Variadic functions are unstable

[P-E-P]

Variadic functions are unstable and the compiler should emit an appropriate error.

I tried this code:

pub fn toto(a: i32, ...) {}

fn main() {}

I expected to see this happen:

error: only foreign or `unsafe extern "C"` functions may be C-variadic
 --> src/lib.rs:1:21
  |
1 | pub fn toto(a :i32, ...) {
  |                     ^^^

error[E0658]: C-variadic functions are unstable
 --> src/lib.rs:1:1
  |
1 | / pub fn toto(a :i32, ...) {
2 | |     
3 | | }
  | |_^
  |
  = note: see issue #44930 <https://github.com/rust-lang/rust/issues/44930> for more information

Instead, this happened:

ICE

Details

crab1: internal compiler error: in get_pattern, at rust/ast/rust-item.h:611
0x1235da6 Rust::AST::FunctionParam::get_pattern()
../../gcc/rust/ast/rust-item.h:611
0x131e6f0 Rust::CfgStrip::maybe_strip_function_params(std::vector<Rust::AST::FunctionParam, std::allocatorRust::AST::FunctionParam >&)
/home/patryp/Documents/gccrs/build/gcc/../../gcc/rust/expand/rust-cfg-strip.cc:236
0x1323344 Rust::CfgStrip::visit(Rust::AST::Function&)
/home/patryp/Documents/gccrs/build/gcc/../../gcc/rust/expand/rust-cfg-strip.cc:2081
0x113afa0 Rust::AST::Function::accept_vis(Rust::AST::ASTVisitor&)
/home/patryp/Documents/gccrs/build/gcc/../../gcc/rust/ast/rust-ast.cc:4757
0x131e342 Rust::CfgStrip::go(Rust::AST::Crate&)
/home/patryp/Documents/gccrs/build/gcc/../../gcc/rust/expand/rust-cfg-strip.cc:153
0x1265978 Rust::Session::expansion(Rust::AST::Crate&)
/home/patryp/Documents/gccrs/build/gcc/../../gcc/rust/rust-session-manager.cc:879
0x1264535 Rust::Session::compile_crate(char const*)
/home/patryp/Documents/gccrs/build/gcc/../../gcc/rust/rust-session-manager.cc:588
0x1263f84 Rust::Session::handle_input_files(int, char const**)
/home/patryp/Documents/gccrs/build/gcc/../../gcc/rust/rust-session-manager.cc:402
0x10d8172 grs_langhook_parse_file()
/home/patryp/Documents/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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