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ICE on casting unsized tuple struct constructors. #50940
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I get this backtrace:
$ RUST_BACKTRACE=1 cargo +nightly build Compiling rust50940 v0.1.0 (file:///tmp/rust50940) thread 'main' panicked at 'unsupported integer: Reg { kind: Integer, size: Size { raw: 0 } }', librustc_target/abi/call/mod.rs:147:26 stack backtrace: 0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49 1: std::sys_common::backtrace::print at libstd/sys_common/backtrace.rs:71 at libstd/sys_common/backtrace.rs:59 2: std::panicking::default_hook::{{closure}} at libstd/panicking.rs:211 3: std::panicking::default_hook at libstd/panicking.rs:227 4: rustc::util::common::panic_hook 5: std::panicking::rust_panic_with_hook at libstd/panicking.rs:467 6: std::panicking::begin_panic_fmt at libstd/panicking.rs:350 7: rustc_target::abi::call::Reg::align 8: <rustc_target::abi::call::ArgType<'tcx, &'tcx rustc::ty::TyS<'tcx>> as rustc_codegen_llvm::abi::ArgTypeExt<'a, 'tcx>>::store 9: <rustc_target::abi::call::ArgType<'tcx, &'tcx rustc::ty::TyS<'tcx>> as rustc_codegen_llvm::abi::ArgTypeExt<'a, 'tcx>>::store_fn_arg 10: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &'a mut F>::call_once 11: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::from_iter 12: rustc_codegen_llvm::mir::codegen_mir 13: rustc_codegen_llvm::base::codegen_instance 14: rustc_codegen_llvm::mono_item::MonoItemExt::define 15: rustc_codegen_llvm::base::compile_codegen_unit 16: rustc::ty::maps::<impl rustc::ty::maps::config::QueryConfig<'tcx> for rustc::ty::maps::queries::compile_codegen_unit<'tcx>>::compute 17: rustc::ty::context::tls::with_context 18: rustc::dep_graph::graph::DepGraph::with_task_impl 19: rustc::ty::context::tls::with_related_context 20: rustc::ty::maps::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::force_query_with_job 21: rustc::ty::maps::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::get_query 22: rustc::ty::maps::<impl rustc::ty::context::TyCtxt<'a, 'tcx, 'lcx>>::compile_codegen_unit 23: rustc_codegen_llvm::base::codegen_crate 24: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_utils::codegen_backend::CodegenBackend>::codegen_crate 25: rustc::util::common::time 26: rustc_driver::driver::phase_4_codegen 27: rustc_driver::driver::compile_input::{{closure}} 28: rustc::ty::context::tls::enter_context 29: <std::thread::local::LocalKey<T>>::with 30: rustc::ty::context::TyCtxt::create_and_enter 31: rustc_driver::driver::compile_input 32: rustc_driver::run_compiler_with_pool 33: syntax::with_globals 34: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once 35: __rust_maybe_catch_panic at libpanic_unwind/lib.rs:105 36: rustc_driver::run 37: rustc_driver::main 38: std::rt::lang_start::{{closure}} 39: std::panicking::try::do_call at libstd/rt.rs:59 at libstd/panicking.rs:310 40: __rust_maybe_catch_panic at libpanic_unwind/lib.rs:105 41: std::rt::lang_start_internal at libstd/panicking.rs:289 at libstd/panic.rs:374 at libstd/rt.rs:58 42: main 43: __libc_start_main 44: <unknown> query stack during panic: #0 [compile_codegen_unit] compile_codegen_unit end of query stack 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 1.28.0-nightly (a1d4a9503 2018-05-20) running on x86_64-unknown-linux-gnu note: compiler flags: -C debuginfo=2 -C incremental --crate-type bin note: some of the compiler flags provided by cargo are hidden error: Could not compile `rust50940`. To learn more, run the command again with --verbose.FWIW if llvm assertions are enabled the following assertion is hit. I'll start looking into this when I get some free cycles.
rustc: /home/drobertson/git/rust/src/llvm/lib/IR/Type.cpp:241: static llvm::IntegerType* llvm::IntegerType::get(llvm::LLVMContext&, unsigned int): Assertion `NumBits >= MIN_INT_BITS && "bitwidth too small"' failed.I think this issue can be closed.
The following code causes ICE. playground
Stable
Nightly