Issue 1:
The following code ICEs:

fn main() {
let r : &[int] = &[1,2,3];
let _ = r as *const [int] as uint;
}

with the following error:

error: internal compiler error: translating unsupported cast: *const [int] (cast_other) -> uint (cast_integral)
note: the compiler hit an unexpected failure path. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
task 'rustc' failed at 'Box<Any>', /tmp/tmp.AJuZnZc9G6/rust/src/libsyntax/ast_util.rs:776

stack backtrace:
1: 0x7fd831534e20 - rt::backtrace::imp::write::h05ad71e0d8d53545YFq
2: 0x7fd831537fe0 - failure::on_fail::h67318170e271381eq1q
3: 0x7fd831d0ef40 - unwind::begin_unwind_inner::hab98eb958c8dd037MTd
4: 0x7fd830019c20 - unwind::begin_unwind::h6101647644969584620
5: 0x7fd83001a3c0 - diagnostic::Handler::bug::h73bed1cade32a05dYID
6: 0x7fd832101800 - driver::session::Session::bug::haf0a22dbefd7a44bSmv
7: 0x7fd8325467d0 - middle::trans::expr::trans_imm_cast::h3be503504a2cb4d6iY2
8: 0x7fd832539140 - middle::trans::expr::trans_unadjusted::hd291a28db4ab1b64i50
9: 0x7fd8324f6380 - middle::trans::expr::trans::h4aa7a0f1f6a515f12o0
10: 0x7fd83259d640 - middle::trans::_match::store_local::h95ac038bd6a8824cjRf
11: 0x7fd8324f4310 - middle::trans::base::init_local::hcaa97d53d8042b21zyb
12: 0x7fd8324f3810 - middle::trans::controlflow::trans_stmt::h754badf284040952fjW
13: 0x7fd8324f51b0 - middle::trans::controlflow::trans_block::hd9fdbeb4ba696bd2boW
14: 0x7fd8325a6520 - middle::trans::base::trans_closure::h201746f506a92a56lpc
15: 0x7fd8324e4b50 - middle::trans::base::trans_fn::hfc81a7de00fc2ea6yAc
16: 0x7fd8324e01d0 - middle::trans::base::trans_item::h0854978c1c605151HTc
17: 0x7fd8325b2910 - middle::trans::base::trans_crate::haa777e4646f5d49aBRd
18: 0x7fd8329f3c80 - driver::driver::phase_4_translate_to_llvm::hee038ef8fdb7099bjOu
19: 0x7fd8329eb130 - driver::driver::compile_input::h411f5de1517db61bIpu
20: 0x7fd832a7f680 - driver::run_compiler::h918ca986269540e0iay
21: 0x7fd832a7f560 - driver::main_args::closure.148406
22: 0x7fd83212f540 - task::TaskBuilder<S>::try_future::closure.100321
23: 0x7fd83212f330 - task::TaskBuilder<S>::spawn_internal::closure.100292
24: 0x7fd8333eb720 - task::spawn_opts::closure.8416
25: 0x7fd831d6f930 - rust_try_inner
26: 0x7fd831d6f920 - rust_try
27: 0x7fd831d0c520 - unwind::try::ha98ecfc6c2b84277uId
28: 0x7fd831d0c380 - task::Task::run::hc9ce4f8671722f9bfYc
29: 0x7fd8333eb490 - task::spawn_opts::closure.8356
30: 0x7fd831d0df70 - thread::thread_start::h605925f5652c970frid
31: 0x7fd830ff6dc0 - start_thread
32: 0x0 - <unknown>

Issue 2:
Code:

fn f() -> u64 {
0
}

fn main() {
let n = f as f32;
}

Error with backtrace:

src/main.rs:6:9: 6:10 warning: unused variable: `n`, #[warn(unused_variable)] on by default
src/main.rs:6 let n = f as f32;
^
error: internal compiler error: translating unsupported cast: fn() -> u64 (cast_pointer) -> f32 (cast_float)
note: the compiler hit an unexpected failure path. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
task 'rustc' failed at 'Box<Any>', /home/rustbuild/src/rust-buildbot/slave/nightly-linux/build/src/libsyntax/diagnostic.rs:163

stack backtrace:
1: 0x7f6e5389ced0 - rt::backtrace::imp::write::h3e02102493c7a1b79Hp::v0.11.0.pre
2: 0x7f6e538a3a00 - failure::on_fail::h73803e3fd7728138o3p::v0.11.0.pre
3: 0x7f6e55a06ef0 - unwind::begin_unwind_inner::h66e3981eb8555b96cZd::v0.11.0.pre
4: 0x7f6e54e4a4e0 - unwind::begin_unwind::h14114372353668361027::v0.11.0.pre
5: 0x7f6e54e4ae80 - diagnostic::Handler::bug::h163e51ddd1a017c2Dgc::v0.11.0.pre
6: 0x7f6e562f9520 - driver::session::Session::bug::h09f59f7b6f35750fdsr::v0.11.0.pre
7: 0x7f6e5637cbf0 - middle::trans::expr::trans_imm_cast::h261d15fd2f6453feLQh::v0.11.0.pre
8: 0x7f6e5636e380 - middle::trans::expr::trans_unadjusted::h37391b28c8fd0d0b60f::v0.11.0.pre
9: 0x7f6e5632a310 - middle::trans::expr::trans_into::hdc05c03d27b262d4JDf::v0.11.0.pre
10: 0x7f6e56434000 - middle::trans::_match::store_local::closure.85655
11: 0x7f6e56433cf0 - middle::trans::_match::mk_binding_alloca::h16257314354832004452::v0.11.0.pre
12: 0x7f6e563eaa70 - middle::trans::_match::store_local::h71f3ff230e537ab6JEu::v0.11.0.pre
13: 0x7f6e563297e0 - middle::trans::base::init_local::he8478d5bef2cef9cOZp::v0.11.0.pre
14: 0x7f6e56328d40 - middle::trans::controlflow::trans_stmt::h77aa44239cd8a9d8Mdc::v0.11.0.pre
15: 0x7f6e5632a940 - middle::trans::controlflow::trans_block::hf4faa65f79a4fae52ic::v0.11.0.pre
16: 0x7f6e563f0850 - middle::trans::base::trans_closure::hbab3416264edbe7aauq::v0.11.0.pre
17: 0x7f6e562fa790 - middle::trans::base::trans_fn::hd7d1d11484c269ccbCq::v0.11.0.pre
18: 0x7f6e562f3230 - middle::trans::base::trans_item::h40a4f8eccf6f8e7eCSq::v0.11.0.pre
19: 0x7f6e564011b0 - middle::trans::base::trans_crate::h470bfcf3cac093e1JMr::v0.11.0.pre
20: 0x7f6e56c06570 - driver::driver::phase_4_translate_to_llvm::h2fa30f4b120cdb579Aq::v0.11.0.pre
21: 0x7f6e56bfd2b0 - driver::driver::compile_input::h1d313b682f9ead2bDeq::v0.11.0.pre
22: 0x7f6e56cca0c0 - driver::run_compiler::hcc8540f7b478ad28b0s::v0.11.0.pre
23: 0x7f6e56cc9fd0 - driver::main_args::closure.117522
24: 0x7f6e56cdf0f0 - task::TaskBuilder<S>::try_future::closure.118663
25: 0x7f6e56cded10 - task::TaskBuilder<S>::spawn_internal::closure.118640
26: 0x7f6e55d5c590 - task::spawn_opts::closure.7462
27: 0x7f6e55a5f290 - rust_try
28: 0x7f6e55a03500 - unwind::try::h800fde6f36f3558bBNd::v0.11.0.pre
29: 0x7f6e55a031e0 - task::Task::run::hf743f122a6385418XYc::v0.11.0.pre
30: 0x7f6e55d5c350 - task::spawn_opts::closure.7408
31: 0x7f6e55a05da0 - thread::thread_start::hd9510588dd47efddvld::v0.11.0.pre
32: 0x7f6e53311060 - start_thread
33: 0x7f6e556cd489 - __clone
34: 0x0 - <unknown>