Code:
use std::path::Path;
fn main() {
let path = Path::new("foo");
match path {
Path::new("foo") => println!("foo"),
Path::new("bar") => println!("bar"),
_ => (),
}
}Expected result: print foo.
Actual result:
thread 'main' panicked at 'expected fn type', libcore/option.rs:1000:5
note: Run with `RUST_BACKTRACE=1` for a 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 1.30.0 (da5f414c2 2018-10-24) running on x86_64-unknown-linux-gnu
Meta
rustc --version --verbose:
rustc 1.30.0 (da5f414c2 2018-10-24)
binary: rustc
commit-hash: da5f414c2c0bfe5198934493f04c676e2b23ff2e
commit-date: 2018-10-24
host: x86_64-unknown-linux-gnu
release: 1.30.0
LLVM version: 8.0
Backtrace:
thread 'main' panicked at 'expected fn type', libcore/option.rs:1000:5
stack backtrace:
0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
1: std::sys_common::backtrace::print
at libstd/sys_common/backtrace.rs:71
at libstd/sys_common/backtrace.rs:59
2: std::panicking::default_hook::{{closure}}
at libstd/panicking.rs:211
3: std::panicking::default_hook
at libstd/panicking.rs:227
4: rustc::util::common::panic_hook
5: std::panicking::rust_panic_with_hook
at libstd/panicking.rs:481
6: std::panicking::continue_panic_fmt
at libstd/panicking.rs:391
7: rust_begin_unwind
at libstd/panicking.rs:326
8: core::panicking::panic_fmt
at libcore/panicking.rs:77
9: core::option::expect_failed
at libcore/option.rs:1000
10: rustc_typeck::check::_match::<impl rustc_typeck::check::FnCtxt<'a, 'gcx, 'tcx>>::check_pat_tuple_struct
11: rustc_typeck::check::_match::<impl rustc_typeck::check::FnCtxt<'a, 'gcx, 'tcx>>::check_pat_walk
12: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::from_iter
13: rustc_typeck::check::FnCtxt::check_expr_kind
14: rustc_typeck::check::FnCtxt::check_expr_with_expectation_and_needs
15: rustc_typeck::check::FnCtxt::check_block_with_expected
16: rustc_typeck::check::FnCtxt::check_expr_kind
17: rustc_typeck::check::FnCtxt::check_expr_with_expectation_and_needs
18: rustc_typeck::check::FnCtxt::check_return_expr
19: rustc_typeck::check::check_fn
20: rustc::ty::context::tls::with_related_context
21: rustc::infer::InferCtxtBuilder::enter
22: rustc_typeck::check::typeck_tables_of
23: rustc::ty::query::__query_compute::typeck_tables_of
24: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors<'tcx> for rustc::ty::query::queries::typeck_tables_of<'tcx>>::compute
25: rustc::dep_graph::graph::DepGraph::with_task_impl
26: rustc::ty::context::tls::with_related_context
27: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::force_query_with_job
28: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::get_query
29: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::ensure_query
30: rustc_typeck::check::typeck_item_bodies
31: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors<'tcx> for rustc::ty::query::queries::typeck_item_bodies<'tcx>>::compute
32: rustc::dep_graph::graph::DepGraph::with_task_impl
33: rustc::ty::context::tls::with_related_context
34: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::force_query_with_job
35: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::get_query
36: rustc_typeck::check_crate
37: rustc::ty::context::tls::enter_context
38: <std::thread::local::LocalKey<T>>::with
39: rustc::ty::context::TyCtxt::create_and_enter
40: rustc_driver::driver::compile_input
41: rustc_driver::run_compiler_with_pool
42: rustc_driver::driver::spawn_thread_pool
43: rustc_driver::run_compiler
44: <scoped_tls::ScopedKey<T>>::set
45: syntax::with_globals
46: __rust_maybe_catch_panic
at libpanic_unwind/lib.rs:103
47: rustc_driver::run
48: rustc_driver::main
49: std::rt::lang_start::{{closure}}
50: std::panicking::try::do_call
at libstd/rt.rs:59
at libstd/panicking.rs:310
51: __rust_maybe_catch_panic
at libpanic_unwind/lib.rs:103
52: std::rt::lang_start_internal
at libstd/panicking.rs:289
at libstd/panic.rs:392
at libstd/rt.rs:58
53: main
54: __libc_start_main
55: <unknown>
query stack during panic:
#0 [typeck_tables_of] processing `main`
#1 [typeck_item_bodies] type-checking all item bodies
end of query stack
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 1.30.0 (da5f414c2 2018-10-24) running on x86_64-unknown-linux-gnu
Code:
Expected result: print
foo.Actual result:
Meta
rustc --version --verbose:Backtrace: