allocator bug

[gipsyh]

#![feature(allocator_api)]

struct A {
    a:u32
}
unsafe impl std::alloc::Allocator for A {
    fn allocate(
        &self,
        layout: std::alloc::Layout,
    ) -> Result<std::ptr::NonNull<[u8]>, std::alloc::AllocError> {
        Err(std::alloc::AllocError)
    }

    unsafe fn deallocate(&self, ptr: std::ptr::NonNull<u8>, layout: std::alloc::Layout) {}
}

fn main() {
    let a = A {a:1};
    Box::new_in(1, a);
}

thread 'rustc' panicked at 'assertion failed: i < this.fields.count()', /rustc/547a6ffee0cf4da9929a9e3d49546dc87d607735/compiler/rustc_middle/src/ty/layout.rs:2290:21
stack backtrace:
   0: rust_begin_unwind
             at /rustc/547a6ffee0cf4da9929a9e3d49546dc87d607735/library/std/src/panicking.rs:495:5
   1: core::panicking::panic_fmt
             at /rustc/547a6ffee0cf4da9929a9e3d49546dc87d607735/library/core/src/panicking.rs:107:14
   2: core::panicking::panic
             at /rustc/547a6ffee0cf4da9929a9e3d49546dc87d607735/library/core/src/panicking.rs:50:5
   3: rustc_middle::ty::layout::<impl rustc_target::abi::TyAbiInterface<C> for &rustc_middle::ty::TyS>::ty_and_layout_field::field_ty_or_layout
   4: <rustc_target::abi::TyAndLayout<&rustc_middle::ty::TyS> as rustc_codegen_llvm::type_of::LayoutLlvmExt>::scalar_pair_element_llvm_type
   5: <rustc_target::abi::TyAndLayout<&rustc_middle::ty::TyS> as rustc_codegen_llvm::type_of::LayoutLlvmExt>::scalar_pair_element_llvm_type
   6: <rustc_target::abi::call::FnAbi<&rustc_middle::ty::TyS> as rustc_codegen_llvm::abi::FnAbiLlvmExt>::llvm_type
   7: rustc_codegen_llvm::mono_item::<impl rustc_codegen_ssa::traits::declare::PreDefineMethods for rustc_codegen_llvm::context::CodegenCx>::predefine_fn
   8: rustc_codegen_llvm::base::compile_codegen_unit::module_codegen
   9: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task
  10: rustc_codegen_llvm::base::compile_codegen_unit
  11: rustc_codegen_ssa::base::codegen_crate
  12: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate
  13: rustc_session::utils::<impl rustc_session::session::Session>::time
  14: rustc_interface::queries::Queries::ongoing_codegen
  15: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  16: rustc_span::with_source_map
  17: scoped_tls::ScopedKey<T>::set
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/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.58.0-nightly (547a6ffee 2021-10-21) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type bin

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

[memoryruins]

Duplicate of #90201 and #78459

[matthiaskrgr]

This is fixed on nightly.