Closed
Description
The following ICE's:
#![feature(generic_associated_types)]
trait Fun {
type F<'a: 'a>;
}
impl <T> Fun for T {
type F<'a> = Self;
}
fn main() {
}
Backtrace:
error: internal compiler error: unelided lifetime in signature
--> src/main.rs:4:16
|
4 | type F<'a: 'a>;
| ^^
thread 'rustc' panicked at 'no errors encountered even though `delay_span_bug` issued', src/librustc_errors/lib.rs:357:17
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 as core::ops::drop::Drop>::drop
14: core::ptr::drop_in_place
15: <alloc::rc::Rc<T> as core::ops::drop::Drop>::drop
16: core::ptr::drop_in_place
17: rustc_interface::interface::run_compiler_in_existing_thread_pool
18: scoped_tls::ScopedKey<T>::set
19: syntax::with_globals
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/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: could not compile `playground`.
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Category: This is a bug.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.`#![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.