Closed
Description
The following ICE's:
#![feature(generic_associated_types)]
trait Fun {
type F<'a>: ?Sized;
fn identity<'a>(t: &'a Self::F<'a>) -> &'a Self::F<'a> { t }
}
impl <T> Fun for T {
type F<'a> = Self;
}
fn bug<'a, T: Fun<F = dyn Sync + Send>>(_: T) -> Box<T::F<'a>> {
Box::new(T::identity(&()))
}
fn main() {
let x = 10;
bug(x);
}Backtrace:
error: internal compiler error: src/librustc_codegen_ssa/mir/block.rs:886: codegen_argument: OperandRef(Immediate((i32*: %7 = invoke align 4 dereferenceable(4) i32* @_ZN10playground3Fun8identity17h312f2af0fa5c794fE(i32* noalias readonly align 4 dereferenceable(4) %6)
to label %9 unwind label %13)) @ TyLayout { ty: &i32, details: LayoutDetails { variants: Single { index: 0 }, fields: Union(0), abi: Scalar(Scalar { value: Pointer, valid_range: 1..=18446744073709551615 }), largest_niche: Some(Niche { offset: Size { raw: 0 }, scalar: Scalar { value: Pointer, valid_range: 1..=18446744073709551615 } }), align: AbiAndPrefAlign { abi: Align { pow2: 3 }, pref: Align { pow2: 3 } }, size: Size { raw: 8 } } }) invalid for pair argument
thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:883:9
stack backtrace:
0: backtrace::backtrace::libunwind::trace
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/libunwind.rs:88
1: backtrace::backtrace::trace_unsynchronized
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/mod.rs:66
2: std::sys_common::backtrace::_print_fmt
at src/libstd/sys_common/backtrace.rs:77
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:1052
5: std::io::Write::write_fmt
at src/libstd/io/mod.rs:1426
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:204
9: std::panicking::default_hook
at src/libstd/panicking.rs:224
10: rustc_driver::report_ice
11: std::panicking::rust_panic_with_hook
at src/libstd/panicking.rs:476
12: std::panicking::begin_panic
13: rustc_errors::HandlerInner::bug
14: rustc_errors::Handler::bug
15: rustc::util::bug::opt_span_bug_fmt::{{closure}}
16: rustc::ty::context::tls::with_opt::{{closure}}
17: rustc::ty::context::tls::with_opt
18: rustc::util::bug::opt_span_bug_fmt
19: rustc::util::bug::bug_fmt
20: rustc_codegen_ssa::mir::block::<impl rustc_codegen_ssa::mir::FunctionCx<Bx>>::codegen_argument
21: rustc_codegen_ssa::mir::block::<impl rustc_codegen_ssa::mir::FunctionCx<Bx>>::codegen_terminator
22: rustc_codegen_ssa::mir::codegen_mir
23: <rustc::mir::mono::MonoItem as rustc_codegen_ssa::mono_item::MonoItemExt>::define
24: rustc_codegen_llvm::base::compile_codegen_unit::module_codegen
25: rustc::dep_graph::graph::DepGraph::with_task
26: rustc_codegen_llvm::base::compile_codegen_unit
27: rustc_codegen_ssa::base::codegen_crate
28: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_utils::codegen_backend::CodegenBackend>::codegen_crate
29: rustc_session::utils::<impl rustc_session::session::Session>::time
30: rustc_interface::passes::QueryContext::enter
31: rustc_interface::queries::Queries::ongoing_codegen
32: rustc_interface::interface::run_compiler_in_existing_thread_pool
33: scoped_tls::ScopedKey<T>::set
34: syntax::with_globals
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
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 1.42.0-nightly (3761dcd34 2020-01-28) running on x86_64-unknown-linux-gnu
note: compiler flags: -C opt-level=3 -C codegen-units=1 --crate-type bin
note: some of the compiler flags provided by cargo are hidden
query stack during panic:
end of query stack
error: aborting due to previous error
error: could not compile `playground`.
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Category: This is a bug.`#![feature(generic_associated_types)]` a.k.a. GATsIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Relevant to the compiler team, which will review and decide on the PR/issue.ICE tracked in rust-lang/glacier.This issue requires a nightly compiler in some way.