rustc error: internal compiler error: type_of with ty_param

[carllerche]

output:

rustc --staticlib -Z gen-crate-map -o libskylight.a src/rs/skylight/lib.rs
warning: ignoring specified output filename for library.
src/rs/skylight/api.rs:75:75: 75:78 warning: unused variable: `obj`, #[warn(unused_variable)] on by default
src/rs/skylight/api.rs:75 pub extern "C" fn sk_message_serialized_size_info<M: proto::Serializable>(obj: &M) -> *proto::SerializedSizeInfo {
                                                                                                    ^~~
src/rs/skylight/proto/api.rs:38:1: 43:2 warning: code is never used: `deserialize_from_bytes`, #[warn(dead_code)] on by default
src/rs/skylight/proto/api.rs:38 pub fn deserialize_from_bytes<T: Deserializable>(bytes: &[u8]) -> Result<T, int> {
src/rs/skylight/proto/api.rs:39   let mut reader = BufReader::new(bytes);
src/rs/skylight/proto/api.rs:40   let mut stream = InputStream::new(&mut reader);
src/rs/skylight/proto/api.rs:41
src/rs/skylight/proto/api.rs:42   Deserializable::deserialize(&mut stream)
src/rs/skylight/proto/api.rs:43 }
error: internal compiler error: type_of with ty_param
This message reflects a bug in the Rust compiler.
We would appreciate a bug report: http://static.rust-lang.org/doc/master/complement-bugreport.html
task 'rustc' failed at 'explicit failure', /Users/carllerche/Code/oss/rust/src/libsyntax/diagnostic.rs:75
task '<main>' failed at 'explicit failure', /Users/carllerche/Code/oss/rust/src/librustc/lib.rs:448

uname -a:

Darwin Carls-MacBook-Pro.local 12.5.0 Darwin Kernel Version 12.5.0: Sun Sep 29 13:33:47 PDT 2013; root:xnu-2050.48.12~1/RELEASE_X86_64 x86_64

rustc -v:

rustc 0.10-pre (f4498c7 2014-01-17 17:56:41 -0800)
host: x86_64-apple-darwin

backtrace:

#0  0x00000001000aa490 in rust_fail ()
#1  0x00000001000087d7 in rt::unwind::Unwinder::begin_unwind::h404ae94160912110NCaL::v0.9 ()
#2  0x00000001009fc240 in rt::unwind::begin_unwind::h7661869d5c05f669aH::v0.10.pre ()
#3  0x0000000100a0b49c in diagnostic::Handler::fatal::h43d803f113302b80qVam::v0.10.pre ()
#4  0x0000000100a0bb79 in diagnostic::Handler::bug::h8095feb2c3679cf5qVaB::v0.10.pre ()
#5  0x0000000100f9fd54 in driver::session::Session_::bug::hcd85f36ce5a8ae05iqak::v0.10.pre ()
#6  0x0000000100fdee4c in middle::trans::type_of::type_of::h84f1da6e53fff97fak::v0.10.pre ()
#7  0x0000000100fde58d in middle::trans::type_of::type_of::h84f1da6e53fff97fak::v0.10.pre ()
#8  0x0000000100fde16f in middle::trans::type_of::type_of::h84f1da6e53fff97fak::v0.10.pre ()
#9  0x0000000101049c72 in vec::ImmutableVector$$BP$$VEC$T::map::h520a9f201eefee5alaaS::v0.10.pre ()
#10 0x00000001010e09d3 in middle::trans::foreign::foreign_signature::h9a66760111f3aafcaj::v0.10.pre ()
#11 0x00000001010e0ca2 in middle::trans::foreign::foreign_types_for_fn_ty::h739a71597f0d8754ax::v0.10.pre ()
#12 0x00000001010a6566 in middle::trans::foreign::register_rust_fn_with_foreign_abi::h25dbdc53f0369707ac::v0.10.pre ()
#13 0x0000000100f9d75d in middle::trans::base::get_item_val::hc7fc1be88631c8f2a7::v0.10.pre ()
#14 0x0000000100f9b1ba in middle::trans::base::trans_item::hcc7696c7806da52eaZ::v0.10.pre ()
#15 0x00000001010a2ddf in middle::trans::base::trans_mod::h0cb3aa9e0f3df697aG::v0.10.pre ()
#16 0x0000000100f9af27 in middle::trans::base::trans_item::hcc7696c7806da52eaZ::v0.10.pre ()
#17 0x00000001010a2ddf in middle::trans::base::trans_mod::h0cb3aa9e0f3df697aG::v0.10.pre ()
#18 0x00000001010abf55 in middle::trans::base::trans_crate::h3778a50aab1ab774aw::v0.10.pre ()
#19 0x00000001015bacfc in driver::driver::phase_4_translate_to_llvm::heb67e681f938484aaQ::v0.10.pre ()
#20 0x00000001015bdb90 in driver::driver::compile_input::hf02f7b912014724aaq::v0.10.pre ()
#21 0x00000001015e3906 in run_compiler::h774565e05568b767aS::v0.10.pre ()
#22 0x00000001015f1a26 in main_args::anon::expr_fn::as ()
#23 0x00000001015efb94 in monitor::anon::expr_fn::aL ()
#24 0x00000001015e8b9e in task::TaskBuilder::try::anon::expr_fn::sIaOao ()
#25 0x00000001005c0428 in task::__extensions__::build_start_wrapper::anon::anon::expr_fn::a7 ()
#26 0x00000001000a5f68 in rt::task::__extensions__::run::anon::expr_fn::ag ()
#27 0x00000001000acebc in rust_try ()
#28 0x00000001005bfebc in task::__extensions__::build_start_wrapper::anon::expr_fn::aR ()

[carllerche]

I believe that the error happened because of this:

#[no_mangle]
pub extern "C" fn sk_message_serialized_size_info<M: proto::Serializable>(obj: &M) -> *proto::SerializedSizeInfo {
  let ret = proto::compute_serialized_size_of(obj);
  unsafe { cast::transmute(ret) }
}

[alexcrichton]

Closing as a dupe of #10954, generics aren't allowed in extern fns and I don't think that they're handled perfectly just yet.