test: add compile-fail test for #[deriving(FromPrimitive)]

src/test/compile-fail/deriving-primitive.rs

@@ -0,0 +1,34 @@
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use std::num::FromPrimitive;
+use std::int;
+
+#[deriving(FromPrimitive)]
+struct A { x: int }
+//~^^ ERROR `FromPrimitive` cannot be derived for structs
+//~^^^ ERROR `FromPrimitive` cannot be derived for structs
+
+#[deriving(FromPrimitive)]
+struct B(int);
+//~^^ ERROR `FromPrimitive` cannot be derived for structs
+//~^^^ ERROR `FromPrimitive` cannot be derived for structs
+
+#[deriving(FromPrimitive)]
+enum C { Foo(int), Bar(uint) }
+//~^^ ERROR `FromPrimitive` cannot be derived for enum variants with arguments
+//~^^^ ERROR `FromPrimitive` cannot be derived for enum variants with arguments
+
+#[deriving(FromPrimitive)]
+enum D { Baz { x: int } }
+//~^^ ERROR `FromPrimitive` cannot be derived for enums with struct variants
+//~^^^ ERROR `FromPrimitive` cannot be derived for enums with struct variants
+
+fn main() {}