Cannot derive both Clone and Copy on an empty struct

[CohenArthur]

I tried this code:

#[lang = "copy"]
trait Copy {}

#[lang = "clone"]
trait Clone {
    fn clone(&self) -> Self;
}

#[derive(Copy, Clone)]
struct Empty;

I expected to see this happen: no error.

Instead, this happened:

crab1: internal compiler error: in go, at rust/expand/rust-derive-clone.cc:106
0x23e9f13 Rust::AST::DeriveClone::go(Rust::AST::Item&)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/expand/rust-derive-clone.cc:106
0x23e870c Rust::AST::DeriveVisitor::derive(Rust::AST::Item&, Rust::AST::Attribute const&, Rust::BuiltinMacro)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/expand/rust-derive.cc:37
0x23daaed Rust::builtin_derive_item(Rust::AST::Item&, Rust::AST::Attribute const&, Rust::BuiltinMacro)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/expand/rust-expand-visitor.cc:49
0x23da6cd Rust::ExpandVisitor::expand_inner_items(std::vector<std::unique_ptr<Rust::AST::Item, std::default_delete<Rust::AST::Item> >, std::allocator<std::unique_ptr<Rust::AST::Item, std::default_delete<Rust::AST::Item> > > >&)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/expand/rust-expand-visitor.cc:192
0x23dbf80 Rust::ExpandVisitor::visit(Rust::AST::Crate&)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/expand/rust-expand-visitor.cc:443
0x23d9ff0 Rust::ExpandVisitor::go(Rust::AST::Crate&)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/expand/rust-expand-visitor.cc:42
0x22ec683 Rust::Session::expansion(Rust::AST::Crate&, Rust::Resolver2_0::NameResolutionContext&)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/rust-session-manager.cc:933
0x22eaf0f Rust::Session::compile_crate(char const*)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/rust-session-manager.cc:604
0x22ea8b1 Rust::Session::handle_input_files(int, char const**)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/rust-session-manager.cc:416
0x2144872 grs_langhook_parse_file()
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/rust-lang.cc:165
Please submit a full bug report, with preprocessed source (by using -freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

if the order of Clone and Copy is switched, then this happens:

crab1: internal compiler error: in go, at rust/expand/rust-derive-copy.cc:34
0x23eb6a3 Rust::AST::DeriveCopy::go(Rust::AST::Item&)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/expand/rust-derive-copy.cc:34
0x23e873f Rust::AST::DeriveVisitor::derive(Rust::AST::Item&, Rust::AST::Attribute const&, Rust::BuiltinMacro)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/expand/rust-derive.cc:39
0x23daaed Rust::builtin_derive_item(Rust::AST::Item&, Rust::AST::Attribute const&, Rust::BuiltinMacro)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/expand/rust-expand-visitor.cc:49
0x23da6cd Rust::ExpandVisitor::expand_inner_items(std::vector<std::unique_ptr<Rust::AST::Item, std::default_delete<Rust::AST::Item> >, std::allocator<std::unique_ptr<Rust::AST::Item, std::default_delete<Rust::AST::Item> > > >&)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/expand/rust-expand-visitor.cc:192
0x23dbf80 Rust::ExpandVisitor::visit(Rust::AST::Crate&)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/expand/rust-expand-visitor.cc:443
0x23d9ff0 Rust::ExpandVisitor::go(Rust::AST::Crate&)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/expand/rust-expand-visitor.cc:42
0x22ec683 Rust::Session::expansion(Rust::AST::Crate&, Rust::Resolver2_0::NameResolutionContext&)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/rust-session-manager.cc:933
0x22eaf0f Rust::Session::compile_crate(char const*)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/rust-session-manager.cc:604
0x22ea8b1 Rust::Session::handle_input_files(int, char const**)
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/rust-session-manager.cc:416
0x2144872 grs_langhook_parse_file()
	/home/kagounard/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/rust-lang.cc:165
Please submit a full bug report, with preprocessed source (by using -freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

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