary: rustc
commit-hash: 9912925c254589f58338cb2993163e618475ff75
commit-date: 2020-05-10
host: x86_64-unknown-linux-gnu
release: 1.45.0-nightly
LLVM version: 9.0
Backtrace:
thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', src/librustc_typeck/check/demand.rs:637:35
stack backtrace:
0: backtrace::backtrace::libunwind::trace
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/libunwind.rs:86
1: backtrace::backtrace::trace_unsynchronized
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/mod.rs:66
2: std::sys_common::backtrace::_print_fmt
at src/libstd/sys_common/backtrace.rs:78
3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
at src/libstd/sys_common/backtrace.rs:59
4: core::fmt::write
at src/libcore/fmt/mod.rs:1069
5: std::io::Write::write_fmt
at src/libstd/io/mod.rs:1537
6: std::sys_common::backtrace::_print
at src/libstd/sys_common/backtrace.rs:62
7: std::sys_common::backtrace::print
at src/libstd/sys_common/backtrace.rs:49
8: std::panicking::default_hook::{{closure}}
at src/libstd/panicking.rs:198
9: std::panicking::default_hook
at src/libstd/panicking.rs:218
10: rustc_driver::report_ice
11: std::panicking::rust_panic_with_hook
at src/libstd/panicking.rs:481
12: rust_begin_unwind
at src/libstd/panicking.rs:385
13: core::panicking::panic_fmt
at src/libcore/panicking.rs:89
14: core::panicking::panic
at src/libcore/panicking.rs:52
15: rustc_typeck::check::demand::<impl rustc_typeck::check::FnCtxt>::check_ref
16: rustc_typeck::check::FnCtxt::suggest_deref_ref_or_into
17: rustc_typeck::check::demand::<impl rustc_typeck::check::FnCtxt>::emit_coerce_suggestions
18: rustc_typeck::check::coercion::CoerceMany<E>::coerce_inner
19: rustc_typeck::check::FnCtxt::check_block_with_expected
20: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
21: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
22: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_return_expr
23: rustc_typeck::check::check_fn
24: rustc_middle::ty::context::GlobalCtxt::enter_local
25: rustc_typeck::check::typeck_tables_of
26: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::typeck_tables_of>::compute
27: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
28: rustc_query_system::query::plumbing::get_query_impl
29: rustc_query_system::query::plumbing::ensure_query_impl
30: rustc_typeck::check::typeck_item_bodies
31: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::typeck_item_bodies>::compute
32: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
33: rustc_query_system::query::plumbing::get_query_impl
34: rustc_typeck::check_crate
35: rustc_interface::passes::analysis
36: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute
37: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
38: rustc_data_structures::stack::ensure_sufficient_stack
39: rustc_query_system::query::plumbing::get_query_impl
40: rustc_middle::ty::context::tls::enter_global
41: rustc_interface::interface::run_compiler_in_existing_thread_pool
42: scoped_tls::ScopedKey<T>::set
43: rustc_ast::attr::with_globals
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
note: rustc 1.45.0-nightly (9912925c2 2020-05-10) running on x86_64-unknown-linux-gnu
note: compiler flags: -C debuginfo=1 -C llvm-args=--x86-asm-syntax=intel --crate-type rlib
query stack during panic:
#0 [typeck_tables_of] type-checking `foo`
#1 [typeck_item_bodies] type-checking all item bodies
#2 [analysis] running analysis passes on this crate
end of query stack