Closed
Description
Code
enum E {
S(u8),
}
fn main() {
let x = E::S(0);
|| {
let E::S(_x) = x;
};
}Notes:
- Replacing
_xwith_fixes the problem - Removing the closure fixes the problem
Meta
rustc --version --verbose:
rustc 1.62.0-nightly (52ca603da 2022-04-12)
binary: rustc
commit-hash: 52ca603da73ae9eaddf96f77953b33ad8c47cc8e
commit-date: 2022-04-12
host: x86_64-apple-darwin
release: 1.62.0-nightly
LLVM version: 14.0.0
Error output
~/tmp/rust-ice $ cargo build
Compiling rust-ice v0.0.0 (/Users/malte/tmp/rust-ice)
warning: unused closure that must be used
--> src/main.rs:7:5
|
7 | / || {
8 | | let E::S(_x) = x;
9 | | };
| |______^
|
= note: `#[warn(unused_must_use)]` on by default
= note: closures are lazy and do nothing unless called
warning: Error finalizing incremental compilation session directory `/Users/malte/tmp/rust-ice/target/debug/incremental/rust_ice-y91kwbgiinrt/s-g92x6q1o4k-6235wp-working`: No such file or directory (os error 2)
error: internal compiler error: no errors encountered even though `delay_span_bug` issued
error: internal compiler error: broken MIR in DefId(0:8 ~ rust_ice[3e90]::main::{closure#0}) (((*((*_1).0: &u8)).0: u8)): can't project out of PlaceTy { ty: u8, variant_index: None }
--> src/main.rs:8:18
|
8 | let E::S(_x) = x;
| ^^
|
= note: delayed at compiler/rustc_borrowck/src/type_check/mod.rs:860:31
error: internal compiler error: TyKind::Error constructed but no error reported
|
= note: delayed at compiler/rustc_borrowck/src/type_check/mod.rs:795:20
error: internal compiler error: TyKind::Error constructed but no error reported
|
= note: delayed at /rustc/4ca19e09d302a4cbde14f9cb1bc109179dc824cd/compiler/rustc_middle/src/ty/relate.rs:419:59
error: internal compiler error: broken MIR in DefId(0:7 ~ rust_ice[3e90]::main) ((_1.0: u8)): can't project out of PlaceTy { ty: E, variant_index: None }
--> src/main.rs:7:5
|
7 | / || {
8 | | let E::S(_x) = x;
9 | | };
| |_____^
|
= note: delayed at compiler/rustc_borrowck/src/type_check/mod.rs:860:31
thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1346:13
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
note: the compiler unexpectedly panicked. this is a bug.
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 1.62.0-nightly (4ca19e09d 2022-04-19) running on x86_64-apple-darwin
note: compiler flags: --crate-type bin -C embed-bitcode=no -C split-debuginfo=unpacked -C debuginfo=2 -C incremental
note: some of the compiler flags provided by cargo are hidden
query stack during panic:
end of query stack
warning: `rust-ice` (bin "rust-ice") generated 2 warnings
error: could not compile `rust-ice`; 2 warnings emitted
Backtrace
thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1346:13
stack backtrace:
0: std::panicking::begin_panic::<rustc_errors::ExplicitBug>
1: std::panic::panic_any::<rustc_errors::ExplicitBug>
2: <rustc_errors::HandlerInner as core::ops::drop::Drop>::drop
3: core::ptr::drop_in_place::<rustc_session::parse::ParseSess>
4: <alloc::rc::Rc<rustc_session::session::Session> as core::ops::drop::Drop>::drop
5: core::ptr::drop_in_place::<rustc_interface::interface::Compiler>
6: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_interface::interface::create_compiler_and_run<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver::run_compiler::{closure#1}>::{closure#1}>
7: rustc_interface::interface::create_compiler_and_run::<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver::run_compiler::{closure#1}>
8: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.