ICE with generic extern functions

[SiegeLord]

I am getting an ICE when trying to use a generic extern function (tested with the toolchain at a9247e0):

rust: task failed at 'assertion failed: !ty::type_has_params(t)', /home/siege/src/rust2/src/librustc/middle/trans/common.rs:1372

Sample code to trigger the error:

extern
fn RustCallback<T>()
{
    let t : T;
}

fn main()
{
}

Stacktrace:

/usr/local/bin/../lib/librustrt.so(_ZN9rust_task13begin_failureEPKcS1_m+0x4b)[0x7f85875f9c8b]
/usr/local/bin/../lib/librustrt.so(+0x2aa79)[0x7f858760aa79]
/usr/local/bin/../lib/librustrt.so(upcall_fail+0x1a8)[0x7f85875fba78]
/usr/local/bin/../lib/libcore-c3ca5d77d81b46c1-0.7-pre.so(+0x10911b)[0x7f85891cf11b]
/usr/local/bin/../lib/libcore-c3ca5d77d81b46c1-0.7-pre.so(+0x1090c2)[0x7f85891cf0c2]
/usr/local/bin/../lib/libcore-c3ca5d77d81b46c1-0.7-pre.so(_ZN3sys12begin_unwind17_61fe198059b9e3fc6_07preE+0x71)[0x7f8589115601]
/usr/local/bin/../lib/libcore-c3ca5d77d81b46c1-0.7-pre.so(_ZN3sys11fail_assert17_10b61817f19c764b6_07preE+0x21d)[0x7f858911ec8d]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6middle5trans6common17monomorphize_type17_17576497a9b53f186_07preE+0x1c9)[0x7f8587a62ca9]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6middle5trans6common12node_id_type17_c6b9ecdeff5b38ec6_07preE+0x79)[0x7f8587a2b689]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6middle5trans4base11alloc_local17_e51928963deee6fa6_07preE+0xb8)[0x7f85879a8778]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(+0x16c5e1)[0x7f85879a85e1]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(+0x2770d0)[0x7f8587ab30d0]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6middle5trans11controlflow11trans_block17_a07ed9488587816c6_07preE+0x12e)[0x7f85879a75ee]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6middle5trans4base13trans_closure16_e3ba18151419fb26_07preE+0x744)[0x7f8587ab9c24]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6middle5trans4base8trans_fn15_f3bb06a593a3536_07preE+0x536)[0x7f858795d6e6]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6middle5trans7foreign16trans_foreign_fn17_e229b3339a411ada6_07preE+0x2d4)[0x7f8587abf484]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6middle5trans4base10trans_item17_e83b64764568c7be6_07preE+0x810)[0x7f8587954c80]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6middle5trans4base9trans_mod17_d740d055c716f9476_07preE+0xa3)[0x7f8587ac03d3]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6middle5trans4base11trans_crate15_4f38ab124cab2e6_07preE+0x13c4)[0x7f8587ae03e4]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(+0x8ddce4)[0x7f8588119ce4]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(+0x89b8b0)[0x7f85880d78b0]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6driver6driver12compile_rest15_58068714615f2b6_07preE+0x336a)[0x7f85880d490a]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(+0x8ddce4)[0x7f8588119ce4]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6driver6driver12compile_upto17_3ccd839185751c4f6_07preE+0x108)[0x7f85880d7ac8]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN6driver6driver13compile_input17_7bc345e59d22cba06_07preE+0xca)[0x7f85880d7f0a]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(_ZN12run_compiler16_aa88c3dc13843746_07preE+0x20a0)[0x7f858810a720]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(+0x8db691)[0x7f8588117691]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(+0x8d7bba)[0x7f8588113bba]
/usr/local/bin/../lib/librustc-c84825241471686d-0.7-pre.so(+0x8ddce4)[0x7f8588119ce4]
/usr/local/bin/../lib/libcore-c3ca5d77d81b46c1-0.7-pre.so(+0xd0fbf)[0x7f8589196fbf]
/usr/local/bin/../lib/libcore-c3ca5d77d81b46c1-0.7-pre.so(+0x152264)[0x7f8589218264]
/usr/local/bin/../lib/librustrt.so(_Z18task_start_wrapperP10spawn_args+0x24)[0x7f85875fa4d4]

[jdm]

Same as #3171.