Some misc changes

examples/example.rs

@@ -137,3 +137,8 @@ unsafe fn transmute(c: char) -> u32 {
 unsafe fn call_uninit() -> u8 {
     intrinsics::uninit()
 }
+
+// TODO: enable when fat pointers are supported
+/*unsafe fn deref_str_ptr(s: *const str) -> &'static str {
+    &*s
+}*/

src/abi.rs

@@ -330,7 +330,7 @@ pub fn codegen_call<'a, 'tcx: 'a>(
 
             let nil_ty = fx.tcx.mk_nil();
             let usize_layout = fx.layout_of(fx.tcx.types.usize);
-            let ret = return_place.unwrap();
+            let ret = return_place.expect("return place");
             match intrinsic {
                 "abort" => {
                     fx.bcx.ins().trap(TrapCode::User(!0 - 1));

src/base.rs

@@ -354,6 +354,10 @@ fn trans_stmt<'a, 'tcx: 'a>(
                     let res = match un_op {
                         UnOp::Not => fx.bcx.ins().bnot(val),
                         UnOp::Neg => match ty.sty {
+                            TypeVariants::TyInt(_) => {
+                                let zero = fx.bcx.ins().iconst(types::I64, 0);
+                                fx.bcx.ins().isub(zero, val)
+                            },
                             TypeVariants::TyFloat(_) => fx.bcx.ins().fneg(val),
                             _ => unimplemented!("un op Neg for {:?}", ty),
                         },