Update the function declarations with rust abi. A cdecl

fn write(int fd, rustrt.vbuf buf, uint count) -> int;

compiles to

declare i32 @Write(i32, i8*, i32)

and a rust

fn vec_buf[T](vec[T] v, uint offset) -> vbuf;

compiles to

declare i8* @vec_buf(%task*, %tydesc*, %"vec[<P0:2>]", i32)

which I think is the correct declaration for both :-)

Author: cixtor

src/comp/middle/trans.rs

@@ -513,7 +513,18 @@ fn type_of_fn(@crate_ctxt cx,
 fn type_of_native_fn(@crate_ctxt cx, ast.native_abi abi,
                      vec[ty.arg] inputs,
                      @ty.t output) -> TypeRef {
-    let vec[TypeRef] atys = type_of_explicit_args(cx, inputs);
+    let vec[TypeRef] atys = vec();
+    if (abi == ast.native_abi_rust) {
+        atys += T_taskptr(cx.tn);
+        auto t = ty.ty_native_fn(abi, inputs, output);
+        auto ty_param_count = ty.count_ty_params(plain_ty(t));
+        auto i = 0u;
+        while (i < ty_param_count) {
+            atys += T_ptr(T_tydesc(cx.tn));
+            i += 1u;
+        }
+    }
+    atys += type_of_explicit_args(cx, inputs);
     ret T_fn(atys, type_of_inner(cx, output));
 }