ICE: Can't to use a reference of a type that implements Allocator as an allocator.

[lilasta]

Code

Playground

#![feature(allocator_api)]

use std::alloc::{AllocError, Allocator, Layout, System};
use std::ptr::NonNull;
use std::boxed::Box;

struct Alloc;

unsafe impl Allocator for Alloc {
    fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError> {
        System.allocate(layout)
    }

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

fn main() {
    let alloc = Alloc;
    let boxed = Box::new_in(10, alloc.by_ref());
}

Meta

rustc --version --verbose:

rustc 1.59.0-nightly (475b00aa4 2021-12-24)
binary: rustc
commit-hash: 475b00aa4037461b506539a06d15ca6091b461a7
commit-date: 2021-12-24
host: x86_64-unknown-linux-gnu
release: 1.59.0-nightly
LLVM version: 13.0.0

Error output

thread 'rustc' panicked at 'assertion failed: i < this.fields.count()', /rustc/c09a9529c51cde41c1101e56049d418edb07bf71/compiler/rustc_middle/src/ty/layout.rs:2311:21
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: internal compiler error: unexpected panic

Backtrace

stack backtrace:
   0: rust_begin_unwind
             at /rustc/c09a9529c51cde41c1101e56049d418edb07bf71/library/std/src/panicking.rs:498:5
   1: core::panicking::panic_fmt
             at /rustc/c09a9529c51cde41c1101e56049d418edb07bf71/library/core/src/panicking.rs:107:14
   2: core::panicking::panic
             at /rustc/c09a9529c51cde41c1101e56049d418edb07bf71/library/core/src/panicking.rs:48:5
   3: <&rustc_middle::ty::TyS as rustc_target::abi::TyAbiInterface<_>>::ty_and_layout_field::field_ty_or_layout::<rustc_codegen_llvm::context::CodegenCx>
   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::TyAndLayout<&rustc_middle::ty::TyS> as rustc_codegen_llvm::type_of::LayoutLlvmExt>::llvm_type
   7: <rustc_target::abi::TyAndLayout<&rustc_middle::ty::TyS> as rustc_codegen_llvm::type_of::LayoutLlvmExt>::llvm_type
   8: <rustc_target::abi::call::FnAbi<&rustc_middle::ty::TyS> as rustc_codegen_llvm::abi::FnAbiLlvmExt>::llvm_type
   9: <rustc_codegen_llvm::context::CodegenCx as rustc_codegen_ssa::traits::declare::PreDefineMethods>::predefine_fn
  10: rustc_codegen_llvm::base::compile_codegen_unit::module_codegen
  11: <rustc_query_system::dep_graph::graph::DepGraph<rustc_middle::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle::ty::context::TyCtxt, rustc_span::symbol::Symbol, rustc_codegen_ssa::ModuleCodegen<rustc_codegen_llvm::ModuleLlvm>>
  12: rustc_codegen_llvm::base::compile_codegen_unit
  13: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate
  14: <rustc_session::session::Session>::time::<alloc::boxed::Box<dyn core::any::Any>, rustc_interface::passes::start_codegen::{closure#0}>
  15: <rustc_interface::queries::Queries>::ongoing_codegen
  16: <rustc_interface::interface::Compiler>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorReported>>
  17: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorReported>, rustc_interface::interface::create_compiler_and_run<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#1}>
  18: rustc_interface::interface::create_compiler_and_run::<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>
  19: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorReported>, rustc_driver::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_errors::ErrorReported>>

[lilasta]

Oh, this issue is a duplicate of #90201 #78459