internal compiler error: librustc_trans/mir/block.rs:638

[glandium]

error: internal compiler error: librustc_trans/mir/block.rs:638: trans_argument: OperandRef(Immediate(({ [0 x i8]*, i64 }:{ [0 x i8]*, i64 } undef)) @ TyLayout { ty: &[u8], details: LayoutDetails { variants: Single { index: 0 }, fields: Arbitrary { offsets: [Size { raw: 0 }, Size { raw: 8 }], memory_index: [0, 1] }, abi: ScalarPair(Scalar { value: Pointer, valid_range: 1..=18446744073709551615 }, Scalar { value: Int(I64, false), valid_range: 0..=18446744073709551615 }), align: Align { abi: 3, pref: 3 }, size: Size { raw: 16 } } }) invalid for pair arugment

thread 'rustc' panicked at 'Box<Any>', librustc_errors/lib.rs:535:9
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
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
   2: std::panicking::default_hook::{{closure}}
             at libstd/sys_common/backtrace.rs:59
             at libstd/panicking.rs:207
   3: std::panicking::default_hook
             at libstd/panicking.rs:223
   4: core::ops::function::Fn::call
   5: std::panicking::rust_panic_with_hook
             at libstd/panicking.rs:403
   6: std::panicking::begin_panic
   7: rustc_errors::Handler::bug
   8: rustc::session::opt_span_bug_fmt::{{closure}}
   9: rustc::ty::context::tls::with_opt::{{closure}}
  10: <std::thread::local::LocalKey<T>>::try_with
  11: <std::thread::local::LocalKey<T>>::with
  12: rustc::ty::context::tls::with
  13: rustc::ty::context::tls::with_opt
  14: rustc::session::opt_span_bug_fmt
  15: rustc::session::bug_fmt
  16: rustc_trans::mir::block::<impl rustc_trans::mir::FunctionCx<'a, 'tcx>>::trans_argument
  17: rustc_trans::mir::block::<impl rustc_trans::mir::FunctionCx<'a, 'tcx>>::trans_terminator
  18: rustc_trans::mir::trans_mir
  19: rustc_trans::base::trans_instance
  20: rustc_trans::base::compile_codegen_unit
  21: rustc::dep_graph::graph::DepGraph::with_task_impl
  22: rustc::ty::maps::<impl rustc::ty::maps::queries::compile_codegen_unit<'tcx>>::force
  23: rustc::ty::maps::<impl rustc::ty::maps::queries::compile_codegen_unit<'tcx>>::try_get
  24: rustc::ty::maps::TyCtxtAt::compile_codegen_unit
  25: rustc::ty::maps::<impl rustc::ty::context::TyCtxt<'a, 'tcx, 'lcx>>::compile_codegen_unit
  26: rustc_trans::base::trans_crate
  27: <rustc_trans::LlvmTransCrate as rustc_trans_utils::trans_crate::TransCrate>::trans_crate
  28: rustc_driver::driver::phase_4_translate_to_llvm
  29: rustc_driver::driver::compile_input::{{closure}}
  30: rustc::ty::context::TyCtxt::create_and_enter
  31: rustc_driver::driver::compile_input
  32: rustc_driver::run_compiler

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 1.26.0-nightly (2789b067d 2018-03-06) running on x86_64-unknown-linux-gnu

note: compiler flags: -C opt-level=3 -C panic=abort --crate-type lib

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

I could reproduce with 1.24.1 too. This only happens when compiling with --release. I'm committing the state of my code that produces this locally so that I can find it if necessary. In that case, I'll try to come up with a reduced test case.

[glandium]

Duplicate of #46730