Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

quad-ICE with impl Trait in binding #67166

rodrimati1992 opened this issue Dec 8, 2019 · 0 comments

quad-ICE with impl Trait in binding #67166

rodrimati1992 opened this issue Dec 8, 2019 · 0 comments


Copy link

@rodrimati1992 rodrimati1992 commented Dec 8, 2019

With this code:


fn run(){
    let _foo: Box<impl Copy + '_> = Box::new(());

Running it in the playground (with Rust nightly 2019-12-07) it outputs these errors:

warning: the feature `impl_trait_in_bindings` is incomplete and may cause the compiler to crash
 --> src/
1 | #![feature(impl_trait_in_bindings)]
  |            ^^^^^^^^^^^^^^^^^^^^^^
  = note: `#[warn(incomplete_features)]` on by default

error: internal compiler error: `opaque_defn` is a local value
 --> src/
4 |   fn run(){
  |  _________^
5 | |     let _foo: Box<impl Copy + '_> = Box::new(());
6 | | }
  | |_^

error: internal compiler error: owner DefId(0:3 ~ playground[14f1]::run[0]) has no opaque type for DefId(0:4 ~ playground[14f1]::run[0]::{{opaque}}[0]) in its tables

error: internal compiler error: broken MIR in DefId(0:3 ~ playground[14f1]::run[0]) (Terminator { source_info: SourceInfo { span: src/ 5:49, scope: scope[0] }, kind: _1 = const std::boxed::Box::<()>::new(move _2) -> [return: bb2, unwind: bb1] }): call dest mismatch (std::boxed::Box<impl std::marker::Copy> <- std::boxed::Box<()>): NoSolution
 --> src/
5 |     let _foo: Box<impl Copy + '_> = Box::new(());
  |                                              ^^

thread 'rustc' panicked at 'no errors encountered even though `delay_span_bug` issued', src/librustc_errors/
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:

note: rustc 1.41.0-nightly (5c5c8eb86 2019-12-07) running on x86_64-unknown-linux-gnu

note: compiler flags: -C opt-level=3 -C codegen-units=1 --crate-type lib

note: some of the compiler flags provided by cargo are hidden

error: could not compile `playground`.

To learn more, run the command again with --verbose.
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
None yet
4 participants
You can’t perform that action at this time.