Closed
Description
The following code produces an ICE:
#![feature(generic_associated_types)]
trait Fun {
type F<'a>: Fn() -> u32;
fn callme<'a>(f: Self::F<'a>) -> u32 {
f()
}
}
impl <T> Fun for T {
type F<'a> = Self;
}
fn main() {
<fn()>::callme(|| {});
}Backtrace:
Compiling playground v0.0.1 (/playground)
warning: the feature `generic_associated_types` is incomplete and may cause the compiler to crash
--> src/main.rs:1:12
|
1 | #![feature(generic_associated_types)]
| ^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: `#[warn(incomplete_features)]` on by default
error: internal compiler error: src/librustc_codegen_ssa/mir/operand.rs:403: use of PlaceRef { local: _0, projection: [] } before def
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::operand::<impl rustc_codegen_ssa::mir::FunctionCx<Bx>>::codegen_consume
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 codegen-units=1 -C debuginfo=2 --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`.
To learn more, run the command again with --verbose.
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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.