ICE: thread 'rustc' panicked at 'internal error: entered unreachable code', src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs:379:17

[toku-sa-n]

Code

#![feature(const_btree_new)]

use std::collections::BTreeMap;

struct Foo(BTreeMap<i32, i32>);
impl Foo {
    fn new() -> Self {
        Self(BTreeMap::new())
    }
}

Meta

• cargo clippy -V:
  clippy 0.1.53 (42816d6 2021-04-24)
• rustc -Vv:

rustc 1.53.0-nightly (42816d61e 2021-04-24)
binary: rustc
commit-hash: 42816d61ead7e46d462df997958ccfd514f8c21c
commit-date: 2021-04-24
host: x86_64-unknown-linux-gnu
release: 1.53.0-nightly
LLVM version: 12.0.0

Error output

    Checking foo v0.1.0 (/tmp/tmp.Pk5eOrniDd/foo)
warning: struct is never constructed: `Foo`
 --> src/lib.rs:5:8
  |
5 | struct Foo(BTreeMap<i32, i32>);
  |        ^^^
  |
  = note: `#[warn(dead_code)]` on by default

warning: associated function is never used: `new`
 --> src/lib.rs:7:8
  |
7 |     fn new() -> Self {
  |        ^^^

thread 'rustc' panicked at 'internal error: entered unreachable code', src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs:379:17
note: run with `RUST_BACKTRACE=1` environment variable to display 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-clippy/issues/new

note: Clippy version: clippy 0.1.53 (42816d6 2021-04-24)

query stack during panic:
#0 [analysis] running analysis passes on this crate
end of query stack
warning: 2 warnings emitted

error: could not compile `foo`

To learn more, run the command again with --verbose.

Backtrace

  Checking foo v0.1.0 (/tmp/tmp.Pk5eOrniDd/foo)
warning: struct is never constructed: `Foo`
--> src/lib.rs:5:8
|
5 | struct Foo(BTreeMap<i32, i32>);
|        ^^^
|
= note: `#[warn(dead_code)]` on by default

warning: associated function is never used: `new`
--> src/lib.rs:7:8
|
7 |     fn new() -> Self {
|        ^^^

thread 'rustc' panicked at 'internal error: entered unreachable code', src/tools/clippy/clippy_utils/src/qualify_min_const_fn.rs:379:17
stack backtrace:
 0: rust_begin_unwind
           at /rustc/42816d61ead7e46d462df997958ccfd514f8c21c/library/std/src/panicking.rs:493:5
 1: core::panicking::panic_fmt
           at /rustc/42816d61ead7e46d462df997958ccfd514f8c21c/library/core/src/panicking.rs:92:14
 2: core::panicking::panic
           at /rustc/42816d61ead7e46d462df997958ccfd514f8c21c/library/core/src/panicking.rs:50:5
 3: clippy_utils::qualify_min_const_fn::is_min_const_fn
 4: <clippy_lints::missing_const_for_fn::MissingConstForFn as rustc_lint::passes::LateLintPass>::check_fn
 5: <rustc_lint::late::LateLintPassObjects as rustc_lint::passes::LateLintPass>::check_fn
 6: <rustc_lint::late::LateContextAndPass<T> as rustc_hir::intravisit::Visitor>::visit_fn
 7: rustc_hir::intravisit::walk_impl_item
 8: rustc_hir::intravisit::Visitor::visit_nested_impl_item
 9: rustc_hir::intravisit::walk_impl_item_ref
10: rustc_hir::intravisit::walk_item
11: rustc_hir::intravisit::Visitor::visit_nested_item
12: rustc_hir::intravisit::walk_mod
13: <rustc_lint::late::LateContextAndPass<T> as rustc_hir::intravisit::Visitor>::visit_mod
14: rustc_hir::intravisit::walk_crate
15: rustc_lint::late::late_lint_pass_crate
16: rustc_lint::late::late_lint_crate
17: rustc_session::utils::<impl rustc_session::session::Session>::time
18: std::panic::catch_unwind
19: rustc_session::utils::<impl rustc_session::session::Session>::time
20: rustc_interface::passes::analysis
21: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
22: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
23: rustc_data_structures::stack::ensure_sufficient_stack
24: rustc_query_system::query::plumbing::force_query_with_job
25: rustc_query_system::query::plumbing::get_query_impl
26: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
27: rustc_interface::passes::QueryContext::enter
28: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
29: rustc_span::with_source_map
30: rustc_interface::interface::create_compiler_and_run
31: scoped_tls::ScopedKey<T>::set
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-clippy/issues/new

note: Clippy version: clippy 0.1.53 (42816d6 2021-04-24)

query stack during panic:
#0 [analysis] running analysis passes on this crate
end of query stack
warning: 2 warnings emitted

error: could not compile `foo`

To learn more, run the command again with --verbose.